Spreading Code Assignment for Multicarrier CDMA System over Frequency-Selective Fading Channels(Terrestrial Radio Communications)
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概要
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In multicarrier code division multiple access (MC-CDMA) systems, the orthogonality among the spreading codes is destroyed because the channels exhibit frequency-selective fading and the despreading stage performs gain control ; that is, inter-code interference (ICI) can significantly degrade system performance. This paper proposes an optimum spreading code assignment method that reflects our analysis of ICI for up and downlink MC-CDMA cellular systems over correlated frequency-selective Rayleigh fading channels. At first, we derive theoretical expressions for the desired-to-undesired signal power ratio (DUR) as a quantitative representation of ICI ; computer simulation results demonstrate the validity of the analytical results. Next, based on the ICI imbalance among code pairs, we assign specific spreading codes to users to minimize ICI (in short, to maximize the multiplexing performance) ; our proposed method considers the quality of service (QoS) policy of users or operators. We show that the proposed method yields better performance, in terms of DUR, than the conventional methods. The proposed method can maximize the multiplexing performance of a MC-CDMA cellular system once the channel model, spreading sequence, and combining strategy have been set. Three combining strategies are examined at the despreading stage for the uplink, equal gain combining (EGC), orthogonality restoring combining (ORC), and maximum ratio combining (MRC), while two are considered for the downlink, EGC and MRC.
- 2004-12-01
著者
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ARAKI Kiyomichi
Tokyo Institute of Technology
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SHONO Takashi
the NTT Network Innovation Laboratories, NTT Corporation
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Sasase I
Keio Univ. Yokohama‐shi Jpn
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Sasase Iwao
The Department Of Information And Computer Science Keio University
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Sasase Iwao
Department Of Information And Computer Science Keio University
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Yamada Takefumi
Wireless Laboratories Ntt Docomo Inc.
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Yamada T
Univ. Tsukuba Tsukuha‐shi Jpn
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Sasase Iwao
The Faculty Of Science And Technology Keio University
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Shono T
Ntt Corp. Yokosuka‐shi Jpn
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Shono Takashi
Ntt Network Innovation Laboratories Wireless Systems Innovation Laboratory
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Kobayashi Kazutoshi
Graduate School Of Informatics Kyoto University
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Yamada Tomoyuki
The Ntt Network Innovation Laboratories Ntt Corporation
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Kobayashi Koji
Yamatake Corporation
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Kobayashi K
Kyoto Univ. Kyoto‐shi Jpn
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Kobayashi K
Yamatake Corporation
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YAMADA Tomoyuki
NTT Network Innovation Laboratories, NTT Corporation
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KOBAYASHI Kiyoshi
NTT Network Innovation Laboratories, NTT Corporation
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ARAKI Katsuhiko
NTT Network Innovation Laboratories, NTT Corporation
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Araki Katsuhiko
Ntt Network Innovation Laboratories Ntt Corporation
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Kobayashi Kiyoshi
Ntt Network Innovation Laboratories
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