Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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Laboratory Experiments of USRP/UHD Wireless Terminal for Multi-uesr MIMO Systems

DOI Hiroshi, MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

Technical report of IEICE. RCS 111 ( 260 ) 31 - 35 2011.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In a multi-user MIMO system which can increase the spectral efficiency in wireless communications, MIMO preceding can reduce signal processing complexity and power consumption of mobile stations. In this paper, experimental results of the universal software radio peripheral (USRP) are reported. Mobile stations for a multi-user MIMO preceding system are implemented by using USRP. The universal hardware driver (UHD) is used in this implementation. An advantage of using UHD is that it makes easier to manage timing of USRP. In addition, as laboratory experiments of USRP and UHD, it is shown that its frequency stability, time resolution and the error vector magnitude performance during amplify and forward operation.

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Study of Optimal Cluster Size Depending on Scheduling Algorithms in Multi-User Distributed Antenna System

KOBAYASHI Masahiro, YAMAMOTO Koji, MURATA Hidekazu, YOSHIDA Susumu, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

Technical report of IEICE. RCS 111 ( 260 ) 201 - 206 2011.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In wireless communications, a distributed antenna system (DAS) is a promising technique to increase the spectral efficiency. DAS consists of geographically distributed base station antennas, which enables to perform virtual MIMO transmission and achieve macro-diversity efficiency. DAS has many degrees of freedom such as antenna selection, clustering of antennas, and transmission schemes, and therefore it is complicated to analyze. In this paper, the cluster size in DAS is considered to be similar to the radius of cells in cellular systems. In clustering based on location, the coverage area of clusters and the area of base station antennas used for transmission can be set individually. The simulation results show that the optimal cluster size for base station antennas depends on the scheduling algorithm when analyzed in perspective of area spectral efficiency.

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In-lab Transmission Experiments of Multi-user MIMO Precoding System

UEYAMA Yuichi, MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

Technical report of IEICE. RCS 111 ( 260 ) 37 - 40 2011.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This paper reports the performance of a multi-user MIMO linear precoding system using a two-way MIMO channel estimation technique. Hardware implementation feasibility of this technique is not studied yet. The experimental system consists of a base station with two antennas and two mobile stations. In this paper, feasibility of the multi-user MIMO precoding system using a two-way channel estimation technique is shown by in-lab experiments using a fading emulator.

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A Comparative Discussion of the Error Estimation Accuracy of Hilbert Transformer for Multi-mode Receivers with Baseband AGC

KOSUGA Yohei, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 111 ( 261 ) 37 - 41 2011.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This paper proposes a novel scheme to estimate the imbalance of the RF devices included in RF analog Hilbert transformer in heterodyne multimode receivers with baseband AGC, which enables the receiver to receive signals in arbitrary frequency band with realistic hardware complexity. The performance of the estimation scheme is verified by computer simulation in terms of the root mean square (RMS) of the estimation error, and the distribution of the error. Furthermore, it is also shown that the performance of the proposed scheme is enhanced by feeding the estimated value back to the RF analog devices. The performance is compared with that of conventional techniques.

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Performance Improvement against Imperfection of Analog Devices for Complexity Reduced Multimode MIMO Receiver

OHTA Tomoya, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 111 ( 261 ) 29 - 36 2011.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Cognitive radios are of interest because they are capable of high frequency utilization efficiency. For the cognitive radios, a multimode MIMO receiver based on heterodyne reception has been proposed. This paper proposes the complexity reduced receiver to achieve high performance by correcting Hilbert transformer imperfection at the intermediate frequency (IF) band. However, imperfection of the analog circuit at the feedback loop causes poor performance. Therefore, the scheme for correcting the imperfection of the analog circuit is proposed.

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Possibilities and Issues of Coherent Distributed Antenna Systems : Towards Realization of Green Wireless Systems

MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report. WBS, Wideband System 111 ( 244 ) 9 - 12 2011.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This paper presents an experimental setup of a multi-user MIMO linear precoding system. The experimental system consists of a base station with two antennas and two mobile stations. In this system, a two-way channel estimation technique is implemented in which mobile stations just send back the received signals along with their training sequences. In this technique, the base station can obtain the channel coefficients of both the uplink and the downlink. This two-way multiple-input multiple-output channel estimation technique has been pro- posed and mathematically analyzed in literature. Computer simulation results have been reported to identify the required hardware specifications for amplify and forward operation in mobile stations by examining the bit error rate performance. However, hardware implementation feasibility of this technique is not studied yet. In this paper, feasibility of a multi-user MIMO linear precoding system using two-way channel estimation technique is shown by in-lab experiments.

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Throughput Analysis of Two-Way Relay Channels by M-ary CoMP Physical-Layer Network Coding

UMEHARA Daisuke, YAMAMOTO Koji, MURATA Hidekazu, DENNO Satoshi, MORIKURA Masahiro, YOSHIDA Susumu

111 ( 301 ) 7 - 12 2011.10

BS-3-3 Introducing Distributed Power Control Using 2-bit Feedback Information to Distributed Antenna System

Kumagawa Shigemasa, Yamamoto Koji, Murata Hidekazu, Yoshida Susumu, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2011 ( 1 ) "S - 37"-"S-38" 2011.8

B-5-1 A Comparative Discussion of the Error Estimation Accuracy of Hubert Transformer for Multi-mode Receivers with Baseband AGC

Kosuga Yohei, Denno Satoshi, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2011 ( 1 ) 380 - 380 2011.8

Coexistence Scheme between WLAN and Wireless Sensor Network

FUJII Yohei, MORIKURA Masahiro, UMEHARA Daisuke, DENNO Satoshi, OTSUKI Nobuaki, SUGIYAMA Takatoshi

IEICE technical report 111 ( 68 ) 65 - 70 2011.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This paper proposes a new control scheme between IEEE 802.11 (WLAN) devices and IEEE 802.15.4 (Wireless Sensor Network) devices, operating in the same radio frequency band. The new control scheme employs a hybird - station (H-STA) which has both network device functions to improve the transmission quality. The proposed control scheme enables to ensure data transmission quality of WSN with little performance degradation of WLAN throughput performances by using RTS (Request To Send), CTS (Clear To Send) and CTS-to-self packets. Results of computer simulations show that the beacon failure probability of WSN is the value less than 10 % when the WLAN system consists of 15 stations with saturated data traffic.

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Performance Improvement of Wireless Relay CSMA/CA System Employing Network Coding by QoS Control

NAKATO Yuki, MORIKURA Masahiro, UMEHARA Daisuke, DENNO Satoshi, OTSUKI Nobuaki, SUGIYAMA Takatoshi

IEICE technical report 111 ( 68 ) 71 - 76 2011.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This paper proposes new priority control schemes for a two-hop wireless relay system which employs the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol based on the IEEE 802.11e standard and a network coding method. The proposed priority control scheme which controls AIFSN or CW_<min> of wireless stations (STAs) improves the VoIP transmission quality and throughput performances of data transmission. Computer simulations show that the proposal schemes achieve the lower packet loss rate and delay for VoIP transmission and better uni-directional throughput performances of data transmission, compared with the conventional CW_<min> control scheme for an access point (AP) and a relay station (RS).

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A Multimode MIMO Successive Detector

OHTA Tomoya, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 111 ( 13 ) 1 - 6 2011.4

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Nowadays, cognitive radio draws attention because it can raise frequency utilization efficiency. For the cognitive radio, multimode receivers are required to make use of the empty frequency bands. On the other hand, MIMO spatial multiplexing is also focused on to increase transmission capacity. Moreover, the MIMO-MMSE receiver has been applied to the multimode reception. However, it is well known that performances of the MMSE filter is inferior to those of the other techniques. This paper proposes the structure of multimode MIMO-OSD receiver based on the heterodyne reception in order to improve BER performances. As a result of computer simulation, the proposed receiver can achieve superior BER performances even in the presence of strong imageband interference signals, and attain convergence within 200 symbols.

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B-21-19 Performance Improvement of VoIP Transmission for Wireless Relay CSMA/CA System by Network Coding

Nakato Yuki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

Proceedings of the IEICE General Conference 2011 ( 2 ) 675 - 675 2011.2

B-5-7 A High Speed Transmission Scheme using Parallel FFT Equalization in Fast time-varying Multipath Fading Channels

Isogai Taiki, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2011 ( 1 ) 393 - 393 2011.2

B-20-26 A Proposal of Coexistence Scheme between WLAN and Wireless Sensor Network

Fujii Yohei, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

Proceedings of the IEICE General Conference 2011 ( 2 ) 621 - 621 2011.2

B-5-93 Study of Clustering Schemes for Multi-user MIMO Distributed Antenna Systems

Nakahira Toshiro, Matsusaka Masahiro, Murata Hidekazu, Yamamoto Koji, Yoshida Susumu, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 2011 ( 1 ) 479 - 479 2011.2

B-5-83 Study of Optimal Cyclic Prefix Length in Multi-User Distributed Antenna System

Kobayashi Masahiro, Yamamoto Koij, Murata Hidekazu, Yoshida Susumu, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 2011 ( 1 ) 469 - 469 2011.2

B-8-31 A Study of Physical-Layer Network Coding by Coherent CoMP

Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Yamamoto Koji, Murata Hidekazu, Yoshida Susumu

Proceedings of the IEICE General Conference 2011 ( 2 ) 280 - 280 2011.2

B-5-95 Virtual Layered Space Time Receivers for 16QAM Modulation

Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2011 ( 1 ) 481 - 481 2011.2

B-21-21 Evaluation of CSMA/CA Protocol in Long Distance Wireless Communication

Tanaka Masaaki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

Proceedings of the IEICE General Conference 2011 ( 2 ) 677 - 677 2011.2

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