Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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B-7-56 Analysis of Network Coding for Two-Hop Wireless CSMA Systems Enabled Carrier Sense

Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the Society Conference of IEICE 2009 ( 2 ) 124 - 124 2009.9

B-7-57 Effect of Noise and Interference on Asymmetric Node Number Model Using Wireless Network Coding

Takei Kaori, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the Society Conference of IEICE 2009 ( 2 ) 125 - 125 2009.9

B-7-58 Effect of Packet Length Asymmetry on Wireless CSMA/CA Network Coding

Huang Chun-hsiang, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the Society Conference of IEICE 2009 ( 2 ) 126 - 126 2009.9

B-7-55 A Study on Delay Performance of 3-hop Wireless Relay System Employing Network Coding

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

Proceedings of the Society Conference of IEICE 2009 ( 2 ) 123 - 123 2009.9

B-5-86 Iterative Detection with Soft Input for Virtual Layered Space-Frequency Receivers

Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2009 ( 1 ) 435 - 435 2009.9

Image-band Interference Cancellation for Multi-mode/band Receivers with Baseband AGC

LIU Ke, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 109 ( 155 ) 119 - 124 2009.7

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

An algorithm to cancel the image-band interference for Multi-mode/band receivers with baseband AGC is proposed in this paper. The algorithm proposed here estimates the phase error and the amplitude error of the analog Hilbert transformer with correlation matrices. Furthermore, filtering is employed here to improve the estimation accuracy. This paper also shows the error estimation performance of the proposed algorithm and the BER of the interference cancellation by computer simulation under the circumstance of CIR=-20dB, and compares them with that of the conventional algorithm.

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Analysis of Two-hop CSMA/CA Wireless Relay Network with Network Coding

HUANG Chun-hsiang, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report 109 ( 119 ) 67 - 72 2009.7

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

The method of wireless access is introduced to construct access networks in the circumstances that wiring network is intractable. Network coding is a highly regarded technology to enhance system capacity of wireless relay networks. By coding and transmitting packets from different sources at the relay station, the system is able to achieve higher throughput. In this manuscript, we propose an analytical model to compute the throughput of a two-hop wireless relay network in which stations employ CSMA/CA protocol and network coding on their MAC layer. We also confirm the difference between the results of theoretical analysis and computer simulations are negligibly small.

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Effect of Buffer Capacity on Network Coding for Two-Hop Wireless ALOHA Systems

UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report 109 ( 119 ) 73 - 78 2009.7

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

Wireless access systems employing wireless relay nodes have been studied for removing digital divides and blind zone areas. In this manuscript, we analyze the effect of finite buffer capacity on throughput and packet delay for two-hop wireless access systems both without and with network coding in which the nodes employ a slotted ALOHA protocol. We show that the buffer capacity is not relevant with the throughput for the assumed two-hop wireless network if network coding is not applied. On the other hand, we crarify that the buffer capacity has a significant impact on achievable throughput enhancement if network coding is applied.

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Effect of Noise and Interference on Asymmetric Traffic Model Using Wireless Network Coding

TAKEI Kaori, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report 109 ( 119 ) 79 - 84 2009.7

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

Wireless multihop networks have been studied for the purpose of solution of digital divide and system capacity enhancement. On the other hand, a network coding scheme has attracted attention as a technology for throughput enhancement. In this paper, we crarify how noise and interference have effects on system throughput performances for two-hop wireless relay slotted ALOHA systems in the cases with and without network coding under asymmetric traffic environments. As a result, the throughput performances of the asymmetric traffic models in the noise and interference environments can be evaluated analytically. In particular, we show the design criterion of the relay transmission probability for maximizing the throughput of systems with network coding.

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A Detection Method of Channel States for Periodically Time Variant Channels over Indoor Power Line

WATANABE Keita, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 109 ( 116 ) 53 - 58 2009.6

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

In this manuscript, we propose an initial acquisition method for detecting channel states on in-home broadband power line communication. It has been considered that the time fluctuation in the transfer function has been smaller than that in the noise on the in-home broadband PLC. However, we have observed that the extensively and rapidly time fluctuation across the whole frequency band appears in the in-home PLC at the half of power cycle intervals while connecting some switching power supply devices. Such largely and quickly time fluctuation makes the extensive degradation in performance of in-home PLC. Therefore, we should estimate the timing of time fluctuation and synchronize the in-home PLC systems with the estimated time fluctuation. We evaluate the performance of the proposed initial acquisition method under impulsive noise environments. As a result, we show that the proposed method can achieve the requirement for communication reliability.

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A Subcarrier CNR Estimation for Powe Line Multicarrier Communication

YABUUCHI Yasuhiro, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 109 ( 116 ) 47 - 52 2009.6

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

Indoor power line communication (PLC) is an attractive way to realize an in-home network. The bit-loaded orthogonal frequency division multiplexing (OFDM) is effective for PLC to achieve high bit rate by optimizing subcarrier modulations and code rate of a forward error correcting (FEC) code. The precise CNR information for each subcarrier should be estimated for achieving high bit rate. In particular, the subcarrier CNR information should be done within a short pilot symbol length because streaming services of voice and video are provided on in-home PLC. At first, this manuscript shows that the precise subcarrier CNR estimation for all the range of SNR cannot be achieved within the target pilot symbol length. Next, we propose three methods to achieve target BER within the target pilot-symbol length. First one is to smooth the estimated subcarrier CNR curve, second one is to give a margin of subcarrier CNR threshold for determining subcarrier modulation, and last one is to minimize the estimated subcarrier CNR locally. As a result of evaluating these three proposed methods, it is shown that the local minimization can achieve the best performances among them. Furthermore, we show the relationship between the pilot symbol length and the range of local minimization.

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Performance Analysis of Wireless ALOHA Network Coding for Two-Hop Bidirectional Traffic

UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report 109 ( 37 ) 13 - 18 2009.5

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

Wireless access systems employing wireless relay nodes have been studied for removing digital divides and blind zone areas. In this manuscript, we analyze the group throughput and group packet delay for two-hop wireless access systems with one relay node in which slotted ALOHA protocol and network coding are applied to nodes. Furthermore we clarify an achievable region in slotted ALOHA throughput for one-relay two-hop wireless access systems regardless of whether the buffer in the relay node is saturated or not.

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Performance of Successive Detection Architecture with Virtual Channels for MIMO-OFDM Systems

IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 109 ( 38 ) 13 - 18 2009.5

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

When the MIMO spatial multiplexed signals are decoded, conventional successive detector requires the same number of antennas at the receiver as that at the transmitter. In addition, the number of antennas that can be installed in the mobile terminals is limited. For these reason, in the down-link for mobile communication, it has been difficult to increase transmission capasity by spatial multiplexing. Therefore, the architecture has been proposed which can decode transmitted signals when the number of antennas at the transmitter ecxeeds that of at the receiver. This receiver can double the number of antennas at the receiver virtually. In this manuscript, we apply this architecture to OFDM-QPSK modulated signals and propose some schemes for improvement of this architecture. The performance of the proposed architecture is verified using computer simulations.

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B-8-5 Initial Acquisition Algorithm for Channel Synchronization in Power Line Communications

Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 2009 ( 2 ) 271 - 271 2009.3

B-5-16 Performance of Successive Detection Architecture with Virtual Channels for MIMO-OFDM Systems

Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2009 ( 1 ) 449 - 449 2009.3

B-7-8 System Thoroughput for Wireless Multihop Access System Employing Network Coding

Takei Kaori, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

Proceedings of the IEICE General Conference 2009 ( 2 ) 152 - 152 2009.3

B-7-9 3-hop Wireless Relay Slotted ALOHA System Employing Network Coding

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

Proceedings of the IEICE General Conference 2009 ( 2 ) 153 - 153 2009.3

B-5-64 The Scheme of Complexty-Reduction for Adaptive Multi-Band Array

Tamaoki Masahiro, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the IEICE General Conference 2009 ( 1 ) 497 - 497 2009.3

B-5-17 Successive Receiver with Coded Virtual Channel for Layered Space Time Communications

Maruyama Hirofumi, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2009 ( 1 ) 450 - 450 2009.3

B-5-50 Analysis of OFDM Communication Systems in Fast Fading Channels

AOKI Ippei, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

Proceedings of the IEICE General Conference 2009 ( 1 ) 483 - 483 2009.3

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