Low Complexity Crest Factor Reduction for Forward Link CDMA using IQ Offset

Forward link code division multiple access (CDMA) signals generally have large crest factors, giving rise to low power efficiency of the transmission system. Crest factor reduction (CFR) for forward link CDMA is called for to improve the system power efficiency. In this paper, we propose a CFR algorithm that reduces the probability of simultaneous occurrences of high peaks between the in-phase and the quadrature branches. The proposed algorithm is distortionless, offers good CFR capability with little modification to the existing system and has low computational complexity. Simulation results are provided to demonstrate the performance of the proposed CFR technique.