频率选择性衰落信道下STBC-SC-FDE系统的信道频率响应估计

摘要

针对频率选择性衰落信道下2发1收STBC-SC-FDE系统收发两端的信号编码与处理结构,应用系统的频率域输入-输出模型,设计了一种最小二乘信道频率响应(Channel frequency response,CFR)估计算法.对算法均方误差的分析表明,采用Chu序列作为最优训练序列不仅能够实现CFR估计的最小均方误差,而且能保证系统具有比较低的峰均功率比(Peak-to-average power ratio,PA/PR).该算法相比那些先估计信道时域响应(Channel impulse response,CIR)再转换为CFR的方法能够节省更多的计算资源.最后Monte Carlo仿真验证了该算法的性能.%The signal coding and processing scheme of the STBC-SC-FDE system is studied, which has two transmitting and one receiving antennus over frequency-selective fading channels. And a least-squares channel frequency response(CFR) estimation algorithm based on the input-output modal in frequency domain is developed. The mean square error of the proposed algorithm is analyze. Results show that the algorithm is not only able to achieve the minimum mean square error for channel estimation, but also to make a communication system with a relative low peak-to-average power ratio(PAPR) by using the Chu sequences as its optimal training sequences. For SC-FDE systems, the proposed algorithm can save more computing resources than those algorithms that firstly estimate channel impulse response (CIR) and then transfer it to frequency domain. Finally, the performance of the proposed algorithm is evaluated by Monte Carlo simulations.