Faculty Profiles - DENNO Satoshi

MISC - DENNO Satoshi

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Adaptive Antenna with Digital Decision Feedback to Microwave Stage Beamforming

OHIRA Takashi, GYODA Koichi, DENNO Satoshi

Proceedings of the Society Conference of IEICE 1999 ( 1 ) 407 - 408 1999.8

Modified Constant Modulus Algorithm : A Novel Algorithm for Adaptive Beamforming Based on Microwave Signal Processing

DENNO Satoshi, OHIRA Takashi

IEICE technical report. Antennas and propagation 99 ( 211 ) 15 - 22 1999.7

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

An adaptive array antenna based on combination of digital signal processing and micro-wave signal processing has been proposed, which makes both price and hardware scale of an adaptive array antenna system lower. This paper proposes novel algorithms such as "M-Power algorithm"and "M-CMA", which are suitable for the adaptive array antenna. These algorithm can control the antenna directivity pattern of the array-antena without monitoring the received signals fed from antenna elements. Moreover, M-CMA can also control the null of its directivity pattern. The beampatterns of the adaptive array antenna based on the two algorithm are verified in the equivalent low pass systems by computer simulations. Furthermore, the adaptive array antennas based on the adaptive algorithms are examined to have superior performance.

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Microwave Signal Processing Adaptive Beamforming and Electronically Steerable Passive Array Radiator Antenna

OHIRA Takashi, GYODA Koichi, DENNO Satoshi

IEICE technical report. Antennas and propagation 99 ( 211 ) 9 - 14 1999.7

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

An adaptive array concept with microwave signal processing is presented. The array weighting and signal combining are carried out on the microwave stage, while the decision and weight control are executed by DSP. Unlike conventional DBFs, it does not necessitate numbers of frequency converters and analog-to-digital converters but only one of each. The signal combining before A/D conversion offers 21 significantly wider dynamic range than DBFs. Also proposed hereby is a novel electronically steerable passive array radiator antenna or ESPAR antenna. Thanks to the varactor-loaded passive radiators, it offers full 360-degree beam steering, complete elimination of phase shifters, and single-port feeding.

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B-5-46 Stabilization of Order Extended QNFTF (Quasi-Normalized Fast Transversal Filter) Algorithm

DENNO Satoshi

Proceedings of the IEICE General Conference 1999 ( 1 ) 397 - 397 1999.3

Software Antenna [II] : How to identify the radio-environment, and then

KARASAWA Yoshio, INOUE Takashi, KAMIYA Yukihiro, DENNO Satoshi

Technical report of IEICE. RCS 98 ( 435 ) 7 - 12 1998.11

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

We have proposed a new concept of kaleidoscopic antenna, we call it "software antenna, " which pursues a realization of required performance under minimum software/hardware resources. The software antenna instantly reconfigures itself adapting its software and hardware to changes in the time-varying radio-environment. In this paper, we describe how to categorize the radio-environment which is one of the most important functions of the antenna. Relation between categorized envrionments and adaptive signal processing algorithms is discussed.

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Decision feedback adaptive arrays based on an order-extended Quasi-normalized FTF algorithm

DENNO Satoshi

Proceedings of the Society Conference of IEICE 1998 ( 1 ) 322 - 322 1998.9

Development of 3tap Adaptive MLSE Equalizer LSI

SHIRATO Yushi, KOBAYASHI Kiyoshi, DENNO Satoshi

Proceedings of the Society Conference of IEICE 1998 ( 1 ) 278 - 278 1998.9

Configuration and Performance of Adaptive Arrays based on an Order Extended Fast Algorithm

DENNO Satoshi

Technical report of IEICE. RCS 98 ( 159 ) 31 - 38 1998.6

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

A novel adaptive algorithm, "Order extended fast algorithm", is proposed that is suitable for adaptive arrays with decision feedback equalization which is indispensable for high speed mobile communication systems. The proposed algorithm has fast acquisition performance, since this algorithm gives a solution of least square estimation recursively as well as RLS(Recursive Least Squares) algorithm, basically. In spite of this, the proposed algorithm requires much less operational complexity than RLS algorithm because of its feature of updating a gainvector in contrast with updating a correlation matrix in RLS. As tap length of the adaptive array becomes larger, operational complexity reduction efficiency becomes higher. Finally, it is verified that the proposed algorithm can achieve fast convergence and have superior BER performance by computer simulations.

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Decision feedback adaptive array equalizer based on an order extended first transversal filter algorithm

DENNO Satoshi

Proceedings of the IEICE General Conference 1998 ( 1 ) 543 - 543 1998.3

Correlation Matrix Decomposition Algorithm for Adaptive Arrays with Decision Feedback Equalization

DENNO Satoshi

Technical report of IEICE. DSP 97 ( 582 ) 81 - 86 1998.3

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

A novel adaptive algorithm, "Correlation matrix Decomposition algorithm", is proposed that is suitable for adaptive arrays with decision feedback equalization.This algorithm has following characteristics, (1)to achieve first acquisition performance, (2)to have lower operational complexity than RLS(Recursive Least Square)algorithm.This algorithm is derived by decomposing an autocorrelation matrix of input signals and neglecting its crosscorrelation parts produced by signals fed from different antenna elements, when the normal equation is recursively solved.Performance of the algorithm is theoretically analyzed and tested by computer simulation to have good performance.

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Cofiguration and Performance of a divesity combining DFE for Mobile Communication at a User Rate of 512 kbit/s Transmission

SHIRATO Yushi, DENNO Satoshi, SAITO Yoichi

The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2) 81 ( 3 ) 248 - 250 1998.2

High Speed QVLMS (Quantized Variable-gain Least Mean Squares)-MLSE(Maximim Likelihood Sequence Estimation) Equalizer for Mobile Communications -

DENNO Satoshi, SAITO Yoichi

The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2) 81 ( 1 ) 10 - 18 1998.1

A Highspeed MLSE Equalizer LSI for Mobile Communication

SHIRATO Yushi, DENNO Satoshi, KOBAYASHI Kiyoshi, OGOSE Shigeaki

Technical report of IEICE. RCS 97 ( 266 ) 21 - 26 1997.9

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

A Highspeed MLSE(Maximum Likelihood Sequence Estimation) Equalizer LSI has been developed. The LSI offsets a degradation caused by delayed signal, in case the difference of the arrival time is within 1 symbol duration. It realizes 2 branch combining diversity reception. The LSI consists of 70k gates, and operates at the power supply voltage of 3.3V. Performance test under 2 ray Rayleigh fading condition using a 6.144Mbit/s-QPSK Modem shows that the LSI limits the floor of the Bit Error Rate lower than 10^<-5> and 10^<-6>, with and without diversity reception respectively. The performance test using 54.912Mbit/s-QPSK Modem shows the usefulness of the LSI at the higher speed communication. Power consumption of the chip, which is proportional to bit rate, is 170mW at the bit rate of 10Mbit/s.

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Performance of Anti-Multipath Techniques in Micro-Cellular Systems

DENNO Satoshi, HATTORI Takeshi

IEICE technical report. Antennas and propagation 97 ( 228 ) 35 - 40 1997.8

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

The performances of anti-multipath techniques such as a multibranch selection diversity, an adaptive array antenna and transversal combining decision Feedback equalizer(TC-DFE) are analyzed by computer simulation. The way to approximate the bit error rate functions of both the adaptive array antenna and the TC-DFE each of which has superior performance over delay dispersive channels are explained. According to a empirical equations of propagation parameters estimation and the above function, the equalization is more significant than array antennas in mobile communication systems with higher than 6Mbit/s.

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A Quadrature and Gain Error Compensation Circuit for a PSK Demodulator

YAMADA Tomoyuki, SHIRATO Yushi, DENNO Satoshi

Proceedings of the Society Conference of IEICE 1997 ( 1 ) 414 - 414 1997.8

Design and Performance of 32 kbit/s π/4-QPSK VLMS (Variable-gain Least Mean Squares) MLSE Equalizer

DENNO Satoshi, SAITO Yoichi

The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2) 80 ( 6 ) pp.483 - 491 1997.6

Performance of a 6Mbit/s Burst MODEM using an Adaptive Equalizer

DENNO Satoshi

Proceedings of the IEICE General Conference 1997 ( 1 ) 741 - 742 1997.3

A study on improving methods for the combining diversity DFE with mode switching

SHIRATO Yushi, DENNO Satoshi, SAITO Yoichi

Proceedings of the IEICE General Conference 1997 ( 1 ) 497 - 497 1997.3

Array combining DFE based on a order extended Fast-Kalman algorithm

DENNO Satoshi

Proceedings of the Society Conference of IEICE 310 - 310 1997

Design and Performance of 1.5Mbit/s VLMS(Variable-gain Least Mean Squares) - MLSE(Maximum Likelihood Sequence Estimation) Eqaulizer using FPGAs(Field Programable Gate Arrays)

DENNO Satoshi, SAITO Yoichi

IEICE technical report. Antennas and propagation 96 ( 304 ) 73 - 78 1996.10

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

In high speed digital mobile communication systems, techniques to combat ISI (inter-symbol-intereference) caused by the delay spread in fading channels are required to improve BER performance. We propose complexty reduction methods for an adaptive MLSE equalizer which is a strong candidate to limit the degradation from the ISI. The equalizer based on the proposed methods is developed using FPGAs (field Programmable Gate Arrays) and verified to be fabricated with about 40kgate transistors. The equalizer is experimentally evaluated to suppress BER floor below 10^<-5> and achieve 10dB implicit diversity gain in a multipath fading channel with delay spread equal to 650nsec and synchronize in 8 symbols.

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