宽带自适应波束形成子带实现方法

Subband Method for Wideband Adaptive Beamforming

提出一种基于通用参数滤波器组的宽带自适应波束形成子带实现方法.宽带接收信号经分析滤波器组分成若干子带信号,每个子带信号经各自的子带阵列处理器处理后由综合滤波器组恢复成宽带信号.因子带信号工作在更低的采样速率下,且每个子带信号处理器并行工作.有效降低了算法计算量.提高了阵列处理器效率.结果表明。与传统宽带处理方法相比,此子带方法除了输出信号均方误差略有增加外。能有效提高权值收敛速度。显著增强干扰抑制能力;与使用同样通道数目的正交镜像滤波器组的子带方法相比,该方法进一步提高了干扰抑制能力并可减小均方误差.

A subband method with general-parameter-filter banks （GPFB） for wideband array adaptive beamforming is proposed. The received wideband signal is divided into multiple subband signals by the analytical filter bank. Each of the subband signals is then fed into its corresponding subband array processor, of which the outputs are combined by the synthesis filter bank and recovered into wideband signal. As subbands are running at down-sampling rate and in parallel manner, the loads of computational processing can be effectively alleviated, and the efficiency of array improved. The simulation results show that the convergence speed of weights and deep suppression of the interference are enhanced with the subband method except for a little worse mean square error （MSE） of the output signal. In addition, compared to the subband method using quadrature-mirror-filter （QMF） banks with the same number of channels, this method possesses a superior ability of interference suppression, and it is also capable of reducing the MSE significantly.