Combined Effect of Coherent Adaptive Antenna Array Diversity and SINR-Based Fast Transmit Power Control 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 evaluates through laboratory and field experiments the combined effect of the coherent adaptive antenna array diversity (CAAAD) receiver and signal-to-interference plus background noise ratio (SINR)-based fast transmit power control (TPC) in order to improve performance beyond that of space diversity (SD) with maximal ratio combining (MRC) in all low-to-high signal-to-interference power ratio (SIR) channels in the W-CDMA reverse link. Although the previously proposed CAAAD receiver comprising an adaptive antenna array based on the minimum mean square error (MMSE) criterion and a coherent Rake combiner was very effective in suppressing interference in low SIR(interference is severe) channels, SD employing MRC in noise limited channels (high SIR) outperformed the CAAAD because of its uncorrelated reception of fading variation due to its large antenna separation. The laboratory experimental results showed that the required average transmit signal energy per bit-to-background noise spectrum density (E_b/N_0) with the CAAAD receiver using fast TPC is lower than that with an SD receiver over a wide range of maximum Doppler frequency values from f_D = 5Hz to 500Hz in a low-to-high SIR channel. The results of the field experiments also showed that combining CAAAD and fast TPC is a powerful means to reduce severe multiple access interference (MAI) from high rate users in a low-to-high SIR environment and is more effective than using the SD receiver with the same number of antennas, i.e., the measured BER was improved by approximately one order of magnitude, when the relative transmit power of the desired user was 8 dB with two antennas at the average received SIR at the antenna input of-12dB.
- 社団法人電子情報通信学会の論文
- 2001-03-01
著者
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IHARA Taisuke
Wireless Laboratories, NTT DoCoMo, Inc.
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SAWAHASHI Mamoru
Wireless Laboratories, NTT DoCoMo, Inc.
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TANAKA Shinya
Wireless Laboratories, NTT DoCoMo, Inc.
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Tanaka Shinya
Wireless Laboratories Ntt Docomo Inc.
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Adachi F
Tohoku Univ. Sendai‐shi Jpn
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Tanaka S
Wireless Laboratories Ntt Docomo Inc.
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ADACHI Fumiyuki
the Department of Electrical and Communications Engineering, Graduate School of Engineering, Tohoku
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Harada A
Ntt Docomo Inc. Yokosuka‐shi Jpn
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HARADA Atsushi
Wireless Research Laboratories, NTT DoCoMo, Inc.
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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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Tanaka S
Ntt Docomo Inc. Yokosuka‐shi Jpn
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Ihara T
Wireless Laboratories Ntt Docomo Inc.
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Ihara Taisuke
Wireless Laboratories Ntt Docomo Inc.
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Harada Atsushi
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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