一种基于OPTS的降低OFDM峰均比的低复杂度算法

An OPTS-based Low Complexity Algorithm for Reducing OFDM PAPR

正交频分技术最主要缺点之一就是传输信号的高峰均值功率比,部分传输序列法是解决高峰均值功率比的最有效方法之一。虽然最优部分传输序列方法性能很好,但其计算复杂度非常大,搜索复杂度随着子块数指数增加,这样降低搜索复杂度显得尤为重要。本文改进了OPTS搜索过程中计算时域矢量的计算方法,使其计算复杂度大大降低,但系统性能不受影响。

One of the major drawbacks of orthogonal frequency division multiplexing （OFDM） is the high peak-to- average power ratio （PAPR） of the transmitted signal. Partial transmit sequences scheme is one of the most effective methods to resolve the problem of high PAPR. Although the performance of the optimum partial transmit sequence （OPTS） scheme is very good, the computational complexity is too large, which increases exponentially with the number of sub-blocks. So, it is obviously important to reduce the computational complexity. In this paper, a computational method using OPTS is presented to improve the computation of time domain vectors. This method reduces the computational complexity greatly, but the PAPR performance of the OFDM system is still unvaried.