Optimum and Suboptimum Code Allocation for Peak Power Reduction in Down-Link MC CDMA

Kwonhue CHOI  Jiyu JIN  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.11   pp.3389-3393
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3389
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2008)
peak power,  PAPR,  MC-CDMA,  OFDM,  satellite communications,  

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We develop an optimum code allocation scheme by investigating the peak to average power ratio (PAPR) characteristic of a down-link multi-carrier (MC)-CDMA system using Walsh-Hadamard code. It is shown that PAPR of a MC-CDMA system is highly dependent upon the selection of code combination. Based on this fact, we develop the allocation method which minimizes PAPR according to the number of active users. In addition, an efficient suboptimum code combination search scheme is also proposed for near minimum PAPR.