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Frequency Domain Scrambling Code Allocation for MC-CDMA Based Communication Systems  

Kim, Houng-Soo (한국전자통신연구원 전파방송연구단 방송시스템연구그룹 지상파전송기술연구팀)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.1A, 2007 , pp. 44-50 More about this Journal
Abstract
In typical MC-CDMA systems, different frequency-domain scrambling codes are randomly chosen from a given code set and then assigned to different subscriber stations using the same subcarrier set. When orthogonal codes are employed for the frequency-domain scrambling, the choice of the scrambling code does not affect the detection performance if the timing and frequency synchronizations are perfect and the channel characteristic is flat. However, in practical cases, inter-code interference often appears due to the broken code orthogonality. In this paper, the optimal order of allocating the orthogonal frequency-domain scrambling codes to new subscriber stations is derived under non-negligible timing offsets in MC-CDMA system.
Keywords
MC-CDMA; scrambling codes; timing offset; Walsh-Hadamard codes; Inter-code interference;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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