一种OFDM系统利用预编码进行峰均比降低的算法

An algorithm for PAPR reduction in OFDM system by means of pre-coding

为了降低OFDM系统峰均比,本文提出了一种低复杂度的预编码方案。该方案利用快速傅立叶变换取代原始方案中的乘法操作,极大地降低了计算复杂度。在此低复杂度方案的基础上,给出了一个基于通用平方根升余弦的预编码矩阵。理论分析和计算机仿真结果表明,与原始预编码算法相比,本文提出的方案具有更好的峰均比降低性能,同时计算复杂度有极大的降低。

In order to reduce PAPR for OFDM system, this paper proposes a low complexity pre-coding scheme. The fast Fourier Transform （FFT） is used in the proposed scheme to replace the multiplying operation in the original pre-coding scheme, which greatly reduces the computational complexity. Based on this low complexity scheme, a pre-coding matrix with generalized square root raised cosine is given. Theoretical analysis and computer simulation results show that, compared with the original pre-coding algorithm, the proposed scheme has better PAPR reduction performance, and the computational complexity is greatly reduced.