基于多速率滤波器组的UWB脉冲波束形成方法

Beamforming of UWB Pulses Based on Multi-rate Filter Bank

在UWB脉冲信号的角度分集接收中,通常的空时处理中通道时延不易精确地控制。该文提出一种适合UWB脉冲信号的基于多速率滤波器组的波束形成方法,避开了时域处理中延迟控制的问题,同时实现了大带宽范围内的均匀一致的频率不变阵列响应。本文具体分析了进行多速率滤波的方式,其优点是滤波器设计简单,运算量与子带数目无关,同时UWB脉冲信号处理的不连续性使得其可以采用比较简单的时域插值算法。仿真实验结果证明了该文方法的可行性和有效性。

In usual spatial-time processing for diversity reception of UWB pulses, the channel delays are not easy to be implemented accurately. This paper firstly discusses the principle of UWB pulse array beamfonning. Then a beamforming scheme is presented based on multi-rate filter bank, which is suitable for UWB pulse signals. The proposed method avoids the hardness of delays control in time domain, and can obtain the uniform frequency invariant array response in such a wideband for UWB signals. The way of realizing the multi-rate filtering is analyzed in detail, and it proves to be of easy design. Moreover, its computational cost is independent of the number of subbands, Additionally, the discontinuity of UWB pulse signals makes it possible to employ a relatively simple interpolation algorithm in time domain. The simulation results verified the feasibility and the effectiveness of this presented method,