用改进的星座图扩展法降低OFDM信号峰均功率比  

Reducing the OFDM peak-to-average power ratio with improved constellation extension

作　　者：房海东[1] 潘长勇[1] 杨知行 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第10期1373-1376,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为降低正交频分复用(OFDM)信号的峰均功率比,提出了改进的星座图扩展方法。改进的算法采用压缩扩张变换方法的部分概念,在不减小星座点间欧氏距离的约束条件下,动态地向外扩展传输数据的星座点,从而降低OFDM信号的峰均功率比。该方法在接收机端不需要任何的处理过程,而且没有边带信息。改进的星座图扩展方法能够取得的峰均功率比比原来方法的低约1 dB,而且简单实用。The peak-to-average power ratio of orthogonal frequency division multiplexing （OFDM） systems is reduced with an improved constellation extension scheme. The improved algorithm dynamically extends the outer constellation points in data-carrying channels while not reducing the Euclidean Distance between constellation points. This scheme does not need any processing at the receiver and requires no side information. The improved constellation extension achieve about 1 dB extra peak-to-average power ratio reduction compared with the traditional constellation extension.

关 键 词：正交频分复用 多载波通信 星座图扩展 峰均功率比(PAPR) 

分 类 号：TN929.5[电子电信—通信与信息系统]