Comparative Evaluation between Parallel Combinatory CDMA and Direct Sequence CDMA for High Speed Radio Communication(Special Section on Fundamentals of Multi-dimensional Mobile Information Network)
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概要
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Comparative performance evaluation between parallel combinatory CDMA(PC-CDMA) and Direct Sequence CDMA(DS-CDMA) has been conducted for high speed radio communication up to 2 Mbps under a multipath Rayleigh fading environment. For both DS-CDMA and PC-CDMA, user information rate per code of 128 kbps, convolutional code with 1/2 coding rate, the same bit interleaving and QPSK data modulation are applied to get transmission symbol rate of 128 ksps. The chip rate of 4.096 Mcps is used to investigate the possibility of 2 Mbps transmission using only 5 MHz bandwidth. So the spreading factor of the spreading code is 32 for DS-CDMA. In PC-CDMA, 128 ksps data stream is divided into four 32ksps data streams and according to the every four bits pattern, corresponding spreading code of spreading factor of 128 and its polarity are selected out of eight candidate spreading codes. In soft decision Viterbi decoding applied to PC-CDMA, branch metric is calculated for every bit by weighting the output levels of the PC-CDMA correlators for eight candidate spreading codes. By computer simulation under vehicular environment model with six multipaths, it has been shown that PC-CDMA can offer more capacity approximately by double than DS-CDMA for both downlink and uplink under the condition such as for vehicular for BER of 10^<-3>, and 2 Mbps transmission per cell for downlink is possible not only in isolated cell condition but also in omni cell condition by PC-CDMA.
- 社団法人電子情報通信学会の論文
- 1998-07-25
著者
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HOMMA Koichi
Department of Communication and Network Engineering, Tokai University
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Hayashi M
Tokyo Univ. Pharmacy And Life Sci. Tokyo
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Uesugi M
Panasonic Mobile Communications Co. Ltd. Yokosuka‐shi Jpn
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Homma K
Telecom Research Laboratory Matsushita Communication Industrial Co. Ltd.
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Homma Koichi
Department Of Communication And Network Engineering Tokai University
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Hayashi M
Kddi R&d Laboratories Inc.
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KATO Osamu
Telecom Research Laboratory, Matsushita Communication Industrial Co., Ltd.
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HOMMA Koichi
Telecom Research Laboratory, Matsushita Communication Industrial Co., Ltd.
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HAYASHI Masaki
Telecom Research Laboratory, Matsushita Communication Industrial Co., Ltd.
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UESUGI Mitsuru
Telecom Research Laboratory, Matsushita Communication Industrial Co., Ltd.
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Kato O
Japan Metals And Chemicals Co. Ltd. Iwate Jpn
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Hayashi Masaki
Graduate School Of Science And Technology Chiba University
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