Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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B-21-15 Throughput Enhancement with AIFS Control for Wireless Relay Systems

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

Proceedings of the IEICE General Conference 2010 ( 2 ) 665 - 665 2010.3

B-21-18 Throughput Maximization Matched with Link Quality for Wireless Relay Slotted ALOHA Systems with Network Coding

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

Proceedings of the IEICE General Conference 2010 ( 2 ) 668 - 668 2010.3

B-20-36 Throughput Evaluation of IEEE 802.15.4 Unslotted CSMA-CA

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

Proceedings of the IEICE General Conference 2010 ( 2 ) 620 - 620 2010.3

B-5-18 Performance of multimode receivers dependent on frequency responce of Hilbert transformer and equalization of the responce

Homma Hiroaki, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 1 ) 450 - 450 2010.3

B-5-40 Complexity Reduced Decoding For Virtual Layered Space Time Receivers

Ohnishi Ryota, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 1 ) 472 - 472 2010.3

B-5-17 A Study on Necessary Bit Number of A/D Converter for Multi-mode Receivers with Baseband AGC

Liu Ke, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 1 ) 449 - 449 2010.3

B-5-52 The Improvement Scheme for Complexty-Reduced Multi-Band MMSE-MIMO Receiver

Tamaoki Masahiro, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 1 ) 484 - 484 2010.3

B-5-39 Performance of the Iterative Virtual Channel Detection for MIMO-OFDM Systems

Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 1 ) 471 - 471 2010.3

B-5-47 Lattice-Reduction aided MMSE Receiver with Virtual Channel Estimation for MIMO Spatial Multiplexing

Yoshikawa Shogo, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

Proceedings of the IEICE General Conference 2010 ( 1 ) 479 - 479 2010.3

B-21-16 Effects of RTS/CTS on Long Distance Access with CSMA/CA

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

Proceedings of the IEICE General Conference 2010 ( 2 ) 666 - 666 2010.3

B-21-17 Throughput Analysis of Wireless Multihop CSMA/CA System with Network Coding

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

Proceedings of the IEICE General Conference 2010 ( 2 ) 667 - 667 2010.3

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

IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

IEICE technical report 109 ( 341 ) 95 - 100 2009.12

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 propose a soft input iteration scheme for improvement of this architecture. The performance of the proposed architecture is verified using computer simulations.

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Configulation and Performance of Multiband MIMO-MMSE Receiver

TAMAOKI Masahiro, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

IEICE technical report 109 ( 341 ) 101 - 106 2009.12

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 of MIMO receiver which enable multiband reception. It can simultaneously signal devision and cancel image-band interference. We adopt analogue Hilbert transformers to cancel image-band interference and MMSE criterion to devide MIMO signals. 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, scheme of complexity reduction can be appeared.

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Throughput Optimization by Contention Window Control in CSMA/CA Network Coding

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

IEICE technical report. Information networks 109 ( 276 ) 47 - 52 2009.11

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

In this paper, a network coding method in which a QoS control is incorporated is proposed to improve the system throughput of a two-hop wireless CSMA/CA relay network. In the case of non-QoS control, when many terminal stations transmit their data frames to each other via only one relay station, the wireless channel is dominated by the uplink from the terminal stations to the relay station. As a result, it deteriorates the system throughput because the relay station can hardly obtain the transmission right on such a wireless channel, and the wireless link from the relay station to the terminal stations will become a bottleneck. As a solution of this phenomenon, we propose the method of modifying the minimum contention window size in the relay station to provide its transmission priority. Furthermore we show that the proposed method improves the system throughput both with and without network coding by computer simulation.

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Thoroughput Evaluation of One-to-Many Wireless Relay ALOHA Network Coding Incorporating Link Budget

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

IEICE technical report. Information networks 109 ( 276 ) 59 - 64 2009.11

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 clarify 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 one-to-many information sharing via the relay node. As a result, the throughput performances of one-to-many information sharing systems via the relay mode 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 Relay Packet Transmission Control Scheme for Multihop Wireless ALOHA Network Coding

TANAKA Masaaki, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report. Information networks 109 ( 276 ) 53 - 58 2009.11

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

Wireless access systems employing wireless relay nodes have been studied for removing degital devides and blind zone areas. On the other hand, network coding is a highly regarded technology to enhance the system throughput and to decrease the delay for wireless relay networks. In this manusprict, we propose a packet collison avoidance scheme for the relay nodes in which predetermined slots are assigned to the relay nodes to avoid any packet collisons between relay nodes. We evaluate throughput and delay of the coding packet transmission control schemes with the proposed packet collison avoidance scheme, and show that the proposed schemes can achieve lower delay as compared with the conventional schemes when throughput is higher. Also, we show that the poposed schemes can update higher throughput and lower delay by adapting the parameters of the proposed schemes to the previous throughput.

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RTS/CTS Effect on Two-Hop Wireless CSMA Network Coding

UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report. Information networks 109 ( 276 ) 65 - 70 2009.11

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 the previous presentation, we evaluated the throughput in both cases of non-hidden end nodes and hidden end nodes via the relay node for two-hop wireless relay systems, in which all nodes employ CSMA (Carrier Sense Multiple Access) protocol, both without and with network coding. In this manuscipt, we investigate the effect of the RTS/CTS (Request To Send/Clear To Send) mechanism on throughput in case of hidden end nodes via the relay node by applying the PPDU (PLCP Protocol Data Unit) frame format, the IFS (Interframe Space) time, and the slot time of IEEE802.11a, where PLCP is the abbreviated form of Physical Layer Convergence Protocol. As the analytical result, we clarify that the high conding gain can be achieved by RTS/CTS and network coding regardless of the increase of the overhead.

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Performance Evaluation of Network Coding in Two-Hop Wireless CSMA Systems

UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

IEICE technical report 109 ( 189 ) 29 - 34 2009.9

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 throughput in two-hop wireless access systems, in which nodes employ CSMA (carrier sense multiple access) protocol, both without and with network coding. As a result, we clarify a design criterion on transmit probability of the relay node to maximize the throughput and investigate the coding gain of the systems with network coding against those without network coding. In particular, we evaluate the performances without and with hidden nodes and estimate the affect on throughput degradation due to hidden node problem.

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B-5-7 Improvement of Error Estimation Accuracy of Hilbert Transfer for Multi-mode Receivers with Baseband AGC

Liu Ke, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2009 ( 1 ) 356 - 356 2009.9

B-8-33 An Improvement of Code Rate Optimization for Bit Loaded OFDM in Power Line Communications

Yabuuchi Yasuhiro, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

Proceedings of the Society Conference of IEICE 2009 ( 2 ) 174 - 174 2009.9

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