摘要
分析了OFDM系统中高PAPR对系统通信质量的损害,研究了经典的几种抑制峰均功率比的方法并着重介绍了限幅法。其基本思想是预定限幅门限,对OFDM信号包络超过门限的部分直接削除。OFDM信号虽然最大峰值功率很高,但其出现的概率很低,因此,限幅法可以有效抑制信号峰均比。对限幅降低峰均功率比进行了研究,讨论了OFDM调制技术中的过采样问题,利用MATLAB软件完成了对所有研究内容的仿真并进行了分析。
The damage of high PAPR （ peak - to - average power ratio） to the OFDM （ Orthogonal Frequency Di- vision Multiplexing） system is analyzed in this paper. Some of the classical PAPR reduction techniques are discussed, and an especial attention is focused on the clipping technique. The essence of clipping technique is to set a limit, if OFDM signals＇ peak values are higher than the limit, the over components will be clipped directly. Though OFDM signals＇ peak power is high, their emergence of probability is very small, so the clipping technique for PAPR reduction has been proved to be effective. In this paper, the clipping technique for PAPR reduction was investigated, the over - sampling issue in OFDM was discussed and simulations were made for all the results by MATLAB.
出处
《计算机仿真》
CSCD
北大核心
2010年第2期369-372,共4页
Computer Simulation
关键词
正交频分复用
抑制峰均比
限幅
OFDM modulation
Peak -to -average power ratio reduction
Clipping technique
