A Fast Transmit Power Control Based on Markov Transition for DS-CDMA Mobile Radio
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概要
- 論文の詳細を見る
On the reverse (mobile-to-base) link of direct sequence code division multiple access (DS-CDMA) mobile radio, closed-loop fast transmit power control (TPC) must be sufficiently fast to track fast multipath fading. However, in urban areas, the line-of-sight (LOS) path may appear abruptly when a mobile station appears from behind a building and later suddenly the LOS may disappear, resulting in an abrupt path-loss change in the order of 30 to 40 dB. This "on-off" path loss change can be considered as a special case of shadowing. This "on-off" shadowing causes two problems at the base station: generation of severe multiple access interference (MAI) to other users when the LOS path appears and degradation of the quality of its own signal when the LOS path disappears. This paper proposes a new closed-loop fast TPC based on Markov-state transitions (called Markov fast TPC). State transition is determined by the past history of the received binary TPC commands sent from the base station. The TPC step size is associated with each state. By changing the step size between as small as 0.8 dB and as large as 4 dB, the Markov fast TPC can better track "on-off" shadowing as well as multipath fading compared to conventional one-state closed-loop fast TPC. A new SIR estimation method used in TPC command generation is also proposed. The TPC error is evaluated by computer simulation to demonstrate the adaptability of the proposed Markov fast TPC in a Rayleigh fading channel superimposed by "on-off" shadowing.
- 社団法人電子情報通信学会の論文
- 1999-08-25
著者
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Adachi Fumiyuki
Wireless Laboratories Ntt Mobile Communications Network Inc.: Presently Electrical And Communication
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Kawai Hiroyuki
Radio Access Network Development Department Ntt Docomo Inc.
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SUDA Hirohito
Wireless Laboratories, NTT Mobile Communications Network Inc.
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Kawai Hiroyuki
Wireless Laboratories Ntt Mobile Communications Network Inc.
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Kawai H
Gunma Univ. Kiryu‐shi Jpn
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Suda Hirohito
Wireless Laboratories Ntt Docomo Inc.
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Kawai Hiroyuki
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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SUDA Hirohito
Wireless Laboratories, NTT Mobile Communications Network, Inc.
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