降低OFDM系统高峰均功率比的方法研究

针对OFDM技术具有较高的峰均功率比（peak to average power ration,PAPR）这一主要缺点,提出一种控制OFDM载波信号衍生频谱的迭代算法,在降低系统高峰均功率比的同时,也降低系统的误码率.利用该算法对数据序列长度为64的OFDM信号进行仿真验证,随着迭代次数的增加,衍生频谱系数增大,系统平均功率增加,OFDM信号的峰值功率比得到一定的降低.

Method of reducing the peak to average power ratio of OFDM system

OFDM technology is the core technology of the fourth generation communication technology because of its anti-in- terference and anti frequency selective fading,but the high peak to average power ratio （PAPR） has been the inevitable de- fects. This paper presents a method to control the OFDM carrier signal derivative spectrum, reducing the peak to average power ratio, at the same time, reducing the bit error rate of the system. Finally, by using this algorithm, the data sequence length being 64 OFDM signal are tested by emulation. With the increase of the number of iterations, the derivative spec- trtun coefficient increases, the system average power increases, and the peak power ratio of OFDM signal is reduced.