Pilot Channel Assisted MMSE Combining in Forward Link for Broadband OFCDM Packet Wireless Access(Special Section on Multi-dimensional Mobile Information Networks)
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概要
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This paper proposes a pilot channel assisted minimum mean square error (MMSE) combining scheme in orthogonal frequency and code division multiplexing (OFCDM) based on actual signal-to-interference power ratio (SIR) estimation, and investigates the throughput performance in a broadband channel with a near 100-MHz bandwidth. In the proposed MMSE combining scheme, the combining weight of each sub-carrier component is accurately estimated from the channel gain, noise power, and transmission power ratio of all the code-multiplexed channels to the desired one, by exploiting the time-multiplexed common pilot channel in addition to the coded data channel. Simulation results elucidate that the required average received signal energy per bit-to-noise spectrum density ratio (E_b/N_0) for the average packet error rate (PER) = 10^<-2> is improved by 0.6 and 1.2dB by using the proposed MMSE combining instead of the conventional equal gain combining (EGC) in a 24-path Rayleigh fading channel (exponential decay path model, maximum delay time is approximately 1 μsec) in an isolated cell environment, when the number of multiplexed codes = 8 and 32, respectively, with the spreading factor of 32. Furthermore, when the average received E_b/N_0 = 10dB, the achievable throughput, i.e., the number of simultaneously multiplexed codes for the average PER = 10^<-2> in the proposed MMSE combining, is increased by approximately 1.3 fold that of the conventional EGG.
- 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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Atarashi Hiroyuki
Wireless Laboratories, NTT DoCoMo, Inc.
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MAEDA Noriyuki
Radio Access Network Development Department, NTT DOCOMO, INC.
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ATARASHI Hiroyuki
Radio Access Network Development Department, 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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ABETA Sadayuki
IP Radio Network Development Department, NTT DoCoMo, Inc.
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Abeta Sadayuki
Wireless Laboratories, NTT DoCoMo, Inc.
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Abeta S
Ip Radio Network Development Department Ntt Docomo Inc.
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Abeta Sadayuki
Wireless Laboratories Ntt Docomo Inc.
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Maeda Noriyuki
Radio Access Network Development Department Ntt Docomo Inc.
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Maeda N
Department Of Medical Biochemistry And Coe Program In The 21st Century School Of Pharmaceutical Scie
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Atarashi Hiroyuki
Radio Access Network Development Department Ntt Docomo Inc.
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Atarashi H
Faculty Of Science And Technology Keio University:(present Address) Ntt Mobile Communications Networ
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Atarashi Hiroyuki
Wireless Laboratories Ntt Docomo Inc.
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MAEDA Noriyuki
Wireless Laboratories, NTT DoCoMo, Inc.
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