OFDM/OQAM系统中基于BEM信道模型的盲载波频偏估计算法  

Blind carrier frequency offset estimation for OFDM/OQAM systems based on BEM

作　　者：赵宇[1] 陈西宏[1] 薛伦生[1] 

机构地区：[1]空军工程大学防空反导学院,陕西西安710051

出　　处：《系统工程与电子技术》2016年第6期1435-1439,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(61172169)资助课题

摘　　要：针对时频双选衰落信道下基于交错正交幅度调制的正交频分复用(orthogonal frequency division multiplexing with offset quadrature amplitude modulation,OFDM/OQAM)系统的频率同步问题,将双选信道建模为复指数基扩展模型,证明了存在载波频偏情况下OFDM/OQAM接收信号的二阶循环平稳特性,在此基础上,提出一种OFDM/OQAM系统载波频率偏差的盲估计算法。理论分析和仿真结果表明由该方法构造的估计器不仅能够有效地抵抗双选信道引起的衰落而且具有很好的抗噪性能,从而可以实现对载波频偏的稳健估计。The problem of frequency synchronization in orthogonal frequency division multiplexing with off- set quadrature amplitude modulation （OFDM/OQAM） systems over time and frequency doubly-selective fading channels is considered in this paper. By approximating the doubly-selective channel with the basis expansion model （BEM）, the second-order cyclostationarity property of the received signal in the presence of carrier frequency offset （CFO） is proved. Then, a blind CFO estimation algorithm is proposed based on the cyclostationarity. Theoretical analyses and simulation results show that performance as it is immune to the effect of noise and the proposed blind estimator can provide robust CFO estimation the fading caused by the doubly-selective channel.

关 键 词：正交频分复用 交错正交幅度调制 载波频偏估计 基扩展模型 

分 类 号：TN92[电子电信—通信与信息系统]