降低MC-CDMA峰均功率比的SLM压扩联合算法

SLM-companding algorithm for reducing the PAPR of MC-CDMA

针对多载波码分多址(MC-CDMA)系统的高峰均功率比(PAPR)的问题,提出一种将选择性映射(SLM)算法与压扩技术相级联的新算法,该算法首先利用SLM算法对系统PAPR特性优化;然后对幅度大于给定门限的信号进行压缩,实现对系统峰均功率比的进一步有效降低.仿真结果表明,SLM压扩联合算法能够最大限度地利用现有算法的优势,在很好地降低PAPR的同时,又不会引入很大的计算量和压扩噪声.

In view of the PAPR problem in MC-CDMA,a combined algorithm is proposed,which combines the advantages of the SLM and companding transform.The proposed method uses SLM scheme to improve the PAPR performance frist,and then the partial compression is used to reduce the PAPR valne greatly.Simulation results show that the combined algorithm can reduce the PAPR efficiently,and has lower computational complexity and companding noise as well.