Experiments on Adaptive Antenna Array Transmit Diversity in W-CDMA Forward Link(Special Section on Multi dimensional Mobile Information Networks)
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概要
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This paper proposes adaptive antenna array transmit diversity (AAA-TD) in the W-CDMA forward link with frequency division duplexing (FDD), based on adaptively-generated receiver antenna weights in the reverse link, which only track the changes in the average signal-to-interference power ratio (SIR) and direction of arrival (DOA) but with the calibration of the phase/amplitude variations of the parallel RF receiver/transmitter circuits corresponding to the number of array antennas. The laboratory and field experimental results exploiting AAA-TD are presented to show the strong multipath interference (MPI) suppression effect especially from high-rate users with large transmission power. Laboratory experiments elucidate that by using AAA-TD with four antennas, the required transmitted SIR before multiplying the transmitter antenna weights at the average BER of 10^<-3> is decreased by approximately 13 dB compared to that with one omni-directional antenna transmitter. Field experiments also show that although an error floor above 10^<-2> is observed with one omni-directional antenna transmitter when the transmitted SIR is -12dB due to severe MPI, no error floor is observed when employing 4-antenna AAA-TD and the loss of the required received signal power at the average BER of 10^<-3> from the single-user case is suppressed to below approximately 5dB. Therefore, we show that AAA-TD is very effective in suppressing severe MPI especially from high rate users with large transmission power due to its adaptive main lobe and null steering.
- 社団法人電子情報通信学会の論文
- 2002-07-01
著者
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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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Harada A
Ntt Docomo Inc. Yokosuka‐shi Jpn
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HARADA Atsushi
Wireless Research Laboratories, NTT DoCoMo, Inc.
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ADACHI Fumiyuki
Denartment of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku Unive
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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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Harada Atsushi
Wireless Laboratories Ntt Docomo Inc.
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