Faculty Profiles - DENNO Satoshi

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Performance Analysis of Algorithms for Adaptive Array Antennas in Cochannel Interference Environment

SAKAGUCHI Shogo, DENNO Satoshi, MORIHIRO Yoshiteru

IEICE technical report. Antennas and propagation 105 ( 126 ) 13 - 18 2005.6

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

To suppress cochannel interference and receive desired transmitted signals properly, adaptive array antennas is so useful technique. In control algorithms of adaptive array antennas, algorithms that minimize its cost function mean square error have been studied and it has been shown that these algorithms can suppress interference waves less than receive antennas. But recent study suggested more appropriate algorithms that minimize its cost function BER (bit error rate). These algorithms are mainly suggested for binary phase shift keying. In this paper, I propose AMBER and LBER for quadreture phase shift keying and verify the effectiveness of the proposed algorithms in cochannel interference environment through computer simulations.

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Joint Signal Processing of Image-band Interference Cancel and Code Acquisition in Multimode Receivers

FURUKAWA Tomoya, DENNO Satoshi, MORIHIRO Yoshiteru

Technical report of IEICE. RCS 105 ( 88 ) 47 - 52 2005.5

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

Multimode receivers which can receive signals of many systems get the attention, because it enables to reduce the size of terminal. In this paper, we propose a constitution method of multimode receiver which uses heterodyne system. We employe SS (Spread Spectrum) system which used in the third-generation mobile communication system. In general, the miniaturization of RF (Radio Frequency) architecture is important issue because multimode receiver needs system specific RF architecture. When we deploy RF band BPF (Band Pass Filter) in the receiver, we cannot receive all RF signal. Because of this, we propose a new architecture which implement blind signal processing of image-band interference cancel and code acquisition without RF band BPF. This architecture is confirmed in the presence of CIR (Carrier to Interference Ratio)=-40dB.

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A-5-27 An Optimal Decoding for LDPC Codes over Impulsive Noise Channels

NAKAGAWA Hiroki, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru

Proceedings of the IEICE General Conference 2005 143 - 143 2005.3

B-5-245 Channel Allocation Algorithms for Mesh-Type FWA System Using Real-world LOS Data

IZUMI Keita, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru, UCHIDA Daisei

Proceedings of the IEICE General Conference 2005 ( 1 ) 694 - 694 2005.3

B-5-99 Multibeam Interference Cancellation for Space Time Block Code

Denno Satoshi, Morihiro Yoshiteru

Proceedings of the IEICE General Conference 2005 ( 1 ) 548 - 548 2005.3

A-5-29 An SS-CSK Modulation Using Extended M-Sequence for Power Line Communications

MASHINO Jun, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru

Proceedings of the IEICE General Conference 2005 145 - 145 2005.3

Delayed Decision Feedback Sequence Estimation for Multibeam Interference Cancellation

Denno Satoshi

Proceedings of the Society Conference of IEICE 2001 ( 1 ) 443 - 443 2001.8

Maximum Likelihood Sequence Estimation for Multibeam Interference Cancellation

DENNO Satoshi

Technical report of IEICE. RCS 101 ( 91 ) 9 - 15 2001.5

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

This paper proposes a maximum likelihood sequence cstimatkm (MLSE) in multibeam interference cancellation over CCI (Co-channel interference) channels. A likelihood function which is essential in MLSE is derived in multichannel systems which consist of radio propagation channels and space time multibeam arrays although a certain requirement is needed through the derivation. To estimate the maximum likelihood sequence in any conditions such as mobile communication channels, the beam forming criterion which satisfies the requirement is described. In addition, it is shown that the noise variance existing in the likelihood function can be estimated. The performance of the proposed scheme, a multibeam interference with MLSE, is verified by computer simulation that has superior BER performance to the single beam space time adaptive array and better performance by 2〜3 dB than the multibeam interference canceller with hard decision over CCI channels in mobile communication systems.

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Robust Image frequency Interference Canceller in Multimode Receivers

Denno Satoshi

Proceedings of the IEICE General Conference 2001 ( 1 ) 516 - 516 2001.3

Verification of an Array Signal Processing Unit with Algorithm Diversity for Software Antennas

FURUHI Tomoshige, DENNO Satoshi, OHIRA Takashi

Proceedings of the IEICE General Conference 2001 ( 1 ) 99 - 99 2001.3

Multibeam Interference Cancellation based on Multibeam Order Extended Fast Algorithm

DENNO Satoshi

Technical report of IEICE. RCS 100 ( 561 ) 37 - 44 2001.1

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

This paper proposes a novel multibeam interference canceller which can achieve high transmission performance in multiuser environments over mobile communication channels. In addition to this, multibeam order extended fast algorithm for the multibeam interference canceller is proposed that can be implemented with less computational complexity than RLS (Recursive Least Squares) algorithm. In spite of the little computational complexity, the proposed algorithm attains rapid initial acquisition same to RLS algorithm. Although the multibeam interference canceller has several kind of tap vectors which define the directivity patterns of the multibeam, the multibeam interference canceller based on the multibeam order extended fast algorithm can estimate these tap vectors through only one Kalman gain vectors update. This is why the multibeam interference canceller based on the multibeam order extended fast algorithm can be implemented with little computational complexity. The the multibeam interference canceller based on the multibeam order extended fast algorithm achieves the rapid convergence same to theoretical upper bound and has superior performance by 6dB to the conventional decision feedback adaptive array.

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Multibeam Interference Canceller Based on Order Extended Fast Algorithms

Denno Satoshi

Proceedings of the Society Conference of IEICE 2000 ( 1 ) 292 - 292 2000.9

An MLSE Equalizer LSI Performance on 100Mbit/s Transmission

SHIRATO Yushi, KOBAYASHI Kiyoshi, DENNO Satoshi

Proceedings of the IEICE General Conference 2000 ( 1 ) 539 - 539 2000.3

A Trial Production of Array Signal Processing Unit with Algorithm Diversity for Software Antenna

FURUHI Tomoshige, DENNO Satoshi, MIZUGUCHI Yoshihiko

Proceedings of the IEICE General Conference 2000 ( 1 ) 170 - 170 2000.3

A CMA Adaptive Array for CDMA Which Despreads Spread Spectrum Signals

Kamiya Yukihio, Denno Satoshi, Mizuguchi Yoshihiko, Katayama Masaaki, Ogawa Akira

Technical report of IEICE. SST 99 ( 628 ) 133 - 138 2000.2

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

The application of adaptive arrays is widely paid attention. Although its application to CDMA systems has been considered intensively, spatial signal processing achieved by an adaptive array and dispreading of received signals were accomplished separately. The authors proposed an adaptive array which achieves two different types of signal processing, mentioned above, simultaneously based on CMA. However, it can not work in multi-user system, even though the proposed scheme achieves full-blind signal processing, . In this paper, we propose to employ the proposed scheme in CDMA multi-user system by setting a spreading code as an initial weight of CMA. The performance under fading environment is examined through computer simulations.

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Development of an adaptive array based on subband signal processing

Kamiya Yukihiro, Denno Satoshi, Mizuguchi Yoshihiko, Katayama Masaaki, Ogawa Akira, Karasawa Yoshio

Technical report of IEICE. SST 99 ( 628 ) 125 - 132 2000.2

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

Adaptive arrays are recognized as a solutin to overcome multipath fading environments that can be serious problem in high-speed mobile communication systems. Particularly, adaptive arrays based on subband signal processing achieve efficient signal processing due to its parallel configuration. In this paper, an adaptive array based on subband signal processing is implemented by using DSPs and its performance is verified through experiments in an anechoic chamber. Finally, computational loads of adaptive arrays are examined and it is shown that the implemented adaptive array realizes very efficient signal processing.

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マルチシステム受信機におけるイメージ周波数信号干渉の補償法

田野哲

信学技報 67 - 73 2000

M-CMA(Modified Constant Modulus Algorithm) Adatpive Array with Equalization Based on Digital Signal Processing

DENNO Satoshi, OHIRA Takashi

Technical report of IEICE. RCS 99 ( 356 ) 97 - 103 1999.10

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

Adaptive arrays have been proposed in which microwave analog beamforming and adaptive control are combined, in order to reduce both a complexity and a cost of an adaptive array. Besides, adaptive arrays based on spatial and temporal signal processing is known to be effective in high speed mobile communication systems such as mobile multimedia communication systems, since transmitted signals has to suffer from severe multipath fading. Therefore, this paper describes how to extend the adaptive arrays with microwave bcamforming to those based on spatial and temporal signal processing. In addition, it is proposed to apply M-CMA to adaptive arrays with microwave beamforming based on spatial and temporal signal processing.

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A Novel CMA Adaptive Array Applicable to DS-SS Systems

KAMIYA Yukihiro, DENNO Satoshi, MIZUGUCHI Yoshihiko, KATAYAMA Masaaki, OGAWA Akira, KARASAWA Yoshio

IEICE technical report. Antennas and propagation 99 ( 267 ) 13 - 18 1999.8

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

Adaptive arrays have been paid attention widely as an attractive solution for multipath fading in the mobile communication systems. Although many configurations of the adaptive array and adaptive control shiemes are proposed, its complexity prevents it from practical use. In this paper, we propose novel configuration of the adaptive array which acheives beamforming, equalization and despreading simultaneously based on CMA algorithm applicable to one-user Spread Spectrum communication systems. It is expected that it allows us to implement easily due to its simple configuration. The performance is examined through computer simulations.

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M-CMA (Modified Constant Modulus) algorithm : A Novel Algorithm for Adaptive Beamforming based on Microwave Signal Processing

DENNO Satoshi, OHIRA Takashi

Proceedings of the Society Conference of IEICE 1999 ( 1 ) 401 - 402 1999.8

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