Performance Improvement of M-ary CSK by Using a Code Set Having Low Auto- and Cross-Correlation Properties in Multipath Fading Channels

Hiroaki NAKAZIMA  Masaaki HARADA  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.6   pp.1532-1534
Publication Date: 2007/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.6.1532
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
code shift keying,  auto-correlation,  cross-correlation,  multipath fading,  

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The performance of M-ary code shift keying (CSK) in multipath fading channels is analyzed in this letter. In conventional spread spectrum (SS) systems, which employ a single spreading code, the interference due to the delay signal depends on the auto-correlation property of the spreading code. In CSK, since one code is selected from a code set that contains multiple codes, the effect of the delay signal differs from that for conventional SS systems. Analytical results reveal that, in the multipath fading channel, the error rate of CSK depends on the cross-correlation property with the other codes in addition to the auto-correlation of transmitted code.