短波OFDM信号调制参数估计算法研究  

Modulation Parameter Estimation Algorithm for HF OFDM Signal

作　　者：付哥佳 段田东 刘瑞东 徐文艳[1] 

机构地区：[1]信息工程大学信息系统工程学院,河南郑州450002

出　　处：《信息工程大学学报》2012年第6期688-694,共7页Journal of Information Engineering University

基　　金：国家科技重大专项资助项目(2011ZX03003-003-002)

摘　　要：结合正交频分复用(OFDM)信号二阶循环特性,针对短波中OFDM信号参数估计这一重要问题,对基于循环自相关函数截面的OFDM信号参数估计算法进行了修正,推导了估计码元速率参数时谱峰的搜索范围,增加了其算法的子载波带宽估计功能。根据修正算法得到子载波带宽,确定小波尺度因子,基于OFDM信号功率谱的等波纹特性,利用小波方法对OFDM信号实际使用子载波个数的倒谱估计方法进行了改进。实验结果表明,这两种算法估计OFDM信号参数时具有良好性能。Using the special characteristic of 2-th cyclic cumulants, the Orthogonal Frequency Divi- sion Multiplexing （OFDM） signal parameter estimation method based on the cross-section of the cy- clic autocorrelation function （CAF） was modified. Besides, the range of the peak search for symbol rate parameter estimation was deduced and its sub-carrier bandwidth estimation function was added. Then the wavelet scale factor can be deduced with the estimated sub-carrier bandwidth parameters. Based on the ripple characteristic of the OFDM signal power spectrum, a wavelet method was pro- posed to modify the estimation method of the real subcarrier number. Simulation results show that the two modified algorithms perform well for OFDM signal parameters estimation.

关 键 词：正交频分复用 循环自相关 小波变换 参数估计 

分 类 号：TN919.3[电子电信—通信与信息系统]