Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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Analysis of Immediate Network Coding for Wireless Relay Slotted ALOHA Systems

UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report 108 ( 134 ) 1 - 6 2008.7

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

Wireless multihop networks have been studied for the purpose of system capacity enhancement. On the other hand, network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless multihop networks. In this manuscript, we propose immediate network coding, which transmits the coding packets immediately if possible, for 2-hop wireless relay slotted ALOHA systems. We analyze the throuhput, the number of packet transmissions, and transmission delay of immediate network coding for 2-hop wireless relay systems with the naitive exclusive control and the coding priority control. Furthermore, we show that immediate network coding for the coding priority control can enhance the throughput if the transmit probability of the relay node is designed properly.

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Performance Analysis of an FFT Equalizer with Parallel Distortion Cancellation and Proposal for Performance Improvement

HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 108 ( 135 ) 1 - 6 2008.7

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

Distortion cancellation for FFT (Fast Fourier Transform) equalizers was proposed that mitigates degradation caused by fast fading. The FFT equalizer suppresses channel fluctuation of received signals, so the accuracy of the channel estimation considerably influences the performance of the FFT equalizer. Therefore, we propose a channel estimation by estimated transmitted signals for the parallel distortion cancellation. Besides, we analyze the degradation of FFT Equalizers for Parallel Distortion Cancellation in fast fading channel, and show the performance of the FFT equalizer with the proposed channel estimation by computer simulation.

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V-BLAST Detection Algorithm for Spatial Multiplexing Receivers with QPSK System

MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 108 ( 61 ) 55 - 60 2008.5

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

Spatial multiplexing system can offer a high channel capacity. In spatial multiplexing, the system should have the same number of transmitting antennas and receiving antennas for successful communication. Our purpose is to propose algorithms for spatial multiplexing decoder which can decode transmitted signals even if the number of transmitting antennas exceeds that of receiving antennas. In this paper, we propose and evaluate a new algorithm for V-BLAST decoder on QPSK systems. The algorithm can increase the number of signal streams from transmitting antennas that can be decoded successfully at the same number of receiving antennas. As a result of this, the algorithm with QPSK systems can expand the transmission capacity.

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Analysis of Wireless Relay Network Coding under Heterolytic Traffic Environments

UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 108 ( 60 ) 19 - 24 2008.5

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

Wireless multihop networks have been studied for the purpose of system capacity enhancement. On the other hand, network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless multihop networks. In this manuscript, we analyze the throughput, the number of packet transmissions, and transmission delay for 2-hop wireless relay slotted ALOHA systems with network coding under heterolytic traffic environments. Their analytical results can be derived by solving a queuing system for the state of buffer in the relay node.

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A Study on Network Coding for Wireless Relay Slotted ALOHA System

UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 107 ( 518 ) 151 - 156 2008.3

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

Wireless relay access networks have been studied for the purpose of system capacity enhancement, digital divide removal, etc. On the other hand, network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless relay networks. However, the theoretical performance analysis of MAC (Media Access Control) layer for the system applying the network coding is still an open problem. In this manuscript, we analyze throughput, number of packet transmissions, and system delay for 2-hop relay slotted ALOHA systems without network coding and with network coding. Their analytical results can be derived by solving a queuing system for buffer in the relay node.

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Parallel Distortion Cancellation for FFT Equalizers in Fast Fading Channels

HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 107 ( 518 ) 233 - 238 2008.3

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

Distortion cancellation for FFT (Fast Fourier Transform) equalizers was proposed that mitigates degradation caused by fast fading. The distortion canceller suppresses fluctuation of received signals fed to the FFT equalizer by subtracting some signals. Even though, those signals are made of demodulated signals of the FFT equalizer convoluted with channel impulse response, the demodulated signals are too erroneous to suppress fluctuation which causes serious performance degradation in severe fading channels. This paper proposes parallel distortion cancellation for FFT equalizers which is able to improve the BER (Bit Error Rate) performance in fast fading channels. In this cancellation, channel matrixes made up of the impulse responses at different times are used for FFT equalization and suppression of the fluctuation. Finally, its BER performance is evaluated by computer simulation.

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B-5-66 Transmission Performance Evaluation of OFDM with a Deterministic Cancellation Matrix Estimation Scheme in Heterodyne Multimode Receivers

Hayashi Daisuke, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the IEICE General Conference 2008 ( 1 ) 452 - 452 2008.3

B-8-23 A Simulator of In-home Power Line Channels Varying in Time Coincident with Power Cycle

Hayasaki Taro, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 2008 ( 2 ) 266 - 266 2008.3

B-5-85 Performance of Forward Error Correction in FFT Equalizers with Parallel Fading Distortion Canceller

HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIHARA Masahiro

Proceedings of the IEICE General Conference 2008 ( 1 ) 471 - 471 2008.3

B-8-24 Performance Evaluation of Variable Time Slot for Power Line Communications

Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 2008 ( 2 ) 267 - 267 2008.3

Frequency Domain Equalization with Mitigation of Fast Fading Distortion

FUJIMURA Yuki, UMEHARA Daisuke, DENNO Satoshi

The IEICE transactions on communications B 91 ( 3 ) 250 - 259 2008.3

Bit Loading Algorithms Synchronized with Commercial Power Supply on In-home Power Line Multicarrier Communications

HONDA Shinya, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 107 ( 463 ) 43 - 48 2008.1

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

In-home PLC (Power Line Communicaiton) is one of the most attractive in-home networkings. However, there are a lot of technical issues for the realization of PLC with hight rate and high reliability. These issues include the influence of frequency selective and linear periodically time-variant (LPTV) channel synchronized with commercial power supply. In particular, we show that some kinds of switching power cevices impact deep and deterministic time selectivity for power line channels. The combination of OFDM (Orthogonal Frequency Division Multiplexing) and bit loading algorithm is a powerful tool to increase the bit rate or reliability for quasi-static frequency selective channels including power line channels. However, a quick response will be required for the execution of bit loading algorithm since power line channels are synchronized with commercial power supply. In this paper, we propose a fast bit loading algorithm based on the fractional knapsack algorithm to enhance the bit rate under the condition that the transmitted power is constant. Furthermore, we evaluate the achievable bit rate of the proposed algorithm for the SNR over a power line channel and compare it with the achievable bit rate based on water filling theory.

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The Influence of Compact AC Adapter on PLC Equipments

UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 107 ( 463 ) 55 - 60 2008.1

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

The regulation on power line communication (PLC) has been eased in Japan and the frequency band between 2 and 30MHz can be exploited for in-home PLC. Several commercial PLC equipments are available in the market. Almost all PLC equipments take on a form of PLC adapters interconverting Ethernet signals and power line signals. We can construct in-home network by these PLC adapters easily because there are many power outlets in every room. However there are various factors destabilizing the communication among PLC adapters. These factors involve time-varying channel responses and noise characteristics synchronized with commercial power supply. In particular, we present a number of examples of more significant variations of the channel response affected by compact AC adapters. In this report, we show that the PLC adapters suffer from the time-varying channel responses and analyze their influence on the communication quality of the PLC adapters.

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A Simulator of In-home Power Line Channels Affected by Switching Power Supply Equipments

HAYASAKI Taro, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 107 ( 463 ) 49 - 54 2008.1

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

Indoor power line is one of the most attractive media for in-home networks. However there are many technical problems to achieve in-home power line communication (PLC) with high rate and high reliability. One of such the problems is degradation in performance of in-home PLC caused by periodically time-variant channel synchronized with commercial power supply when connecting switching power supply equipments. In this paper, we present a simulator of in-home power line channels affected by switching power supply equipments, and validate this simulator through performance evaluation of OFDM/64QAM under white Gaussian noise environments. Furthermore we evaluate the influence of periodically time-variant channel on communication quality by using the proposed simulator.

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A Deterministic Cancellation Matrix Estimation Scheme in Heterodyne Multimode Receivers

HAYASHI Daisuke, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 107 ( 439 ) 55 - 60 2008.1

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

When we realize multimode receivers using heterodyne reception, the image-band interference arises and deteriorates transmission performance significantly because of removal of radio frequency filters. Therefore, cancellation methods using Hilbert transform have been proposed, however, this method cannot remove the interference completely because of imperfectness of the Hilbert transformer. Then, in this report, we propose a scheme to cancel imperfectness of the transformer with cancellation matrix in intermediate frequency. In this scheme, we use downconverion not only to receive the desired signal but also the image-band signal and estimate the cancellation matrix using correlation matrix of these two signals. We describe that this scheme has superior estimation and cancellation performance.

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B-5-192 Performance Evaluation of Network Coding for Slotted ALOHA Wireless Relay System

Hirano Tomoya, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the IEICE General Conference 578 578 - 578 2008

B-5-74 Weight Generation Algorithm for V-BLAST Receiver with BPSK System

Maruyama Hirofumi, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 460 - 460 2008

B-5-24 Coded Fading Distortion Canceller for FFT Equalizers in Fast Fading Channels

HASHIMOTO Koichiro, UMEHARA Daisuke, DENNO Satoshi

Proceedings of the Society Conference of IEICE 2007 ( 1 ) 346 - 346 2007.8

Channel Capacity for Linear Periodically Time-variant Channels

HONDA Shinya, UMEHARA Daisuke, DENNO Satoshi

IEICE technical report 107 ( 142 ) 7 - 12 2007.7

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

Indoor PLC (Power Line Communication) is one of the attractive in-home networkings. However, there are a lot of technical issues for the realization of PLC with high rate and high reliability. In this paper, we apply OFDM (Orthogonal Frequency Division Multiplexing) system to a linear periodically time-variant channel measured from an indoor power line channel. Furthermore, we propose a time-frequency adaptive modulation system in which multivariate QAM (Quadrature Amplitude Modulation) based on the pouring theory is allocated to each subcarrier. We evaluate channel capacities of the periodically time-variant, multiplexing, binary symmetric channels (BSCs) obtained from each adaptive modulation, Gray coding, additive white Gaussian noise, and symbol decision.

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B-8-3 Analysis of Noise Statistics for Indoor Power Line Multicarrier Communication

Maehara Keiko, Umehara Daisuke, Denno Satoshi

Proceedings of the IEICE General Conference 2007 ( 2 ) 319 - 319 2007.3

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