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직교부호에 의한 논코히어런트 위성 DS-CDMA 시스템 성능분석
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- Issue Date
- 2000-09
- Citation
- 한국통신학회지, v.25, no.9, pp.1322-1331
- ISSN
- 1226-4725
- Publisher
- 한국통신학회 (KICS)
- Language
- Korean
- Type
- Journal Article
- Abstract
- In this paper, we compare the performance of noncoherent DS-CDMA system where orthogonal code is used for identifying the user to reduce multiple access interference or for M-ary orthogonal signaling to improve the performance of demodulation. The effects of M-ary orthogonal signaling on the noncoherent demodulation is investigated and compared with one of coherent demodulation. The analysis results show that M-ary orthogonal signaling gives better performance than quasi-synchronous orthogonal scheme for a moderate number of users when the processing gain is 128 over AWGN channel. In addition, when the number of user is 41, M=64 orthogonal signaling has a similar performance to the quasi-synchronous orthogonal scheme at the BER of 10-2 when the time misalignment between channels is within 1/2 chip and M=256 orthogonal signaling always outperforms the quasi-synchronous orthogonal scheme. Start after striking space key 2 times.
- KSP Keywords
- AWGN channel, DS-CDMA system, Direct-sequence code-division multiple-access(DS-CDMA), M-ary, Multiple access interference(MAI), Non-coherent demodulation, Number of users, Orthogonal code, Orthogonal signaling, Processing gain, Time Misalignment