Experiments on Inter-Cell Site Diversity Using Two-Step Selection Combining in W-CDMA Reverse Link(Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21^<st>Century)
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概要
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This paper proposes an inter-cell site diversity scheme based on 2-step selection combining (SC) and investigates through experimentation the effect of inter-cell site diversity in the transmit power-controlled wideband direct sequence code division multiple access (W-CDMA) reverse link. In the proposed algorithm, the decoded data sequence after soft-decision Viterbi decoding at each base station (BS) is transferred via the backhaul(wired line between BS and radio network controller (RNC) simulator) to the RNC simulator accompanied by reliability information of cyclic redundancy check (CRC) results per frame and the average signal-to-interference power ratio (SIR) calculated over the interleaving interval. The 2-step SC for each frame is performed at the RNC simulator using these two types of reliability. information. We conclude from the laboratory experiments that the transmit power of a mobile station (MS) can be decreased since the selection period, T_<SEL>is shorter irrespective of the interleaving length, T_<ILV>and that the required transmit power of a MS satisfying the average BER of 10^<-3> in inter-cell site diversity among 2 and 3 cell sites can be decreased by approximately 1.0(0.5)dB and 1.3(0.7)dB for fading maximum Doppler frequency f_D = 5(80)Hz, respectively, compared to a one-site connection (T_<ILV>=80msec, T_<SEL> =msec, path loss difference between 2 BSs and MS is 0 dB). We also confirmed by field experiments that the required transmit power of a MS in inter-cell site diversity between 2 cell sites can be decreased by approximately 2.0 dB compared to that of a one-site connection.
- 社団法人電子情報通信学会の論文
- 2001-03-01
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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MORIMOTO Akihito
Wireless Laboratories, NTT Do CoMo, Inc.
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ADACHI Fumiyuki
the Graduate School of Engineering, Tohoku University
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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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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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