Polynomial rooting based frequency offset estimation for MIMO OFDM systems

作     者：蒋雁翔 尤肖虎 高西奇 Jiang Yanxiang;You Xiaohu;Gao Xiqi

作者机构：东南大学移动通信国家重点实验室南京210096 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2008年第24卷第4期

页      面：397-401页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 081001[工学-通信与信息系统] 

基　　金：The National Natural Science Foundation of China(No.60702028) the National High Technology Research and Development Program of China(863Program)(No.2007AA01Z268) 

主　　题：MIMO OFDM frequency selective fading channels frequency offset estimation polynomial rooting 

摘      要：Based on the frequency domain training sequences, the polynomial-based carrier frequency offset （CFO） estimation in multiple-input multiple-output （ MIMO ） orthogonal frequency division multiplexing （ OFDM ） systems is extensively investigated. By designing the training sequences to meet certain conditions and exploiting the Hermitian and real symmetric properties of the corresponding matrices, it is found that the roots of the polynomials corresponding to the cost functions are pairwise and that both meger CFO and fractional CFO can be estimated by the direct polynomial rooting approach. By analyzing the polynomials corresponding to the cost functions and their derivatives, it is shown that they have a common polynomial factor and the former can be expressed in a quadratic form of the common polynomial factor. Analytical results further reveal that the derivative polynomial rooting approach is equivalent to the direct one in estimation at the same signal-to-noise ratio（SNR） value and that the latter is superior to the former in complexity. Simulation results agree well with analytical results.