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在基于空时分组编码正交频分复用的协作通信系统中,不同用户节点间存在的载波频偏会产生子信道间干扰与子信道内干扰.该文研究对抗这两种干扰的实用均衡方法.针对较小的归一化频偏差,提出一种实现迫零均衡的低复杂度迭代算法IAZF.针对较大的归一化频偏差,构造一种串行最小均方误差组间干扰消除与并行干扰消除联合的均衡算法JEA,并根据信道矩阵的近似带状结构,实现了均衡所需的矩阵求逆的递推计算,节省了计算量.仿真结果表明:在相当大的归一化频偏差范围内,JEA的性能稳健,特别是在归一化频偏差大于0.25时明显优于现有方法.在归一化频偏差小于0.15时,IAZF提供了逼近其他方法的性能且复杂度更低.
In the cooperative communication system based on Space-Time Block Coded Orthogonal Frequency Division Multiplexing (OFDM), subcarrier interference and intrachannel interference exist in carrier frequency offset existing between different user nodes.This paper studies the practical countermeasures against these two kinds of interference Aiming at the smaller normalized frequency deviation, a low complexity iterative algorithm IAZF for zero-forcing equalization is proposed. For a larger normalized frequency deviation, a series of least-mean-squared error And the parallel interference cancellation algorithm JEA, and according to the approximate strip-shaped structure of the channel matrix, the recursive calculation of the matrix inversion required for equalization is realized, which saves the computational load. The simulation results show that, in a relatively large normalization The performance of JEA is stable within the range of frequency deviation, especially when the normalized frequency deviation is greater than 0.25. When the normalized frequency deviation is less than 0.15, IAZF provides more approximate performance and more complexity than other methods low.