Updated on 2022/09/25

写真a

 
LIU, Jiang
 
Affiliation
Faculty of Science and Engineering, Global Center for Science and Engineering
Job title
Associate Professor

Concurrent Post

  • Faculty of Science and Engineering   Graduate School of Fundamental Science and Engineering

Research Institute

  • 2020
    -
    2022

    国際情報通信研究センター   兼任研究員

  • 2020
    -
    2022

    理工学術院総合研究所   兼任研究員

Education

  • 2006.04
    -
    2012.03

    Waseda University   Graduate School of Globe Information and Telecommunication Studies, Doctoral degree  

  • 2004.04
    -
    2006.03

    Waseda University   Graduate School of Globe Information and Telecommunication Studies, Master degree   Communication  

Degree

  • Waseda University   Master of Science in Global Information and. Telecommunication Studies

  • Waseda University   Doctor of Science in Global Information and Telecommunication Studies

Research Experience

  • 2017.09
    -
    Now

    Waseda University   Major in Computer Science and Communications, Global Center for Science and Engineering, Faculty of Science and Engineering   Associate Professor

  • 2014.04
    -
    2017.08

    Waseda University   International Center For Science and Engineering   Assistant Professor

  • 2012.04
    -
    2014.03

    Waseda University   Waseda Research Institute for Science and Engineering (WISE)   Junior Researcher

  • 2009.04
    -
    2012.03

    Waseda University   Graduate School of Globe Information and Telecommunication Studies   Research Assistant

Professional Memberships

  •  
     
     

    IET

  •  
     
     

    Institute of Electrical and Electronics Engineers

  •  
     
     

    The institute of Electronics, Information and Communication Engineers (IEICE)

 

Research Areas

  • Information network

Research Interests

  • wireless communication, optical communication

Papers

  • Performance Analysis of Intelligent Reflecting Surface-Assisted Orbital Angular Momentum-Based Communication Systems

    Kosei Ono, Kazutoshi Yoshii, Megumi Saito, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    International Conference on Advanced Communication Technology, ICACT   2022-February   7 - 12  2022

     View Summary

    Uniformed circular array antenna (UCA) based orbital angular momentum (OAM) communication system has some disadvantages, such as not being suitable for long-distance multiplexing and requiring a high degree of synchronization between the transmitting and receiving antennas. To achieve non-line-of-sight (NLoS) communication using OAM radio waves, we propose an inter-mode interference (IMI) cancellation method for intelligent reflecting surface (IRS)-Assisted OAM multiplexing to eliminate the IMI from all OAM modes. We also propose a L2-ba11 projection method to optimize the transmit power allocation for OAM modes to increase the system capacity of IRS-assisted OAM communication systems. The IMI cancellation method and the L2-ball projection method are shown to achieve increasing the maximum system capacity as compared to the L1-ball projection method when the IRS is located closer to the middle between the transmitter UCA and receiver UCA.

    DOI

  • Wearable Air-Writing Recognition System employing Dynamic Time Warping

    Yuqi Luo, Jiang Liu, Shigeru Shimamoto

    2021 IEEE 18th Annual Consumer Communications & Networking Conference (CCNC)    2021.01

    DOI

  • Wireless Power Transmission Scheme Employing Phase Control for WSN

    Genta Ishii, Megumi Saito, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    2021 IEEE 18th Annual Consumer Communications & Networking Conference (CCNC)    2021.01

    DOI

  • Energy Borrowing Transmission Scheme Based on D2D Communication for 5G Networks

    Megumi Saito, Takashi Koshimizu, Zhenni Pan, Jiang Liu, Hayato Nakazawa, Shigeru Shimamoto

    IEEE ACCESS   9   165841 - 165853  2021

     View Summary

    In our paper, we proposed an Energy Borrowing (EB) transmission scheme which is used to conserve the battery life of user equipment (UE), such as a mobile phone. EB is based on device-to-device (D2D) communication and cellular networks, particularly, on out-band D2D (Wi-Fi Direct, IEEE 802.11) and 5G networks. Since D2D offers higher energy efficiency than cellular networks, in this scheme, a UE with low remaining battery power establishes a D2D connection with a nearby UE, and the nearby UE transfers the low remaining battery UE's packets to/from gNB (5G-base station). As nearby UE plays an active role in the low remaining battery UE's connection with gNB. Therefore, we can rephrase that a UE with low battery power is virtually borrowing the battery resources of a nearby UE. This paper introduces the operation protocol and procedure followed by EB with the use of Wi-Fi Direct and 5G networks. Experiments and simulations demonstrate that EB can extend terminal battery lifetime (a valuable characteristic for long-lasting batteries), and it is more effective as compared with the existing scheme that uses only the cellular network.

    DOI

  • Radio and Power over Fiber System for 4K/8K Satellite Antenna

    Ziyu Guo, Jiang Liu, Shigeru Shimamoto

    2020 IEEE International Conference on Communication, Networks and Satellite (Comnetsat)    2020.12

    DOI

  • Robotic inner signal propagation and random access over hybrid access scheme

    Md Abir Hossain, Zhenni Pan, Megumi Saito, Jiang Liu, Shigeru Shimamoto

    International Journal of Computer Networks and Communications   12 ( 4 ) 71 - 89  2020.07

     View Summary

    This paper proposes a Hybrid Access Scheme (HAS) aiming to convert a future robot's backend communication system by a finite number of sensors instead of using a lot of wires. To replace this communication, the HAS needs to assure higher reliability within stringent low latency packet transmission. In this paper, the HAS utilizes the packet diversity principle and forward multiple copies of the same packet over the massive number of subcarrier channels. The HAS assigns the random accessing to select a subcarrier channel for general packet transmitting sensors. The audio and video sensors transmit packets over the dedicated channels to avoid collisions. The HAS system allows transmitting audio, video and general sensors simultaneously. The minimum number of subcarriers to satisfy the URLLC reliability requirement of 99.999% is evaluated for different packet duplications over different arrival condition. The HAS system's reliability and collision probability are evaluated in MATLAB simulator for different packet duplication over different arrival condition. Moreover, the signal propagation expressions are captured using ANSYS HFSS software for rectangular and circular transmission medium over the 900 MHz, 2.4 GHz, 24 GHz, and 55 GHz frequency bands for different structural configurations.

    DOI

  • Power Control Based on Multi-Agent Deep Q Network for D2D Communication

    Shi Gengtian, Takashi Koshimizu, Megumi Saito, Pan Zhenni, Liu Jiang, Shigeru Shimamoto

    2020 International Conference on Artificial Intelligence in Information and Communication (ICAIIC)    2020.02

    DOI

  • Phase Control Scheme to Reduce Ionospheric Fading for Long Distance HF Communication

    Kazutoshi Yoshii, Megumi Saito, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    12TH WIRELESS DAYS CONFERENCE (WD 2021)    2020

     View Summary

    The dynamic phase control system for the stable long distance high frequency (HF) communication is evaluated in this paper by the ionospheric propagation simulations. The radio wave in HF band reaches to the very far side on the Earth by ionospheric propagation. It is efficacious to low latency long distance communication and emergency communication, but the ionospheric propagation is the cause of a phase fluctuation and power attenuation, the affects lead to ionospheric fading that is the sharp drop of the received power. We have reproduced the HF band propagation in a computer simulation and calculated the received power at the receiving station. The results show the improvement of the received power and fading reduction by the appropriate phase control at transmission station.

    DOI

  • Non-invasive Blood Glucose Measurement Based on mid-Infrared Spectroscopy

    Yang Chen, Jiang Liu, Zhenni Pan, Shirgeru Shimamoto

    2020 IEEE 17th Annual Consumer Communications & Networking Conference (CCNC)    2020.01

    DOI

  • A Triple-Band Antenna Loaded with Reflector Surface for WLAN and 5G Applications

    Tengfei Hu, Zhenni Pan, Megumi Saitou, Jiang Liu, Shigeru Shimamoto

    Journal of Communications     729 - 734  2020

     View Summary

    In this paper, a novel triple-band antenna with reflector surface which has the property of both artificial magnetic conductor (AMC) surface and perfect electric conductor (PEC) for WLAN and Sub-6G 5G applications is proposed. The presented antenna is composed of two parts: the AMC surface and the microstrip-fed printed dipole. Baluns are used to excite the dipoles. This antenna design combines the advantages of AMC and PEC. In lower band and middle band, the inserted board works as AMC surface. This AMC surface can help the antenna to achieve unidirectional radiation pattern and low-profile characteristics. While at upper band the antenna works as PEC surface. PEC surface increases the gain of the antenna in upper band. As a result, the proposed antenna can offer an impedance band from 2.39 GHz to 2.63 GHz and from 3.61 GHz to 3.72 GHz and from 5.61 GHz to 5.84 GHz when the S11 is less than - 10dB. Stable radiation patterns with peak gain of 5.6 dBi, 6.5 dBi and 9.6 dBi are obtained in lower band, middle band and upper band, respectively. The proposed antenna can be used for multiband base stations for WLAN and 5G applications.

    DOI

  • Multi-Dimensional Affinity Propagation Clustering Applying a Machine Learning in 5G-Cellular V2X

    Takashi Koshimizu, Shi Gengtian, Huan Wang, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    IEEE Access   8   94560 - 94574  2020

    DOI

  • Multiband Massive Channel Random Access in Ultra-Reliable Low-Latency Communication

    Abir Hossain, Zhenni Pan, Megumi Saito, Jiang Liu, Shigeru Shimamoto

    IEEE Access   8   81492 - 81505  2020

    DOI

  • Design of Ultrasonic Wireless Power Transfer System

    Kensuke Nagaya, Jiang Liu, Shigeru Shimamoto

    2019 IEEE Globecom Workshops (GC Wkshps)    2019.12

    DOI

  • Prediction of Ionospheric Fading for Long Distance Emergency Communication

    Kazutoshi Yoshii, Megumi Saitou, Jiang Liu, Shigeru Shimamoto

    2019 IEEE International Conference on Communications Workshops (ICC Workshops)    2019.05

    DOI

  • PPCS: A Progressive Popularity-Aware Caching Scheme for Edge-Based Cache Redundancy Avoidance in Information-Centric Networks.

    Quang Ngoc Nguyen, Jiang Liu, Zhenni Pan, Ilias Benkacem, Toshitaka Tsuda, Tarik Taleb, Shigeru Shimamoto, Takuro Sato

    Sensors (Basel, Switzerland)   19 ( 3 )  2019.02  [International journal]

     View Summary

    This article proposes a novel chunk-based caching scheme known as the Progressive Popularity-Aware Caching Scheme (PPCS) to improve content availability and eliminate the cache redundancy issue of Information-Centric Networking (ICN). Particularly, the proposal considers both entire-object caching and partial-progressive caching for popular and non-popular content objects, respectively. In the case that the content is not popular enough, PPCS first caches initial chunks of the content at the edge node and then progressively continues caching subsequent chunks at upstream Content Nodes (CNs) along the delivery path over time, according to the content popularity and each CN position. Therefore, PPCS efficiently avoids wasting cache space for storing on-path content duplicates and improves cache diversity by allowing no more than one replica of a specified content to be cached. To enable a complete ICN caching solution for communication networks, we also propose an autonomous replacement policy to optimize the cache utilization by maximizing the utility of each CN from caching content items. By simulation, we show that PPCS, utilizing edge-computing for the joint optimization of caching decision and replacement policies, considerably outperforms relevant existing ICN caching strategies in terms of latency (number of hops), cache redundancy, and content availability (hit rate), especially when the CN's cache size is small.

    DOI PubMed

  • Non-invasive Glucose Measurement Based on Ultrasonic Transducer and Near IR Spectrometer

    Yanan Gao, Yukino Yamaoka, Yoshimitsu Nagao, Jiang Liu, Shigeru Shimamoto

    Lecture Notes in Electrical Engineering     33 - 40  2019

    DOI

  • Detections of pulse and blood pressure employing 5G millimeter wave signal

    Yukino Yamaoka, Jiang Liu, Shirgeru Shimamoto

    2019 16th IEEE Annual Consumer Communications & Networking Conference (CCNC)    2019.01

    DOI

  • $P$ -Persistent Energy-Aware Handover Decisions Employing RF Fingerprint for Adaptive-Sized Heterogeneous Cellular Networks

    Zhenni Pan, Megumi Saito, Jiang Liu, Shigeru Shimamoto

    IEEE Access   7   52929 - 52944  2019

    DOI

  • MMLPA: Multilayered Metamaterial Low Profile Antenna for IoT Applications

    Tojoarisoa Rakotoaritina, Megumi Saito, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    Journal of Advanced Simulation in Science and Engineering   6 ( 1 ) 273 - 281  2019

    DOI

  • Energy splitting for swipt in Qos-constraint MTC network: A non-cooperative game theoretic approach

    Kang Kang, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    International Journal of Computer Networks and Communications   10 ( 5 ) 105 - 116  2018.09

     View Summary

    This paper studies the emerging wireless energy harvesting algorithm dedicated for machine type communication (MTC) in a typical cellular network where one transmitter (e.g. the base station, a hybrid access point) with constant power supply communicates with a set of users (e.g. wearable devices, sensors). In the downlink direction, the information transmission and power transfer are conducted simultaneously by the base station. Since MTC only transmits several bits control signal in the downlink direction, the received signal power can be split into two parts at the receiver side. One is used for information decoding and the other part is used for energy harvesting. Since we assume that the users are without power supply or battery, the uplink transmission power is totally from the energy harvesting. Then, the users are able to transmit their measured or collected data to the base station in the uplink direction. Game theory is used in this paper to exploit the optimal ratio for energy harvesting of each user since power splitting scheme is adopted. The results show that this proposed algorithm is capable of modifying dynamically to achieve the prescribed target downlink decoding signal-to-noise plus interference ratio (SINR) which ensures the high reliability of MTC while maximizing the uplink throughput.

    DOI

  • Wearable Devices Downlink and Uplink Transmission in Multi-hop HetNet based on Full-Duplex Cooperative Network

    Rong Ye, Kang Kang, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    International Conference on Mobile and Wireless Technology     74 - 86  2018.06  [Refereed]

  • Traffic-Aware Energy Optimizing Strategies for Multi-Cell Coordinated Green Cellular Networks

    Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    IEEE Transactions on Green Communications and Networking   2 ( 2 ) 418 - 431  2018.06

    DOI

  • Normalized multi-dimensional parameter based affinity propagation clustering for cellular V2X

    Takashi Koshimizu, Huan Wang, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    2018 IEEE Wireless Communications and Networking Conference (WCNC)    2018.04

    DOI

  • Fairness-aware hybrid resource allocation with cross-carrier scheduling for LTE-U system

    Yupu Dong, Zhenni Pan, Kang Kang, Jiang Liu, Shigeru Shimamoto, Ragil Putro Wicaksono, Seiji Kunishige, Kwangrok Chang

    Lecture Notes in Electrical Engineering   425   114 - 128  2018

     View Summary

    Recently, the 3rd Generation Partnership Project (3GPP) proposes to extend the Long Term Evolution Advanced (LTE-A) to the unlicensed spectrum, named Long Term Evolution Unlicensed (LTE-U), which enables LTE to operate in both the licensed band and the unlicensed band. In this paper, we consider how to make LTE-U get even higher throughput in the high traffic unlicensed band. In order to achieve this target, there is a big challenge to make LTE-U a good neighbor to the existing wireless communication technologies in the unlicensed band, such as WIFI system in the 5 GHz band. In our research, we assume two carriers aggregated, one is from licensed band, and the other is from unlicensed. We also define two kinds of frequency resources in the unlicensed band. One is the normal frequency resource that has not been utilized by the WIFI systems, and the other is the special frequency resource that has been utilized by the WIFI systems already. We propose a novel hybrid resource allocation algorithm by combining two different frequency sharing schemes (Underlay and Interweave) and apply different resource allocation algorithm to achieve higher throughput for all kinds of user equipment (UE) from LTE-U when the WIFI system’s traffic is heavy. We also consider the fairness for all UEs from LTE-U system and guarantee that the interference to the WIFI UEs (WUEs) is acceptable.

    DOI

  • Novel UE RF condition estimation algorithm by integrating machine learning

    Yupu Dong, Zhenni Pan, Mohamad Erick Ernawan, Jiang Liu, Shigeru Shimamoto, Ragil Putro Wicaksono, Seiji Kunishige, Kwangrok Chang

    Lecture Notes in Electrical Engineering   425   102 - 113  2018

     View Summary

    By 2020, 5G era will be commercially available. The smart city construction will also make great progress. Compared to current situation, more than thousand times of devices will connect to the cellular networks. For the operators, in order to analyze overall network performance, it is a key factor to estimate the user equipment (UE) radio frequency (RF) condition. However, practical RF estimation scheme is based on UE data log which can only observe UE that is at the top-serving cell with good RF condition. However, according to the comparison of actual UE data log and the scanner data log, potential RF problems may still exist since the UE will not always be served by the top-1 cell. In this paper, we propose a novel estimation scheme by integrating machine learning (ML) algorithm to analyze the scanner data logs from the target estimation zones where the mobility problems may occur. A hypothesis is obtained from learning step by various kinds of RF condition as input features. The numerical results show that the proposed estimation algorithm integrated ML can estimate probability of the potential mobility problems accurately.

    DOI

  • Full-Duplex Wireless Powered IoT Networks

    Kang Kang, Rong Ye, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    IEEE ACCESS   6   53546 - 53556  2018

     View Summary

    This paper studies the emerging wireless power transfer for the Internet-of-Things (IoT) network, where one hybrid access point (H-AP) with constant power supply communicates with a set of IoT devices. This H-AP is assumed to work in a full-duplex mode, which transmits/receives signals to/from these IoT devices simultaneously during the whole frame. The IoT devices are capable of harvesting energy from the received signals broadcast by the H-AP. And the harvested energy is used to support the uplink transmission. Since time-division multiple access is used in uplink transmission, one IoT device keeps harvesting energy till its own uplink time slot. The objective of this paper is to maximize the total surplus energy, which is defined as the gap between available energy and consumed energy for uplink transmissions, by exploiting the optimal time allocation scheme for each device. A distributed non-cooperative and a bargaining cooperative game-based algorithms are proposed to solve this problem. In addition, the well-known KKT condition approach is adopted as a comparison. The numerical results show that the bargaining cooperative algorithm outperforms the distributed non-cooperative algorithm (DNCA) and KKT algorithm (KKTA) in terms of total surplus energy and fairness index. The performance of DNCA is better than that of KKTA in terms of total surplus energy while KKTA is fairer than DNCA.

    DOI

  • 3D radio signal visualization employing drone

    Ryota Hagiwara, Hikari Inata, Yukihiko Okouchi, Jiang Liu, Shigeru Shimamoto

    2018 15th IEEE Annual Consumer Communications & Networking Conference (CCNC)    2018.01

    DOI

  • A Game Theory Based Power Control Algorithm for Future MTC NOMA Networks

    Kang Kang, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    2017 14TH IEEE ANNUAL CONSUMER COMMUNICATIONS & NETWORKING CONFERENCE (CCNC)     203 - 208  2017

     View Summary

    In this paper, we propose a power control algorithm dedicated for machine type communications (MTC) in future non-orthogonal multiple access (NOMA) networks employing game theory. In MTC networks, communication reliability should be considered prior to power consumption or energy efficiency. Once the reliability is satisfied, discussions about power consumption makes sense. We build a cost function for each device based on a non-cooperative game model. The cost function reflects the power consumption as well as received signal-to-interference plus noise ratio (SINR) of each device. Since we assume the devices are battery-driven, the objective is to minimize the power consumption as much as possible provided that the received SINR of each device is kept beyond an acceptable level so that the reliability can be guaranteed. We derive the power control algorithm function and prove the convergence of this iteration algorithm and the unique existence of Nash equilibrium as well. The simulation results show that under the same constraints of maximum power consumption and minimum acceptable SINR, the proposed algorithm outperforms the conventional algorithms in terms of power consumption and power efficiency.

  • Game-Theory-Based Distributed Power Splitting for Future Wireless Powered MTC Networks

    Kang Kang, Rong Ye, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    IEEE ACCESS   5   20124 - 20134  2017

     View Summary

    This paper studies the emerging wireless power transfer for machine type communication (MTC) network, where one hybrid access point (AP) with constant power supply communicates with a set of users (i.e., wearable devices and sensors) without power supply. The information and energy are transferred simultaneously in downlink direction. For MTC networks, most devices only receive several bits control data from AP in downlink transmission. So it is possible to utilize part of the received power to execute energy harvesting provided that the transmission reliability is guaranteed. Since we assume that all devices are without power supply or battery, the power of uplink transmission is entirely from energy harvesting. After converting electromagnetic wave to electricity, the devices are able to transmit their measured and collected data in uplink. Based on these considerations, a non-cooperative game model is formulated and a utility function involving both downlink decoding signal to noise ratio (SNR) and uplink throughput is established. The existence of Nash equilibrium (NE) in the formulated game model is proved. The uniqueness of NE is discussed and the expected NE is selected based on fairness equilibrium selection mechanism. The optimal splitting ratio within the feasible set, which maximizes the utility function, is obtained by an iterative function derived from this utility function. The numerical results show that in addition to ensuring the downlink decoding SNR and maximizing uplink throughput of an individual device, our proposed algorithm outperforms the conventional algorithm in terms of system performance.

    DOI

  • Cooperative Traffic Light Controlling Based on Machine Learning and a Genetic Algorithm

    Huan Wang, Jiang Liu, Zhenni Pan, Koshimizu Takashi, Shigeru Shimamoto

    2017 23RD ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC): BRIDGING THE METROPOLITAN AND THE REMOTE     258 - 263  2017

     View Summary

    In this paper, a cooperative traffic light controlling algorithm for urban road network aiming at reducing traffic congestion is proposed. Dedicated Short Range Communications (DSRC) is applied to detect the real time traffic flow. Based on the traffic flow at the current traffic light cycle and the historical data, we use machine learning technique to predict the variation of the traffic flow at the next traffic light cycle. With the purpose of reducing the road network's average waiting time and balancing the traffic pressure between different intersections, the traffic light control system adjusts the timing plan cooperatively. The genetic algorithm is used to calculate the optimum traffic light timing plan. In addition, a novel state transition model of the road network for dynamic numerical simulation is utilized to verify the effectiveness of the proposed algorithm. According to a 4-nodes road network simulation result, the vehicles in the traffic flow with congestion problems will have a shorter waiting time while the vehicle in the other traffic flows will have an increased waiting time. More importantly, the average waiting time of the road network declines.

  • Partnership and Data Forwarding Model for Data Acquisition in UAV-aided Sensor Networks

    Sotheara Say, Hikari Inata, Mohamad Erick Ernawan, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    2017 14TH IEEE ANNUAL CONSUMER COMMUNICATIONS & NETWORKING CONFERENCE (CCNC)     933 - 938  2017  [Refereed]

     View Summary

    This paper explores a cooperative partnership and data forwarding model in wireless sensor networks using unmanned aerial vehicle (UAV) with the goal of enhancing the data collection efforts. A UAV-based data acquisition architecture is presented to suppress the limitations of the traditional wireless sensor network. For this, we introduce a flexible and fast approach to collect data by taking into consideration the mobility of the mobile sink (UAV) and sensor nodes in the network. In other words, leveraging the mobility of the UAV and the location of sensor nodes, we adopt a novel frame selection technique that classifies sensor nodes into different frames. Then we present a cooperative partnership model that allows sensor nodes in the network to individually pair with their peers and thus transmitting data simultaneously. We also aim to alleviate the packet loss originated from certain sensor nodes located in the rear edge-side of the UAV's coverage area. This situation happens when the UAV is moving in the forward direction while collecting data. Thus, to alleviate these packet losses while guaranteeing a higher success rate of packet reception ratio, we propose a novel data forwarding scheme to closely integrate with the aforementioned partnership model. We conduct simulations to verify our proposed framework, and results show huge performance gain is obtained over the traditional data collection technique.

  • Priority-Based Data Gathering Framework in UAV-Assisted Wireless Sensor Networks

    Sotheara Say, Hikari Inata, Jiang Liu, Shigeru Shimamoto

    IEEE SENSORS JOURNAL   16 ( 14 ) 5785 - 5794  2016.07  [Refereed]

     View Summary

    This paper proposes a novel data acquisition framework in sensor networks using an unmanned aerial vehicle (UAV) with the goal of increasing the efficiency of the data gathering efforts. To maximize the system throughput, we introduce a priority-based frame selection scheme to suppress the number of redundant data transmissions between sensor nodes and the UAV. Toward this goal, we classify the nodes inside the UAV's coverage area into different frames according to their locations. Taking advantage of the mobility of the UAV, we assign different transmission priorities to nodes in different frames. To do that, we introduce an adjustment to the contention window value used in IEEE 802.11 MAC, thereby defining a lower contention window range to the frame with higher priority ( urgent area) and a higher contention window range to the frame with lower priority ( less important area). The proposed framework leads to a reduction in packet collisions and, at the same time, minimizes the packet loss originated from nodes in the rear-side of the UAV when the UAV moves in the forward direction. To optimize the networks' energy consumption, we present a novel routing protocol based on the aforementioned framework. By leveraging the proposed framework and routing algorithm, we aim to reduce the transmission distances between senders and receivers. A shorter distance leads to better channel quality and energy savings, as is verified by our simulation studies and results.

    DOI

  • Train Ticket Gate System employing Optical Wireless Communications

    Khourn Khemry, Liu Jiang, Shigeru Shimamoto

    2016 13TH IEEE ANNUAL CONSUMER COMMUNICATIONS & NETWORKING CONFERENCE (CCNC)    2016  [Refereed]

     View Summary

    This paper presents a novel ticket gate system employing optical wireless communication used at a train station in Japan. The proposed system needs two optical wireless card readers attached to two inner sides of the gate. According to our study, we found that the proposed system has higher received power compared to the conventional train ticket gate system. It also has higher probability of success as long as the communication distance is less than 0.28 meters. As a result, the proposed system has a better performance compared to the conventional one and its availability is guaranteed.

  • BS-6-24 POSITION ACCURACY FOR INDOOR LOCALIZATION SYSTEM EMPLOYING VISIBLE LIGHT COMMUNICATION(BS-6.Network and service Design, Control and Management)

    Khourn Khemry, Liu Jiang, Shimamoto Shigeru

    Proceedings of the Society Conference of IEICE   2015 ( 2 ) "S - 61"-"S-62"  2015.08

    CiNii

  • Adjustable Energy Consumption Access Scheme for Satellite Cluster Networks

    Lilian del Consuelo Hernandez Ruiz Gaytan, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    IEICE TRANSACTIONS ON COMMUNICATIONS   E98B ( 5 ) 949 - 961  2015.05  [Refereed]

     View Summary

    Satellite clusters have been satisfactorily implemented in a number of applications, such as positioning and sensor networks, with the purpose of improving communication system capabilities. However, because the use of clusters requires good management of the resources, those solutions imply new challenges for communication systems. This paper focuses on improving the data management between network elements by considering a network formed by satellite clusters. Satellite clusters work in cooperation to provide real-time and non-real-time services in different footprint areas. This study proposes the adjustable energy consumption access scheme (AECS) as one possible solution response to particular necessities of communication and at the same time, as a way of decreasing the system energy consumption. Energy consumption is a key issue that concerns green network operations and it is directly linked to the cooperation and coordination between network elements. On the other hand, we support the implementation of Optical Inter-Satellite Links (OISL) for communication between cluster elements. The analysis involves the study of energy consumption, transmission delay, specific link margins, bit error rate (BER) and QoS.

    DOI

  • (21) A Fellowship Experience in Japan : An island nation 3,600 km away from home(RIKEJO, Be Radiant!; Rooters' songs for science/engineering girls)

    Liu Jiang

    The journal of the Institute of Image Information and Television Engineers   69 ( 5 ) 462 - 463  2015.05

    CiNii

  • BS-3-34 Off Loading based Global LEO Satellite Network employing Adaptive Beam Forming(BS-3. Advanced Technologies in the Design, Management and Control for Future Innovative Communication Network)

    Numakami Akira, Gaytan Lilian del Consuelo Hernandez Ruiz, Nuon Chandarong, Liu Jiang, Shimamoto Shigeru

    Proceedings of the IEICE General Conference   2015 ( 2 ) "S - 72"-"S-73"  2015.02

    CiNii

  • Study of Rule-based Autonomous Control Method for M2M Gateway Collaboration

    IPSJ SIG Notes   2015 ( 36 ) 1 - 5  2015.02

     View Summary

    The traditional feedback control method of server-centric M2M system, comprising a massive number of sensors and actuators, faces some issues on control delay and control conflict. In this paper, we propose a rule-based autonomous control method for solving these problems. The proposed method controls the actuator autonomously to avoid the control delay and control conflict based on the control rules composed of the triggers and actions. By employing this method, M2M gateways can be cooperated with each other autonomously, without the server controls. We build a prototype of autonomous distributed cooperative M2M system based on the proposed method. The result shows that the proposed method is effective and practical for the large-scale M2M systems.

    CiNii

  • BS-1-4 Unmanned Aerial Vehicle based Missing People Detection System employing Phased Array Antenna

    Ando Taisuke, Aomi Naoto, Inata Hikari, Liu Jiang, Shimamoto Shigeru

    Proceedings of the IEICE General Conference   2015 ( 1 ) "S - 7"-"S-8"  2015.02

    CiNii

  • Study of Event-driven Data Collection Method for M2M Distributed Cooperative M2M System

    IPSJ SIG Notes   2015 ( 35 ) 1 - 5  2015.02

     View Summary

    The data collection over the traditional server-centric M2M systems face issues on its network load and cost of data storage. Besides, collision of data access to the same sensor among multiple applications must be avoided. To solve above problems, we propose a data collection method based on event driven architecture. This method limits the data uploads which are triggered only by pre-defined events such as overly large values and/or immediate changes detected on M2M gateways. Moreover, the collision of data access is resolved by integrating of data collection rules. The prototype of autonomous distributed system of cooperative M2M has been developed and tested. It is demonstrated that the proposed method is effective and practical for the large-scale M2M systems.

    CiNii

  • Dynamic Scheduling for High Throughput Satellites Employing Priority Code Scheme

    Lilian Del Consuelo Hernandez Ruiz Gaytan, Zhenni Pan, Jiang Liu, Shigeru Shimamoto

    IEEE ACCESS   3   2044 - 2054  2015

     View Summary

    Based on the use of multi-beams, high throughput satellites (HTSs) provide high data rates to a large number of users. In this context, the distribution of frequency resources among multi-beams plays an important role. This is because unsuitable distributions might cause the wastage or the starvation of frequencies and bring about low throughput rates. This paper proposes a solution to mitigate the unsuitable allocations of frequency resources in an HTS. The solution is the priority code scheme (PCS), which seeks to respond to users' demands by dynamically scheduling frequency resources for precise satellite footprint areas. The key is to assign a priority code and an efficiency indicator to every multi-beam deployed on the system. The PCS algorithm involves the association of the efficiency indicator with the bandwidth utilization per beam to detect and correct arbitrary bandwidth allocations among the beams. Due to the PCS's cyclical repetition of its algorithm, the concurrence time of the scheme and the tardiness of the algorithm form part of the evaluation of the PCS. Furthermore, we support the implementation of the frequency-reuse process to enhance the exploitation of frequency resources. To evaluate the PCS performance, the analysis delves into the study of the bandwidth utilization, the interference among beams, the concurrence time, and the algorithm tardiness.

    DOI

  • Cooperative Access among UEs in Cellular Networks

    Megumi Saito, Li Xiwen, Zhenni Pan, Liu Jiang, Shigeru Shimamoto

    PROCEEDINGS OF THE 2015 INTERNATIONAL CONFERENCE ON COLLABORATION TECHNOLOGIES AND SYSTEMS     434 - 440  2015  [Refereed]

     View Summary

    This paper proposes the Piggyback schemes between each User Equipment (UE) in cellular networks. This scheme is able to reduce a communication traffic volume of base station by each UE cooperates with other one. Therefore, it can make a smaller load in base station. Each UE establishes an independent connection and communication in current mobile network. When a UE accesses a base station, the UE receive data from other UEs nearby by device-to-device communication and the UE sends its own uplink data with the received data in this proposed method. We name the method a "Piggyback scheme". Here we introduce two methods; one is "real-time active calling based piggyback scheme". The calling UE receives uplink data from other UEs and the UE sends the data in free white space of its own real-time active call channel while using call function in this scheme. The second one is "Data aggregation piggyback scheme". In this scheme, when the UE sends its own uplink data to base station, the UE informs that it can piggyback execute for nearby UEs, and the UE receives data from the nearby UEs. And the UE sends data that includes its own and other's data. And piggyback request UEs use broadcast scheme in searching piggyback execution UE and it choice the best condition piggyback execution UE every time with plural evaluation criteria. In this paper, we confirm that performances of the proposed schemes have an effect on the load reduction of cellular network as it has been shown in the simulations.

  • Adjustable Energy Consumption Access Scheme for Satellite Cluster Networks

    HERNANDEZ RUIZ GAYTAN Lilian, del Consuelo, PAN Zhenni, LIU Jiang, SHIMAMOTO Shigeru

    IEICE Trans. Commun.   98 ( 5 ) 949 - 961  2015

     View Summary

    Satellite clusters have been satisfactorily implemented in a number of applications, such as positioning and sensor networks, with the purpose of improving communication system capabilities. However, because the use of clusters requires good management of the resources, those solutions imply new challenges for communication systems. This paper focuses on improving the data management between network elements by considering a network formed by satellite clusters. Satellite clusters work in cooperation to provide real-time and non-real-time services in different footprint areas. This study proposes the adjustable energy consumption access scheme (AECS) as one possible solution response to particular necessities of communication and at the same time, as a way of decreasing the system energy consumption. Energy consumption is a key issue that concerns green network operations and it is directly linked to the cooperation and coordination between network elements. On the other hand, we support the implementation of Optical Inter-Satellite Links (OISL) for communication between cluster elements. The analysis involves the study of energy consumption, transmission delay, specific link margins, bit error rate (BER) and QoS.

    CiNii

  • Investigation on visible light communication system using OLED with dimming support

    Pham Quang Thai, Nguyen Xu Lin, Shimamoto Shigeru, Jiang Liu, Zhong Wende

    2015 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC)   2016-January   434 - 438  2015  [Refereed]

     View Summary

    In this paper, a visible light communications (VLC) system prototype using organic light emitting diode (OLED) with dimming support was realized and tested. Frequency response and driving range of OLED were measured and discussed. Considering practical applications of OLED, variable pulse position modulation (VPPM) signal was used to support data transmission under dimming condition. Our prototype was able to transmit up to 85 kbps data rate using an OLED with only 7 kHz 3 dB modulation bandwidth. For the target BER = 10(-3) with FEC, the luminous flux could be varied within 5-8 lm.

    DOI

  • 127.5 kbps transmission using OLED with 7 kHz 3dB modulation bandwidth in visible light communication system

    Pham Quang Thai, Nguyen Trung Thanh, Shimamoto Shigeru, Jiang Liu, Zhong Wende

    2015 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC)   2016-January   389 - 393  2015  [Refereed]

     View Summary

    In this paper, a visible light communications (VLC) system prototype using OLED was realized and tested. Using simple DPPM technique and comparator, our prototype was able to transmit up to 127.5 kbps data rate using an OLED with only 7 kHz 3 dB modulation bandwidth. Exploiting the frequency response of OLED, we were able to achieve a better data rate to modulation bandwidth ratio than other recent reports using OLED for VLC.

    DOI

  • Energy-sensitive Handoff Scheme Employing RF Fingerprint For Cell Sizing Based Heterogeneous Cellular Networks

    Pan Zhenni, Saito Megumi, Liu Jiang, Shimamoto Shigeru

    Technical report of IEICE. RCS   113 ( 456 ) 145 - 150  2014.02

     View Summary

    The energy optimization in small cell involved heterogeneous networks has been considered as an emerging topic which enables a balance between the power consumption and capacity issues. In this paper, we propose an energy-sensitive handoff scheme for mobile macro user equipment (MUE) in the sleep mode involved cell sizing based macro-femto two-tier networks. The proposed scheme aims at achieving high handoff stability with low MUE power consumption by dynamically scheduling the mobile MUEs switch to the expandable indoor femto access point (FAP) and active macro base station (MBS) with a variable probability. The unique RF fingerprint (RFF) based localization is employed to provide energy-efficient small-cell detection with a flexible matching region. The transmit power of the MUEs for FAP sensing can be adaptively adjusted refer to the instantaneous traffic loads and reference location. Comprehensive evaluations are conducted with a tradeoff and show our proposed scheme has a positive influence on obtaining energy-efficient and QoS satisfiable handoff strategy in the macro-femto two-tier scenarios.

    CiNii

  • Neuron Control-Based Power Adjustment Scheme for Sleep Two-tier Cellular Networks

    Zhenni Pan, Megumi Saitou, Jiang Liu, Shigeru Shimamoto

    2014 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)     3201 - 3206  2014

     View Summary

    This paper proposes a self-optimizing based energy efficient scheme with a dynamic coverage expansion of femtocells in the macro-femto two-tier networks. High SINR and low power consumption can be benefited by coordinating downlink cross tier interference and intra-interference with a neuron control based adaptive power adjustment when sleep mode is involved in the macro base station (MBS). Moreover, by allowing open access in the hybrid femtocells, more near-indoor macro user equipments (MUEs), especially located around the edge of the macrocell can be served by indoor femto access point (FAP), which results in MBS having more of a probability to maintain sleep mode when the traffic is low. Many related performances are evaluated with a comparison of utility-based power control (UBPC) scheme, the energy impact of both MBS and FAP can be largely improved with optimal transmit power, which means the sleep mode technology can be enhanced, as shown in the simulation.

  • A subcarrier modulation based optical wireless communication system employing transmission diversity

    Jiang Liu, Mianxiong Dong, Laurence T. Yang, Shigeru Shimamoto

    JOURNAL OF SUPERCOMPUTING   66 ( 3 ) 1306 - 1319  2013.12  [Refereed]

     View Summary

    In this paper, we propose an optical wireless communication service for indoor environment. To seamlessly cover the target area and keep the received signal power strength at an acceptable level, we send the signal from multiple diffused optical emitters and achieve possible transmit diversity. With the proposed diversity scheme, the effective coverage range of the proposed system can be significantly enlarged with a guaranteed BER performance. Simulation results show a 13.4 m(2) area can be effectively covered by two optical emitters with optical emitter spacing of 3 m and average transmit optical power of 28 dBm.

    DOI

  • BI-2-13 The Study of Missing People Detection System employing UAV

    Oh Woojin, Aso Kento, Zhou Muye, David Donald Mrema, Liu Jiang, Shimamoto Shigeru

    Proceedings of the IEICE General Conference   2013 ( 1 ) "SS - 83"-"SS-84"  2013.03

    CiNii

  • A cross-layer security scheme of web-services-based communications for IEEE 1451 sensor and actuator networks

    Jun Wu, Ming Zhan, Bin Duan, Jiang Liu

    International Journal of Distributed Sensor Networks   2013  2013

     View Summary

    IEEE 1451 standard has been proposed to provide a common communication interface and transducer electric data sheet format for wired and wireless distributed applications in smart transducers (sensors and actuators). Currently, a unified Web service for IEEE 1451 smart transducers is a must. However, ensuring the security of web-services-based communications for IEEE 1451 smart transducers is an unsolved problem. In this paper, we proposed a cross-layer security mechanism that deals with the requirements of authentication, integrity, confidentiality, and availability across the communication process in IEEE 1451 smart transducers. The scheme contains three cross-layer components logically, including XML Encryption and Signature, SOAP Security Extension, and Web Services Description Language (WSDL) Security Checking. The former two components satisfy the requirements of confidentiality, availability, integrity, authentication, nonrepudiation, and freshness. The third component satisfies the requirement of availability, which can protect the system against denial-of-service (DoS) attack. The three cross-layer security components are integrated seamlessly in our scheme. To evaluate the overhead, we perform tests to evaluate the effect of message size on the performance of the access inquiry web service. The result supports the usefulness and feasibility of our scheme. © 2013 Jun Wu et al.

    DOI

  • Impact of Light Reflection on Indoor Wireless Optical CDMA Systems

    Jiang Liu, Zhenni Pan, Wasinee Noonpakdee, Shigeru Shimamoto

    JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING   4 ( 12 ) 989 - 996  2012.12  [Refereed]

     View Summary

    We present a study on evaluating the effects of multipath dispersion on indoor optical code division multiple access (CDMA) systems over optical wireless communication. The indoor propagation channel model which takes multiple reflecting surfaces into account is addressed. Theoretical analysis of the pulse response of direct light and reflected light is given. The bit error rate (BER) of this system is analyzed considering reflected light, background light, avalanche photo-diode noise, thermal noise, and multi-user interference. The results prove that the BER of the system is influenced by reflected light and that the effect of reflected light is related to room size and receiver position. With an increase in the number of users, the effect of reflected light becomes stronger and is a significant source of inter-symbol interference. It becomes clear that when optical CDMA is used in an indoor optical wireless system, the effect of reflected light is a key issue to be considered.

    DOI

  • Performance analysis of image sensor communication over free space optical channel

    Jiang Liu, Zhenni Pan, Shigeru Shimamoto

    IST 2012 - 2012 IEEE International Conference on Imaging Systems and Techniques, Proceedings     627 - 632  2012

     View Summary

    This paper presents a free space visible light communication (VLC) system using an image sensor as a receiver to acquire position related timely information. Since the atmospheric turbulence affects the communication quality, the analysis of atmospheric turbulence is very important for designing a practical communication system. In this paper, the atmospheric turbulence channel is analyzed. The method of characterizing and quantifying the influence of atmospheric effect to image sensor communication is presented. The noise model of the system using CMOS image sensor as a receiver is given. Furthermore, the bit error probability of the system using OOK modulation considering atmospheric turbulence is studied. © 2012 IEEE.

    DOI

  • Experiment on Space and Time Division Multiple Access Scheme over Free Space Optical Communication

    Jiang Liu, Jin Sando, Shigeru Shimamoto, Chiemi Fujikawa, Kashiko Kodate

    IEEE TRANSACTIONS ON CONSUMER ELECTRONICS   57 ( 4 ) 1571 - 1578  2011.11  [Refereed]

     View Summary

    Developments in outdoor free space optical (FSO) communication between buildings using rooftop-mounted units are limited by Point-to-Point wireless links. We propose a space and time division multiple access scheme to perform Point-to-Multi-Point communication employing reflectors. A single reflector controlled by a stepping motor and an array of fixed reflectors are used. The reflection characteristics of the reflector are measured. The relationship characteristics between the static angle error of the stepping motor, the beam fluctuation, and the communication distance are demonstrated. The received optical powers are compared on using one or two reflectors while considering the angle of incidence at the surface of the reflector. Moreover, the received power, the bit error rate and the throughput of the experiment system are measured. In addition, the throughput characteristics of the proposal scheme are made clear by experiments. The result of the experiment shows that the new scheme can provide a low-cost and efficient method for Point-to-Multi-Point FSO communication(1).

  • Position-Based Diversity Transmission Scheme Employing Optical Wireless Communication

    Wasinee Noonpakdee, Jiang Liu, Shigeru Shimamoto

    IEEE TRANSACTIONS ON CONSUMER ELECTRONICS   57 ( 3 ) 1071 - 1078  2011.08  [Refereed]

     View Summary

    We propose a position-based diversity transmission scheme for indoor optical wireless communication. In our scheme, the I (in-phase) and Q (Quadrature) signal of QPSK (quaternary phase-shift keying) modulation are transmitted separately to obtain a secure position-based transmission. We analyze probability of error with different mode numbers of the radiation lobe of Lambertian source, and position of the transmitters to attain single or multiple secure area(s). To obtain different secured areas, TDMA (time-division multiple access) with adaptive transmitted power for each time slot is applied. According to analytical results, the signal can be demodulated correctly only in the specific area and high-level security for optical wireless communication systems can then be achieved. In our scheme, the probability that the intruders can get the correct signal is decreased 90%, compared to conventional QPSK.(1)

  • Evaluation of Reflected Light Effect for Indoor Wireless Optical CDMA System

    Jiang Liu, Wasinee Noonpakdee, Hiroshi Takano, Shigeru Shimamoto

    2011 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)     1688 - 1693  2011  [Refereed]

     View Summary

    This is a study on the effect of reflected light on optical code-division multiple-access (CDMA) system over indoor optical wireless communication (OWC). The indoor propagation channel model which takes multiple reflecting surfaces into account was addressed. Theoretical analysis of the pulse response of direct light and reflected light is given. Bit error rate (BER) of this system is analyzed considering reflected light, background light, avalanche photo-diode (APD) noise, thermal noise, and multi-user interference. The results prove that the BER of the system is influenced by the reflected light and the effect of reflected light is related to the room size and receiver position. With the increase of user number, the effect of reflected light becomes stronger and it is a significant source of inter-symbol interference. It becomes clear that when OCDMA is used to an indoor optical wireless system, the effect of reflected light is a key issue to be considered.

  • An Optical IM/DD Channel Based Relay Scheme for Indoor Healthcare Communication System

    Jiang Liu, Hiroshi Takano, Shigeru Shimamoto

    2009 6TH IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE, VOLS 1 AND 2     808 - 812  2009  [Refereed]

     View Summary

    This paper presents a wireless relay scheme for indoor healthcare communication system, in which an optical relay link, instead of a traditional Radio Frequency (RF) relay link, is established between the relay station (RS) and the mobile terminal (MT). To simplify the structures of RS and the additional optical parts that shall be installed in the MT, the subcarrier-modulation based intensity-modulated direct-detection (IM/DD) is also adopted for both the up-link and the down-link. The proposed relay scheme not only enhances the transmission power, but also creates safe signal propagation environment, which is much meaningful for wireless and pervasive healthcare communication. Simulation results show that the proposed interference-reduced relay scheme provides a stable and high quality communication link when the average optical receiving power is larger than -25dBm.

  • An Optical IM/DD Based Spatial Transmission Diversity Achievable Relay Scheme

    Jiang Liu, Hiroshi Takano, Shigeru Shimamoto

    2009 IEEE WIRELESS COMMUNICATIONS & NETWORKING CONFERENCE, VOLS 1-5     1097 - 1102  2009  [Refereed]

     View Summary

    This paper presents an optical intensity-modulated direct-detection (IM/DD) based relay scheme for indoor optical wireless communication system. Multiple distributed optical relay links are set up between relay stations (RS) and mobile terminals (MT) to create multiple safe signal propagation links for wireless communication so that at least one link is available for data streaming. Different from conventional relay scheme, the phase shift of RF signals is pre-adjusted based on maximum ratio transmission (MRT) technique, and then relayed from multiple distributed optical transmitters which are set up in different places. The proposed relay scheme not only enhances signal power and achieves diversity, but also avoids possible obstruction of line-of-sight (LOS) signal. Furthermore since propagation phase variation of incoherent optical signal can be neglected, the propagation space becomes a non-directional scalar space, resulting in a much simpler system structure, where multiple optical antenna elements can be freely arranged, phase shift due to different transmitting paths is solely decided by the distance between transmitter and receiver, etc. The paper presents these features and also provides computer simulation results to demonstrate the performance. Simulation results show that the proposed relay system is much feasible and attractive, and it would be one of the promising candidates for future wireless and pervasive healthcare communication systems.

  • Long distance optical wireless network employing multiple access scheme

    Jiang Liu, Jin Sando, Wei Li, Hiroshi Takano, Shigeru Shimamoto, Chiemi Fujikawa, Kashiko Kodate

    GLOBECOM - IEEE Global Telecommunications Conference     2258 - 2262  2007

     View Summary

    There has been many developments in long distance optical wireless communication between buildings using rooftop-mounted units over Point-to-Point wireless links. We propose an Angle Division/Time Division Multiple Access scheme to perform Point-to-Multi-Point communication employing reflectors. A single reflector controlled by a stepping motor and an array of fixed reflectors were used. The width of the beam of the infrared rays is measured and the relationship between the width and the stepping angle deviation of the motor are demonstrated. Moreover, the received power, the bit error rate, and throughput of the proposal scheme are measured. The angle of the reflector and the reflection characteristics when using one or two reflectors were compared. In addition, the throughput characteristics of the proposal scheme were made clear by experiments.

    DOI

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Misc

  • Satellite-Terrestrial Cooperation System Based on Relaying through Mobile Vehicle Base Stations and Traffic Signal Base Stations

    松藤謙太, LIU Xuanning, 吉井一駿, ZHENNI Pan, 齋藤恵, LIU Jiang, 嶋本薫, 大倉拓也, 三浦周, 辻宏之, 吉村直子, 豊嶋守生

    電子情報通信学会技術研究報告(Web)   120 ( 404(RCS2020 203-261) )  2021

    J-GLOBAL

  • Dynamic Power Allocation in Parallel Interference Cancellation based NOMA Receiver

    DAWADI Bikash, ERNAWAN Mohamad Erick, PAN Zhenni, LIU Jiang, SHIMAMOTO Shigeru

    電子情報通信学会技術研究報告   117 ( 456(RCS2017 317-406) )  2018

    J-GLOBAL

  • Cooperative Traffic Light Control Approach for Reducing Traffic Congestion with V2I Network

    WANG Huan, LIU Jiang, PAN Zhenni, KOSHIMIZU Takashi, SHIMAMOTO Shigeru

    電子情報通信学会大会講演論文集(CD-ROM)   2017  2017

    J-GLOBAL

  • B-5-2 A Proposal of Interference Cancellation Scheme Based on IQ-Balanced Transmission

    Liu Jiang, Shimamoto Shigeru

    Proceedings of the IEICE General Conference   2006 ( 1 ) 354 - 354  2006.03

    CiNii

  • B-10-68 A Study on Medium-long Distance Optical Wireless Communication Network Employing Reflectors

    Liu Jiang, Li Wei, Sando Jin, Shimamoto Shigeru, Shimizu Kayo, Fujikawa Chiemi, Kodate Kashiko

    Proceedings of the Society Conference of IEICE   2005 ( 2 ) 286 - 286  2005.09

    CiNii

Research Projects

  • Proposal and Evaluation of Ultra Reliable Low Latency Communication

    Project Year :

    2019.04
    -
    2022.03
     

Presentations

  • An Optical IM/DD Based Spatial Transmission Diversity Achievable Relay Scheme

    IEEE Wireless Communications & Networking Conference (WCNC) 2009 

    Presentation date: 2009.04

  • An Optical IM/DD Channel Based Relay Scheme for Indoor Healthcare Communication System

    IEEE Consumer Communications and Networking Conference (CCNC) 2009 

    Presentation date: 2009.01

  • A Study on RF Signal Relay System employing Optical Wireless Communication

    Technical Committee on Optical Communication Systems (OCS) Conference, Japan 

    Presentation date: 2008.10

  • Long Distance Optical Wireless Network Employing Multiple Access Scheme

    GLOBECOM '07. IEEE 

    Presentation date: 2007.11

  • A Proposal of Interference Cancellation Scheme Based on IQ-Balanced Transmission

    2006 IEICE General Conference 

    Presentation date: 2006.03

  • A Proposal of IQ-Balanced Transmission Scheme

    Presentation date: 2005.11

  • A Study on Medium-long Distance Optical Wireless Communication Network Employing Reflectors

    Presentation date: 2005.09

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Specific Research

  • Non-invasive Healthcare Monitoring System using Wireless Technologies

    2019  

     View Summary

    Diseases such as diabetes, hypertension, etc. are progressing without the patient’s awareness. Without the early noticeable symptoms, a lot of people missed the opportunities in early diagnosis. A system that can provide vital data acquirement, analysis, and management support is desired. As the first step of our final target, in this academic year, the non-contact pulse, blood pressure, and glucose monitoring system are studies. The following works have been conducted1)    Non-contact pulse and blood pressure acquisition systemIn this research, a non-contact pulse and blood pressure monitoring system is designed. The frequencies used in this experiment are 28GHz and 32GHz, which are the same as 5G millimeter-wave signal. In the experiment, the relationship between the value of blood pressure and the shape of the waveform is analyzed. The experiment results have shown that the pulse and blood pressure can be detected by using millimeter waves. 2)  Glucose acquisition systemAmong various NGM technologies, infrared is considered as the most popular and prospective method. In this research, the mid-infrared spectroscope is used in the experiment. The association between mid-infrared transmittance and blood glucose concentration is studied. It is found that the infrared with a peak wavelength of 3333 ~2857 nm is a good solution for glucose measurement.

  • Non-invasive Monitoring System for Ubiquitous Healthcare using Optical Wireless Technologies

    2018  

     View Summary

    The aging population and a lack of recourses such asworkers, places in Japan become a serious concern. Miniature body sensors canperform long-term and ambulatory health monitoring, such as heart rate andblood pressure monitoring. However, technology, healthcare, and easy userinterface have not yet been collaborating deeply and much research is underway.This research uses light sensing to acquire biological information such asSpO2, blood pressure via a non-invasive approach. In this research, a cheap,easy to use, and low power consumption device prototype used to obtain SpO2related information is designed. The proper light wavelength for light sensingin our device is discussed and related experiments are carried out and the datais analyzed. The experiment and data analyzing results show that the proposedSpO2 evaluation method is useful and practical. In future work, the bloodpressure data processing method will be studied.

  • Indoor Positioning System Utilizing Visible Light Communication

    2017  

     View Summary

    Indoor positioning system has gaining lots of attention forindoor navigation recently since the GlobalPositioning System (GPS) hasvery low accuracy indoor. In the same time, Light-emitting Diodes (LEDs) havebecome the future generation of light source over the traditional one becauseof its various promising advantages such as low energy consumption,environmental friendliness, high luminous efficiency, low cost etc. Thisproject studied a positioningsystem utilizing Visible Light Communication (VLC). There are several otherexisting technologies which have been studied and used for indoor position suchas ultrasound, magnetic, Wi-Fi, Blue tooth technology and so on. However, thereare still have some problems related to the accuracy and high cost. In thisproject, an indoor positioning system using VLC is proposed. It provides higherposition accuracy within centimeter in low cost. Received Signal StrengthIndicator (RSSI) algorithm is used to estimate the coordination of the receiver.The position accuracy is analyzed by using a derived Cramer-Rao Bound (CRB).Moreover, several important factors for indoor localization such as incidentangles, LEDs layouts (square and triangular LED arrays), LEDs numbers and totalnoise has been considered.

  • RF and OWC access system empowered heterogeneous network

    2016  

     View Summary

      The mobile terminal has become anintegral device to society, enabling nearly ubiquitous communication of voiceand data. However, in some densely area, the limited bandwidth of radiocommunication can not satisfy each user with the increasing needs of amounts ofdata. In densely populated areas such as railway stations, current wirelesssystems such as Wi-Fi and LTE networks face great challenges or even fail todeliver high capacity and high quality-of-experience (QoE) broadband servicesto mobile users. This is mainly because current systems on one side are shortof radio bandwidth and lacking of synergy when conducting radio resourceoptimization. Optical wireless communication (OWC) can provide a high-speedcommunication. It combines the large bandwidth of optical fiber and themobility of current wireless communications using radio waves. However, opticalwireless communication also has some drawback such as the shadow issues. On theother hand, radio has the advantage of being available ubiquitously indoors andoutdoors, with the possibility of a seamless system infrastructure that allowsusers to move. This project is to design a hybrid radio frequency (RF) OWCsystem for providing high-speed broadband multimedia services in denselypopulated local areas.

  • Hybrid RF and Optical Wireless Access System

    2015  

     View Summary

    This research project aims to provide an indoor service using hybrid optical wireless and radio communication. In this project, the optical communication is used to get the position information and control channel signal of the mobile terminal. Normally, photo diode is used for VLC system. In this project, instead of using photo diode, image sensor is chosen for receiving light signal since image sensor is able to spatially separate optical signals and other light noise. LED arrays, which can enable optical MIMO schemes, are used to increase the data rate. Experiments are carried out to demonstrate this MIMO system using 6×6 LEDS and COMS image sensor as a receiver. In order to detect LED array from the serial photos taken by image sensor, two algorithms are proposed: Connected Component Labeling based LED array detection (CCLD) and Hough Transform based LED array Detection (HTD). In the LED array, 4 LEDs are Flag-LEDs, which are used for finding the start LED and decoding the LED array. CCLD and HTD algorithms are compared and the results show that CCLD is more suitable for our system. Moreover, an efficient data-traffic scheduling and radio resource allocation scheme is studied in this project. 

  • Hybrid Visible Light and Radio Communication for Location-specific Services in Intelligent Transportation System

    2014  

     View Summary

      In this research project, a hybridvisible light and radio communication for location-specific services inintelligent transportation system is studied. This location-specificcommunication using visible light allows the receiver at the vehicle to displayto the driver only that traffic information which is relevant to the location, whichthe vehicle is. Moreover, the drivers will not be bothered with trafficinformation irrelevant to them (e.g. those only relevant to neighboring lanes)and the user experience is improved. Nevertheless, it is well known that VLCcannot compete with radio frequency (RF) systems when it comes to long-distancetransmission. A hybrid system that makes use of VLC and RF communication is proposedto solve the above problem. In the proposed hybrid system, the transmittedinformation is divided between the VLC channel and the RF channel. VLC channelis used to maintain the positioning capability and RF channel is used to sendmost of the information. The theoretical work and simulation have been done toshow the effective communication area and the receivable information can beincreased by using the proposed system compared with a pure VLC system. 

  • 光無線通信における副搬送波ビームフォーミングに関する研究

    2009  

     View Summary

    光無線通信は,低コスト,電波と干渉しない、法規制を受けにくい,低消費電力を実現可能といった特徴から,データ通信の一手法として注目されてきた。一方で、電波通信とは異なる、いくつの技術的な困難を伴う。その中でも特に困難な問題として、ビームの幅と到達距離のトレードオフが挙げられる。具体的には、光ビームの幅を狭めることにより電力を集中すれば、伝播損失が少なくなり、誤り率特性の劣化を小さくできる。しかし、光は直線で伝搬するため、送信器ビームと受信器の位置を合わせなければ通信ができないため、ビームが狭くなればなるほど、通信可能な範囲が狭くなる。最も容易な解決方法はビームフォーミング方式を利用することであるが、光は周波数が非常に高いため、RFと同様に光信号の位相を調整する方法を用いたビームフォーミング方式は適さない。この問題を解消するため、著者らは、拡散した光ビームを使いながら移動端末が存在する場所に目的とする副搬送波のみをビームフォーミングにより効率良く伝送する、RF副搬送波ビームフォーミング方式を提案する。本研究では光無線通信を移動体通信に適用した場合について考察を行った。著者は以下の手順で進んでいた。まず、光チャンネルとして、外部の背景光雑音やその他のノイズの影響を考慮し、シミュレーションを行い、通信BER(Bit error rate)と光受信電力の関係を明らかにした。結果から、光受信電力が一定の閾値を超えると、良い性能の光無線通信ができることを証明した。次に、閾値以上の電力を達するため、送信機の配置位置、距離などをシミュレーションで考察した。また、ビームパターンを設計し、ビームの電力分布様子を明らかにした。ビームの電力分布を分析した結果、RF副搬送波ビームフォーミング方式が有効であると証明した。

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Syllabus

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