一种减小峰均功率比的PTS算法优化技术研究

研究了多载波通信系统峰均功率比(PAPR)抑制技术之一——部分传输序列(PTS)算法的优化技术.通过在传统多载波系统中加入PAPR门限比较判决模块,实现对多载波系统时域信号中较大PAPR值的抑制.传统PTS算法计算量大,不易实现.提出的比较判决优化技术将减小PTS数据处理的次数,使系统在PAPR抑制过程中的计算量明显减少.通过仿真证明,该优化算法在门限值合理设置时,可以使运算量减小近70%.该优化算法即使在子载波教较大的系统中,对系统的误码率性能有所优化,且不增加系统的带外辐射.

Research on improved method of PTS algorithm on PAPR reduction

Partial transmit sequence (PTS) algorithm is one of traditional techniques for the reduction of the peak-to-average power ratio (PAPR) in multi-carries communication sys- tem,an improved method of the algorithm had been proposed in this paper.A PAPR thresh- old decision unit was added in traditional multi-carries system to reduce the larger PAPR val- ues for the time domain signals.Traditional PAPR algorithm needs complicated operations and large computations,so it is used scarcely by now.However,the improved method for PTS technique can lessen the number of PTS operations and it is superior to the traditional one in the aspect of calculation complexity.By simulation,it can be given that the improved method can cut down about 70% PTS operations on condition that a feasible PAPR thresh- old.Even though in a larger number of sub-carries system,proposed method has better bit error rate (BER) performance still can not make the increase and out-band power spectrum re-growth.