一种改进的预留子载波降低OFDM系统峰均比的方法

Improved Method to Reduce PAPR by Tone Reservation in OFDM System

针对正交频分复用(OFDM)系统中所具有高峰均比(PAPR)问题,提出一种改进的预留子载波降低峰均比算法--受控修剪算法.该算法为了消减OFDM时域信号中的高峰值,首先在预留载波上产生消峰用的原始核,然后将原始核循环移位移到时域信号模的最大峰值处,从而抵消最大峰值,达到降低峰均比的目的.该方法消峰过程中不会导致误码率的增加,降低峰均比效果明显.仿真例子证明了该方法的有效性.

It is presented an improved reducing PAPR method called as controlled clipper method by tone reservation for the problem of high peak-to-average power ratio（PAPR） of Orthogonal Frequency Division Multiplexing（OFDM）.In order to cancel the high PAPR in time domain OFDM signal,the kernel is first formed on the reserved subcarriers.Then,the kernel is circularly shifted to the maximum peak value,which will be reduced.Bit error rate is not increased in the process,and the result is very obvious in PAPR reduction.The effectiveness of the proposed scheme is demonstrated by simulations.