单载波通信系统的迭代频域合成均衡算法

摘要

为提高符号间干扰(ISI)信道条件下信号接收的可靠性，该文研究单载波通信系统的多天线空间分集接收问题，提出一种迭代频域合成均衡算法。该算法推导先验信息条件下合成均衡器的频域传输函数，并借助快速傅里叶变换(FFT)实现合成均衡器系数和均衡滤波的高效计算。仿真结果表明，相比时域算法，该算法能够在不损失性能的前提下，大幅降低运算复杂度。与单载波频域均衡(SC-FDE)算法相比，该算法不需要在数据传输的结构中插入循环前缀(CP)，提高频谱利用率，能够直接应用于现有单载波通信系统。%To combat the effect of InterSymbol Interference (ISI) while transmitting data over wireless fading channels, the issue of single carrier communication signal receiving with multiple antennas is studied and an iterative frequency domain combining equalization algorithm is proposed. The proposed algorithm derives the theoretical frequency domain transfer function of the combining equalizer witha prioriinformation. An efficient implementation is proposed which employs the Fast Fourier Transform (FFT) to compute the combining equalizer coefficients and equalization filter. Numerical results show that the proposed algorithm reduces complexity enormously with nearly no performance loss compared with the time domain algorithm. Compared with Single Carrier Frequency Domain Equalization (SC-FDE), the Cyclic Prefix (CP) overhead can be avoided, and the computationally efficient frequency domain algorithm can be applied to the existing single carrier communication systems.