Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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B-7-11 Analysis of Wireless Relay Slotted ALOHA Network Coding Employing Poisson Traffic

Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the IEICE General Conference 2009 ( 2 ) 155 - 155 2009.3

B-7-10 Proposals of Relay Control Scheme for CSMA/CA system with Wireless Network Coding

Huang Chunhsiang, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the IEICE General Conference 2009 ( 2 ) 154 - 154 2009.3

Performance Analysis of Succesive Receiver Architecture with Virtual Channel Detection for MIMO Spatial Multiplexing

MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 108 ( 445 ) 113 - 118 2009.2

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

MIMO spatial multiplexing system requires same number of receiving antennas or more than transmitting antennas. Our proposed successive receiver can double the number of receiving antennas virtually. Therefore the receiver can decode transmitted signals even if the number of transmitting antennas exceeds that of receiving antennas. In this manuscript, the effects of factors in the proposed receiver on system error rate are evaluated. In addition, we propose phase sequence coding in order to improve performance of the receiver. Then, it is evaluated that phase sequence coding can improve bit error rate performance of the proposed receiver.

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Analysis of OFDM Communication System in Time-Varying Fading Channels

AOKI Ippei, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 108 ( 445 ) 349 - 354 2009.2

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

With OFDM (Orthogonal Frequency Division Multiplexing) communication system, the BER (Bit Error Rate) quality is good in multi-path fading channels, but the quality gets worse markedly in fast fading channels that the fading change is very fast. So we evaluate the parallel OFDM demodulation method. In the method, we demodulate OFDM symbols with the channel impulse responses of different time and select the reasonable symbols from the demodulated symbols and correspond. And we propose the two distortion cancellation methods of cancelling the fading change with the symbols demodulated. The one method is the parallel time domain distortion canceller. With the method, we cancell directly the chanege that the received signals has. The next one is the parallel frequency domain distortion canceller. With the method, after we do FFT (Fast Fourier Transform) the received signals, we cancell the interference. We evaluate these qualties with the computer simulation.

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A Challenge for Multimode Receivers with An RF Receiver Chain : A dual frequency conversion heterodyne receiver

DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 108 ( 400 ) 43 - 48 2009.1

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

We have investigated on a multimode/multiband receiver with an RF receiver chain. Basically, an RF band pass filter at the RF front end prevents multimode/band communications because of little flexibility of the BPF. Therefore, we have tried to design multimode/multiband receivers with an ultra wide band RF BPF. While pass-band of the RF-BPF is widened, an IF-BPF with relatively narrow pass-band is applied in the receiver, which is so called "heterodyne receiver". As is known, however, the heterodyne receiver with the ultra wide band RF BPF suffers from severe image-band interference. Therefore, we have proposed dual frequency conversion heterodyne receiver with some image-band interference cancellers to overcome the problem. In this report, principle of image-band interference cancellation is briefly explained and challenges for implementing the imageband interference cancellers are described.

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Throughput Enhancement with OFDMA on In-home Power Line Communications

HAYASAKI Taro, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 108 ( 394 ) 43 - 48 2009.1

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

The in-home broadband power line communication (PLC) is drawing attention to us lately. The broadband PLC has regulation issues for the coexistence with shortwave wireless systems. Therefore, orthogonal frequency division multiplexing (OFDM) is adopted for the broadband PLC. On the other hand, the power line channels suffer from frequency selective fading. It is effective to load appropriate bits on each subcarrier in the OFDM for PLC. In this paper, we propose a bit loading algorithm that maximizes the bit rate by optimizing not only the bit quantity on each subcarrier but also the whole code rate of the forward error correction (FEC) code subject to constraints on the total bit error rate (BER) and power on each subcarrier. Furthermore, we investigate orthogonal frequency division multiple access (OFDMA) as a multiple access scheme on the in-home power line networks. We show that the proposed OFDMA scheme is superior to a time division multiple access (TDMA) scheme from the viewpoint of throughput by computer simulations.

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Consideration on Iterative Decoding of M-ary Modulation Signals over Hidden Markov Noise Channels

UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 108 ( 394 ) 13 - 17 2009.1

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

The indoor power line communication (PLC) suffers from impulsive noise generated by home appliances. The impulsive noise can be described as the bursty noise among several symbols for high-rate PLC employing M-ary modulation. Such bursty and impulsive noise can be widely applied as noise on a hidden Markov model for high-rate PLC. In this manuscript, we investigate the iterative decoding of M-ary modulation signals over hidden Markov noise channels. We evaluate the iterative decoding performance for structured LDPC codes, which are exploited for the digital broadcasting standard DVB S.2 of ETSI, and M-ary QAM (quadrature amplitude modualtion) signals. We clarify the importance of detecting metric for hidden Markov noise channels and investigate the difference between Gray mapping and binary mapping in decoding performance and the effectiveness of bit interleaver.

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Consideration of Initial Acquisition Method for Channel Synchronization on In-home Power Line Communications

WATANABE Keita, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

IEICE technical report 108 ( 394 ) 37 - 42 2009.1

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

In this paper, we propose an initial acquisition method for channel synchronization on in-home broadband power line communication (PLC). 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 devices. 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 and investigate its feasibility for the real in-home PLC.

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Consideration on Delay Performances of Wireless Relay Slotted ALOHA Network Coding Systems

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

IEICE technical report 108 ( 342 ) 79 - 84 2008.12

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

Wireless multihop networks have been studied for the purpose of system capacity enhancement and solution of digital divide. On the other hand, network coding is a recent and highly regarded technology for throughput enhancement on wireless multihop networks. In this manuscript, we propose a coding timeout control scheme which can enhance the throughput and reduce the delay for wireless relay slotted ALOHA systems with network coding. We evaluate the throughput and delay of the proposed scheme and compare them with these of an equal control scheme which does not distinguish the coding and native packets in the relay node. As a result of computer simulation we show that the coding timeout control scheme which selects the timeout values adaptively with throughput of the relay node is superior to a equal control scheme in delay performances.

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Throughput Analysis of Network Coding on Wireless Relay Slotted ALOHA Systems

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

IEICE technical report 108 ( 342 ) 73 - 78 2008.12

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

Wireless relay access networks have been studied for removing digital devides and deploying disaster information networks with low cost. Network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless relay networks. In this manuscript, we analyze the throughput of network coding in slotted ALOHA for 2-hop wireless relay systems taking consideration on packet error rate (PER).

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Adaptive Multi-Band Array for Cancelling Co-Channel Interference and Image-Band Interference

TAMAOKI Masahiro, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 108 ( 305 ) 71 - 76 2008.11

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

Various radio transmission systems have recently been commercialized. So, multiband/mode receiver which enable one RF chain to receive some frequency band is important. We proposed an architecture which reduce the circuit size to concurrently cancel co-channel interference and image-band interference. We adopt analogue Hilbert transformers to cancel image-band interference and adaptive array antenna to cancel co-channel interference. Furthermore, we can miniaturize the receiver by mixing all signals at the IF stage and reduce complexty by new algorithm. We also show performance of the proposed system by computer simulation. As a result, image-band interference can caused by some imperfection of Hilbert transformer can be completely canceled. Moreover, co-channel interference can be simultaneously canceled.

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Achievable Region in Slotted ALOHA Throughput for Wireless Relay Network Coding

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

IEICE technical report 108 ( 258 ) 25 - 30 2008.10

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

Wireless multihop networks have been studied for the purpose of system capacity enhancement. Network coding is a recent and highly regarded technology for system capacity enhancement on wireless relay networks. This manuscript clarifies an achievable region of throughput in slotted ALOHA applying network coding on two-hop wireless relay networks. As a result, we reveal the applicable scope of network coding.

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B-5-33 Adaptive Multi-Band Array for Canceling Co-Channel Interference and Image-Band Interference

Tamaoki Masahiro, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2008 ( 1 ) 346 - 346 2008.9

B-5-70 A Study on Decoding Algorithms for V-BLAST with Real Vetotor Weight

Maruyama Hirofumi, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2008 ( 1 ) 383 - 383 2008.9

B-8-8 Study on a Bit Loading Algorithm for Indoor Power Line Communication

Hayasaki Taro, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2008 ( 2 ) 131 - 131 2008.9

B-8-9 Proposal of Synchronization Algorithm in Periodically Time-Variant Channels for Power Line Communications

Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2008 ( 2 ) 132 - 132 2008.9

B-5-105 Performance Evaluation of Wireless Relay Network Coding under Heterolytic Traffic Environments

Hirano Tomoya, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the Society Conference of IEICE 2008 ( 1 ) 418 - 418 2008.9

B-5-106 Consideration on Delay of Wireless Relay Slotted ALOHA Network Coding

Umehara Daisuke, Hirano Tomoya, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

Proceedings of the Society Conference of IEICE 2008 ( 1 ) 419 - 419 2008.9

Consideration on Relay Control Schemes of Wireless Relay Slotted ALOHA Network Coding Systems

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

IEICE technical report 108 ( 188 ) 181 - 186 2008.8

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

Wireless multihop networks have been studied for the purpose of system capacity enhancement and solution of digital divide. On the other hand, network coding is a recent and highly regarded technology for throughput enhancement on wireless multihop networks. In this manuscript, we consider relay control schemes of relay node, for wireless relay network coding systems which adopt Slotted ALOHA as a media access control protocol. We propose a coding timeout control scheme, and compare it with a coding priority control scheme. As a result, we show that the proposed scheme can achieve higher throughput, lower delay, and lower variance of delay than the coding priority control sheme.

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Performance of Spatial Multiplexing Systems with Real Weight Vector

MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 108 ( 188 ) 31 - 36 2008.8

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

Spatial multiplexing system can achieve improvement in transmission capacity. Spatial multiplexing system requires the same number of transmitting antennas and receiving antennas for successful communication. The purpose of this study is to generate the "real weight algorithm" for spatial multiplexing system which can decode transmitted signals even if the number of transmitting antennas exceeds that of receiving antennas. Performance of the real weight algorithms for BPSK and QPSK systems has been evaluated previously. In this paper, the algorithms are improved in order to increase performance.

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