Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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B-21-20 A Study of CSMA/CA Incorporating Packet Aggregation and Network Coding

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

Proceedings of the IEICE General Conference 2011 ( 2 ) 676 - 676 2011.2

Channel Capacity of Two-Way Relay Channel by CoMP Physical-Layer Network Coding

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

IEICE technical report 110 ( 441 ) 7 - 12 2011.2

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

In this manuscript, a physical-layer network coding (PNC) scheme, CoMP-PNC, is proposed for wireless distributed networks with coherent coordinated multi-point (CoMP). Wireless relaying could be done to reduce the transmission power of wireless stations in a CoMP cluster in which the carrier frequency and phase are synchronized at destination stations whereas the channel capacity will be reduced in the conventional wireless relaying due to the increase of number of hops. A CoMP-PNC scheme incorporating preceding and modulo encoding is applied for two-way relay channels in a CoMP cluster. The channel capacity is formulated for 802.11a/g-based orthogonal frequency division multiplexing and quadrature amplitude modulation (OFDM-QAM) singals in indoor environments.

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A Study of Introducing Distributed Transmit Power Control to Distributed Antenna System

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

IEICE technical report 110 ( 433 ) 73 - 78 2011.2

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

Multi-user distributed antenna systems are studied to build wide area coverage radio communication systems under restriction on transmit power. To decrease transmit power, this paper proposes a power control algorithm for single-user distributed antenna systems as an initial study. The proposed algorithm is based on the Foschini-Miljanic's power control algorithm which is one of the most famous algorithm on distributed power control. This is because multi-user distributed antenna systems consist multiple CoMP clusters of base station antennas and mobile stations, and interference between CoMP clusters should be controlled in a decentralized way. A degree of freedom of transmit power on each base station antenna still exists because the proposed algorithm is only based on the SINR. In addition, the convergence condition for the proposed power control is derived. The performance of extended algorithm is evaluated through computer simulations.

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Transmit Power Analysis of Precoded Multi-user Distributed Antenna Systems

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

IEICE technical report 110 ( 433 ) 79 - 84 2011.2

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

In distributed antenna system (DAS), spectrum efficiency can be improved by using multiuser MIMO techniques. The computational complexity at mobile stations can be reduced by precoding techniques with channel state information. To extend DAS, BSs and MSs should be properly grouped into control clusters in order to reduce the computational complexity. Interference among clusters and the required transmit power depend on the clustering patterns. In this paper, a clustering method is proposed in order to reduce the transmit power. The performance of the proposed method is examined through computer simulations.

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Complexity Reduced Lattice-Reduction-Aided Receiver with Virtual Channel for MIMO-OFDM Systems

YOSHIKAWA Shogo, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 368 ) 67 - 72 2011.1

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

A lattice-reduction-aided receiver with virtual channel detection that can provide high performance when the number of antennas at the receiver is smaller than the number of signal streams multiplexed in the MIMO channel has been proposed. The receiver uses a lattice-reduction scheme and a concept of virtual channel detection is applied in order to detect signals under the above condition. In this manuscript, Orthogonal Frequency Division Multiplexing is applied to the lattice-reduction-aided receiver with virtual channel detection and we propose a way to reduce the computational complexity when lattice-reduction scheme is performed to virtual channels.

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Study of STBC Based Cooperative Relaying System Using Network Coding

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

IEICE technical report 110 ( 339 ) 91 - 95 2010.12

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

In multi-hop cooperative communication systems, multiple relay stations which are located between the source and destination stations transmit a packet cooperatively. Transmission quality can be improved by the transmit diversity gain. Recently, theoretical analysis, computer simulations and field trials are reported. On the other hand, network coding can improve channel efficiency in two-way relay transmission. By introducing network coding into multi-hop cooperative communication systems, packets can be transmitted bidirectionally and effectively. In this study, several relay control schemes are investigated by computer simulations.

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A Simple Compensation Scheme on Performance of IEEE 802.11 DCF

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

IEICE technical report 110 ( 269 ) 29 - 34 2010.11

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

In this manuscript, a simple and accurate estimation on performance of IEEE 802.11 distributed coordination function (DCF) is presented. The performances obtained from Bianchi's analytical model of IEEE 802.11 DCF are compensated by means of (1) the number of consecutive successful packet transmissions and (2) the deferred slot time. The compensated performances including throughput, packet loss rate, and the average number of packet transmissions approximate to the simulation results with a high degree of accuracy under a number of conditions even when the minimum contention window is extremely small. As a result, the proposed estimation can be exploited to optimize the medium access control (MAC) parameters of IEEE 802.11 such that the throughput is maximized subject to a variety of QoS constraints.

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Performance analysis of CSMA/CA protocol in long distance wireless access

IEICE technical report 110 ( 253 ) 97 - 102 2010.10

The Performance of Lattice-Reduction-Aided Receiver with Virtual Channel Detection for MIMO Spatial Multiplexing

YOSHIKAWA Shogo, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 251 ) 199 - 204 2010.10

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

A lattice-reduction-aided receiver with virtual channel detection that can provide high performance when the number of antennas at the receiver is smaller than the number of signal streams multiplexed in the MIMO channel has been proposed. The receiver uses a lattice-reduction scheme and a concept of virtual channel detection is applied in order to detect signals under the above condition. The performance and the computational complexity of the receiver is shown by using numerical simulations.

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Virtual Layered Space Time Receivers for 16QAM Modulation

IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 251 ) 187 - 191 2010.10

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

In the down-link for mobile communications, there has been probrem that spatial multiplexing is limited because mobile terminal should be small while the number of receiving antenna restricts quantities of streams which can be multiplexed. Therefore, an architecture has been proposed which can decode transmitted PSK modulated signals when the number of transmitting streams ecxeeds the number of receiving antenna. This receiver utilize the idea called virtual channels which can double the number of antennas at the receiver virtually. In this manuscript, we introduce how to apply the idea called virtual channels to QAM modulated signals and compare various detection scheme by showing their BER performance and complexity of calcuration. Moreover, we propose additional scheme to improve BER performance of this detection scheme. The performance of the introduced architecture is verified using computer simulations.

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A High Speed Transmission Scheme with Multilevel Modulation

ISOGAI Taiki, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 251 ) 211 - 215 2010.10

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

Distortion cancellation for FFT (Fast Fourier Transform) equalizers in fast fading channels was proposed. The distortion canceller is designed to anticipate the fading distortion by subtracting a based channel impulse response from the channel impulse response. Then it eliminates the distortion from the received signal in order to apply the FFT equalizer. And by making this proposed circuit parallel, the BER (Bit Error Rate) performance was improved. We propose another parallel distortion cancellation scheme and show that BER leads to more than 5dB degradation in E_b/N_0 on BER=10^<-7> for multilevel modulations like 16QAM and 64QAM.

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B-5-25 A Virtual Layered Space Receiver for QAM Modulation

Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2010 ( 1 ) 379 - 379 2010.8

B-5-26 The Performance of Lattice-Reduction-aided Real Spatial Filter with Virtual Channel Detection for MIMO Spatial Multiplexing

Yoshikawa Shogo, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2010 ( 1 ) 380 - 380 2010.8

Analysis of impacts of propagation delay on long distance access with IEEE802.11 CSMA/CA

IEICE technical report 110 ( 129 ) 1 - 6 2010.7

Invited talk: Studies on random access based wireless network coding: from slotted ALOHA to CSMA/CA

IEICE technical report 110 ( 129 ) 69 - 74 2010.7

Complexity Reduced Detection For Virtual Layered Space Time Receivers

OHNISHI Ryota, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 77 ) 97 - 102 2010.6

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

In this paper, we introduce, a new method named "Complexity Reduction Method based on Compensation Distance" in order to reduce the complexity of the detection in virtual layered space-time receivers in multiple-input multiple-output (MIMO) systems. Moreover, this method is practical even when the number of transmitting streams is greater than that of receiving antennas. Computer simulations indicate that the proposed method can be used to reduce the complexity of detection to approximately 20% in [8×4] (the transmitter is equipped with 8 antennas and the receiver is equipped with 4 antennas) systems.

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Iteration Schemes on Soft Information for Virtual Layered Space-Frequency Receivers

IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 77 ) 13 - 18 2010.6

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

Generally, spatial multiplexed signals cannot be applied successfully by the space filaters when the number of transmitting streams exceeds that of receiving antennas. The idea called "virtual channel" is proposed which enabels the decoding of MIMO-OFDM signals when the successive detector is applied. Additionally, iteration schemes on soft informations are effective for the virtual channel estimation. In this paper, we show some performances of the iteration schemes when the various rate and constraint length is used.

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Lattice-Reduction-aided MMSE Receiver with Virtual Channel Detection for MIMO Spatial Multiplexing

YOSHIKAWA Shogo, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 110 ( 77 ) 103 - 107 2010.6

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

This paper proposes an MMSE receiver architecture that can provide high performance when the number of antennas at the receiver is smaller than the number of signal streams multiplexed in the MIMO channel. The proposed receiver involves the use of a virtual channel and can detect signals under the above condition. Furthermore, the performance is improved by adopting the lattice-reduction scheme to the virtual channel. Numerical simulations show that the performance of this scheme is comparable to that of the maximum likelihood detection when the number of transmit antennas is twice that of receiving antennas.

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Performance of multimode receivers dependent on frequency response of Hilbert transformer and equalization of the response

HOMMA Hiroaki, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 110 ( 41 ) 95 - 100 2010.5

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

A heterodyne receiver with the Hilbert transformer is in principle known to cope with signals in arbitrary frequency bands. Moreover, the dual frequency conversion has been proposed to mitigate the interference due to the imperfection of actual Hilbert transformers. This paper evaluates the performance of the receiver where the frequency response of the desired band differs from that of the image band. Furthermore, we propose a moved scheme to improve the performance. The proposed scheme consists of the estimation of the Hilbert transformer's imperfection and the baseband linear filtering. Computer simulation shows that the proposed scheme achieves by 9dB better BER performance than the conventional scheme when CIR (Carrier-to-Interference Ratio) is -60dB and BER is 10'.

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B-8-26 Initial Acquisition Algorithm of Channel State Detection for Indoor Power Line Communications

Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 2 ) 289 - 289 2010.3

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