Sequences for OFDM and Multi-Code CDMA : Two Problems in

Paterson, Kenneth G.

HP Development Company

关键词: OFDM;    CDMA;    PAPR;    sequences;    Golay;    Reed-Muller;   

RP-ID  :  HPL-2001-146

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

We study the peak-to-average power ratio (PAPR) problem for two different kinds of communications systems, Orthogonal Frequency Division Multiplexing (OFDM) and Multi-Code Code-Division Multiple Access (MC-CDMA). We describe a common coding theoretic approach to reducing the PAPR of both kinds of transmissions. In both cases, the classical Reed- Muller codes turn out to play a critical role. There is an intimate connection between Reed-Muller codes and Golay complementary sequences which can be exploited to produce codes suitable for OFDM. For MC- CDMA, it turns out that bent functions lead to transmissions with ideal power characteristics. In this way, the problem of finding good codes for OFDM and MC-CDMA can be closely related to some old and new problems in algebraic coding theory and sequence design. 26 Pages