Path Search Performance and Its Parameter Optimization of Pilot Symbol-Assisted Coherent Rake Receiver for W-CDMA Mobile Radio (Special Section on Spread Spectrum Techniques and Applications)
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概要
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In DS-CDMA (including W-CDMA), a received signal can be resolved into multiple paths to be Rake combined. An important design problem of the Rake receiver is how to accurately search the paths with a sufficiently large signal-to-interference plus background noise power ratio (SIR). This paper investigates the performance of a coherent Rake receiver using pilot symbol-assisted channel estimation with fast transmit power control, and thereby optimizes three key parameters: the total averaging period, T_<avg>, consisting of a combination of coherent summation and power summation; each period of the summations for measuring the average power delay profile; and path selection threshold M from the generated power delay profile. We used a path search algorithm, which searches the paths that have M times greater average signal power than the interference plus background noise power measured in the average power delay profile generated using time-multiplexed pilot symbols. It was clarified by both simulation and laboratory experiments that when M = 4, T_<avg> = 50-100msec, and the number of slots for coherent accumlation R = 2, the required average transmit E_b/N_0 for obtaining the average BER of 10^<-3> is almost minimized with and without antenna diversity for both ITU-R Vehicular-B and average equal power L-path delay profile model, in which each path suffered independent Rayleigh fading. The paper also shows that based on the field experiments, the path search algorithm with optimized path-selection parameters is robust against actual dynamic changes in the power delay profile shape.
- 社団法人電子情報通信学会の論文
- 2000-11-25
著者
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HIGUCHI Kenichi
Wireless Laboratories, NTT DoCoMo, Inc.
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SAWAHASHI Mamoru
Wireless Laboratories, NTT DoCoMo, Inc.
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Adachi F
Tohoku Univ. Sendai‐shi Jpn
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Adachi Fumiyuki
Department Of Electrical And Communications Engineering Graduate School Of Engineering Tohoku Univer
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Adachi Fumiyuki
Wireless Laboratories Ntt Mobile Communications Network Inc.: Presently Electrical And Communication
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Okawa K
Wireless Research Laboratories Ntt Docomo Inc.
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Okawa Koichi
Wireless Laboratories Ntt Do Como Inc.
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Higuchi K
Wireless Research Laboratories Ntt Docomo Inc.
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Higuchi K
Department Of Electrical Engineering Tokyo University Of Science
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Higuchi Kenichi
Ip Radio Network Development Department Ntt Docomo Inc.
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FUKUMOTO Satoru
Wireless Research Laboratories, NTT Mobile Communications Network, Inc.
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Fukumoto S
Ntt Docomo Inc. Yokosuka‐shi Jpn
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Sawahashi Mamoru
Wireless Laboratories Ntt Do Como Inc.
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Adachi Fumiyuki
Denartment Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Univers
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Adachi Fumiyuki
The Graduate School Of Engineering Tohoku University
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Adachi Fumiyuki
R&d Department Ntt Mobile Communications Network Inc.
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Higuchi Kenichi
Wireless Laboratories Ntt Docomo Inc.
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Fukumoto Satoru
Wireless Laboratories Ntt Docomo Inc.
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Adachi Fumiyuki
Wireless Lab. Ntt Docomo Inc.:department Of Electrical Communications At Graduate School Of Engineer
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