分组并行自适应时域均衡滤波器设计

A Design of Adaptive Time-domain Equalization Filter Based on Packet Parallel Processing

为解决空地高速通信电台系统信道中的多径效应,选用时域均衡滤波器,把均衡器设计成对信道响应可调整的自适应滤波器。首先,为解决高阶自适应均衡器运算量大的问题,达到更好的抗多径效果,对自应滤波器进行了分组并行的处理,以资源的消耗换取均衡速率的提高,利用多速率信号处理理论,把原先集中的采样点分散到各组当中。再者,把m序列应用到递推最小二乘算法中,发挥算法收敛速度快的优势,同时尽量减少运算量,使算法能很好地应用到硬件实现当中去。最后,在性能分析上进行了改善,把均衡与Turbo纠错码级联起来,减小系统误码率,仿真结果显示改进达到预期目标,对实际空地高速通信电台系统中的均衡实现具有重要的参考价值。

To solve the multi-path effects in the channel of air-to-ground high-speed communication radio system,the time domain equalizer filter with lower complexity than frequency domain equalizer selected is and the equalizer is designed to be a adaptive filter which can adjust to the channel response.Firstly,in order to solve the large amount of computation of higher order adaptive filter,and achieve better resistance to multipath effects,the adaptive filter is designed into packet parallel processing,with the consumption of resources in exchange for the improvement of the equalization rate.According to multi-rate signal processing theory,the original concentration of sampling points are distributed to each group to achieve a better equalization effects.Furthermore,the m-sequence is applied to recursive least squares algorithm,playing the convergence speed advantage while minimizing the computation.The algorithm can be well applied to the hardware implementation.Finally,the performance analysis is improved,and the equalization and turbo error-correcting codes are cascaded,reaching the purpose of gaining lower bit error rate.The simulation results achieved the expected goals,which has important reference value to the actual equalization of air-to-ground high-speed communication radio system.