Experiments on Inter-Sector Diversity Using Maximal Ratio Combining in W-CDMA Reverse Link(Special Section on Spread Spectrum Techniques and Applications)
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概要
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This paper evaluates the effect of inter-sector diversity with maximal ratio combining(MRC)coupled with coherent Rake combining and 2-branch antenna diversity reception in the transmit-power-controlled wideband direct sequence code division multiple access(W-CDMA)reverse link. We first elucidate based on laboratory experiments that the required average transmit signal energy per bit-to-background noise spectrum density ratio(E_b/N_o)at the average bit error rate(BER)of 10^<-3> with inter-sector diversity using two sectors is decreased by approximately 1.4, 1.0, and 0.2dB compared to that with inter-cell site diversity using two cell sites with antenna diversity reception due to the superiority of MRC to selection combining(SC), when the difference in the average path loss between a base station(BS)and a mobile station(MS)is Δ_<12> =0, 3, and 6dB, respectively. We also clarify in actual Geld experiments that the inter-sector diversity associated with Rake time diversity and antenna diversity further decreases the required average transmit power of a MS if the number of resolved paths is small such as 1 or 2 in each sector reception, even when the fading correlation between sectors is relatively large. Furthermore, we show that the required average transmit power of a MS for satisfying the average BER of 10^<-3> with inter-sector diversity is decreased above approximately 2.0-2.5dB compared to that with one-sector reception, owing to the significantly increased inter-sector diversity effect in addition to the Rake time diversity and antenna diversity, when the fading correlation averaged over the measurement course is approximately 0. 7.
- 社団法人電子情報通信学会の論文
- 2001-12-01
著者
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MORIMOTO Akihito
Radio Access Network Development Department, NTT DOCOMO, INC.
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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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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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FUKUMOTO Satoru
Wireless Research Laboratories, NTT Mobile Communications Network, Inc.
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ADACHI Fumiyuki
the Department of Electrical and Communications Engineering, Graduate School of Engineering, Tohoku
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MORIMOTO Akihito
Wireless Laboratories, NTT Do CoMo, Inc.
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Fukumoto S
Ntt Docomo Inc. Yokosuka‐shi Jpn
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Sawahashi Mamoru
Department Of Electrical Engineering Tokyo University Of Science
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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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Higuchi Kenichi
Department Of Electrical Engineering Tokyo University Of Science
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Morimoto Akihito
Radio Access Network Development Department Ntt Docomo Inc.
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Fukumoto Satoru
Wireless Laboratories Ntt Docomo Inc.
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Adachi Fumiyuki
The Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Uni
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