基于线性变换降低OFDM系统中峰均功率比的方法  

A Scheme Based on Linear Transformation to Reduce PAPR in the OFDM Systems

作　　者：朱晓东[1] 朱光喜[1] 林沛[1] 

机构地区：[1]华中科技大学电子与信息工程系,湖北武汉430074

出　　处：《计算机工程与科学》2009年第7期109-111,共3页Computer Engineering & Science

基　　金：国家自然科学基金资助项目(60496315)

摘　　要：为降低OFDM系统中的峰均功率比(PAPR),本文提出了线性变换的方法。通过对输入序列进行逆傅里叶变换,减少序列的自相关性,从而降低了PAPR。如果将逆傅里叶变换后的信号与原始信号进行比较,并且选择PAPR较小的信号传输,可以进一步改善峰均功率比的性能。仿真结果表明,该方法不仅能大幅降低PAPR,而且不会引起误码率性能的下降和信号频谱的扩展。A linear transformation is proposed to reduce the peak-to-average power ratio （PAPR） in the OFDM systems. PAPR reduction can be obtained by performing the inverse discrete Fourier transform （IDFT） on the input sequence, which reduces the aperiodic autocorrelatiorL To further reduce PAPR, the original signal can be compared with the IDFT transformed signal, and the one with lower PAPR is selected for transmission. The simulation results show that the proposed scheme can obtain significant PAPR reduction without degrading the bit-error ratio and the spreading power spectrum.

关 键 词：正交频分复用 峰均功率比 逆傅里叶变换 误码率 

分 类 号：TP915.1[自动化与计算机技术]