正交频分复用系统存在较高的峰均比,介绍了峰均比产生的原理和降低峰均比值的部分传输序列算法,分析了算法性能和目前存在的问题,提出了一种预置固定扰码的PTS算法,该方法通过将固定扰码序列的边带信息预置在优化处理之前,使边带信息作为待优化数据源的一部分优化,这种方法消除了传统PTS中边带信息产生的峰均比值对系统的二次影响.通过仿真分析证明了将边带信息前置的PTS方法在算法复杂度较低的情况下,能有效减少边带信息带来的附加峰均比值的影响.%One of the major drawbacks of orthogonal frequency division multiplexing systems is the high peak-to-average power ratio (peak-to-average ratio), the principle of peak-to-average ratio generated and the PTS (Partial Transmit Sequences) algorithm for reducing the peak-to-average ratio value are introduced, the performance of algorithm and the present existent question are analyzed. One kind of PTS algorithm which preset the fixed scrambler is proposed, the method preset the side information of fixed scrambler sequence before optimized processing, the side information are optimized as the part of data source, the second influence of peak-to-average ratio value which the side information produced in the traditional PTS is eliminated by this method. The analysis of simulation has proven that the method of presetting side information can reduce effectively the influence of additional peak-to-average ratio value which the side information bring with low computational complexity.
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