Radio Link Capacity Comparison between MC/DS-CDMA and MC-CDMA in Reverse Link Broadband Wireless Access(Special Section on Multi-dimensional Mobile Information Networks)
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概要
- 論文の詳細を見る
This paper compares the radio link capacity between multi-carrier/DS-CDMA (MC/DS-CDMA) and multicarrier CDMA (MC-CDMA) for reverse-link broadband packet wireless access taking into consideration: the asynchronous signal reception at the receiver; the path timing or symbol timing detection of all major subject factors; and the channel estimation error. Simulation results show that although the influence of the asynchronous signal reception on the packet error rate (PER) performance in MC-CDMA is slight, the degradation caused by the channel estimation error in MC-CDMA is severe compared to that caused by the path timing detection error in MC/DS-CDMA. Consequently, the required average received signal energy per bit-to-background noise spectrum density ratio (E_b/N_0) at the average PER of 10^<-2> in MC/DS-CDMA is reduced by approximately 4.5dB compared to that in MC-CDMA assuming a 12-path exponential decayed Rayleigh fading channel. Furthermore, the number of accommodated users in MC/DS-CDMA is 2.5 fold greater than that in MC-CDMA employing two-branch antenna diversity reception. Therefore, we conclude that MC/DS-CDMA is more appropriate than MC-CDMA for the reverse link broadband packet wireless access, and that it has advantageous features such as an inherently much lower peak-to-average power ratio compared to MC-CDMA, which accompanies a high peak-to-average power ratio causing an increase in the back-off of the power amplifier.
- 社団法人電子情報通信学会の論文
- 2003-07-01
著者
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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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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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SUWA Shingo
Wireless Laboratories, NTT DoCoMo, Inc.
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Suwa Shingo
Wireless Laboratories Ntt Docomo Inc.
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