认知无线电中OFDM信号联合参数估计  

Joint Parameters Estimation of OFDM Signals in Cognitive Radio

作　　者：蒋清平[1,2] 杨士中[1] 张天骐[2] 

机构地区：[1]重庆大学通信与测控中心,重庆400030 [2]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《北京邮电大学学报》2011年第2期131-135,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(10776040);重庆邮电大学青年基金项目(A2007-19)

摘　　要：提出了一种基于循环自相关函数实现正交频分复用(OFDM)信号参数联合估计的算法.该算法只需在相应切面上搜索峰值距离就可实现OFDM信号的码片时间、有用符号时间、符号周期参数的联合估计.并在低信噪比条件下,用频域累积法计算OFDM信号循环自相关函数.计算机仿真结果验证了新算法的有效性.A joint parameters estimation algorithm for orthogonal frequency division multiplexing （OFDM） signals was presented based on cyclic autocorrelation function（CAF）. Joint estimation of the chip time, the symbol time and symbol useful time parameters of OFDM signals can be realized with the algorithm only by searching the distance between the peaks in the corresponding plane. And a method based on frequency domain accumulation for calculating the CAF of OFDM signals was adopted in low signal noise ratio. The validity of the algorithm was proved by simulations.

关 键 词：认知无线电 循环自相关函数 盲信号处理 正交频分复用 

分 类 号：TN911.3[电子电信—通信与信息系统]