MC-CDMA信号子载波参数盲估计

摘要

为解决多载波码分多址(MC CDMA)信号子载波参数估计问题,提出四阶循环累积量算法.利用MC-CDMA信号子载波之间的正交性,对信号的每一路子载波分别求其四阶循环累积量,进行累加求出信号的四阶循环累积量,估计出MC-CDMA信号的子载波数目和子载波频率间隔.通过分析单载波信号的四阶循环累积量,估计单载波信号的载波频率,进一步识别出MC-CDMA信号和单载波信号.仿真结果表明,该算法在较低信噪比下可以有效估计MC-CDMA信号的子载波参数和单载波信号的载波频率.%To solve the subcarrier parameter estimation problem in multi carrier-code division multiple access MC-CDMA) signal,the fourth-order cyclic cumulants method was proposed.Using the orthogonality between subcarriers of the MC-CDMA signal,the fourth-order cyclic cumulants was obtained for each subcarrier of the signal,and the fourth-order cyclic cumulants of the signal was accumulated.The number of subcarriers and the subcarrier frequency interval of the MC-CDMA signal were estimated.Based on the analysis of the fourth-order cyclic cumulants of the single carrier signal,carrier frequency of the signal was estimated.The MC-CDMA signal and the single carrier signal were identified.The simulation results show that the proposed algorithm can effectively estimate the subcarrier parameters of the MC-CDMA signal and the carrier frequency of the single carrier signal at lower signal-to-noise ratio.