多波束自适应噪声抵消法引论

本文给出按Wiener最小均方差准则设计的两种噪声抵消系统模型。给出计算输出信噪比的一般表达式。提出了把这种模型用于自适应波束成形时的实际检验准则。
提出一种多波束自适应噪声抵消系统。分析了它的主要性能。
本文的全部讨论都在频域上进行,文中给出利用信号平均功率谱密度和最佳线性滤波器的传输函数计算系统指向性的方法。给出了多波束噪声抵消法在自适应前后的指向性公式。
实际的例子说明这种系统在抑制为数不多的干扰时具有很大的优越性。

AN INTRODUCTION OF MULTI-BEAM ADAPTIVE NOISE CANCELLING SYSTEM

Two noise cancelling models designed with Wiener criteria of least mean square are shown in this paper. The general formula for calculating output signal-to-noise ratio is presented and the practical test rule for adaptive beamforming which employ those models are given.
We give a multi-beam adaptive noise cancelling system. Analyse their important performances, compare with the other available multi-beam adaptive system.
All the evolution are considered in the frequency domain in this paper, we have given a method for calculating the function of directivity by using the mean power spectrum density of signal and optimum transfer function of system.
The directivity formula of multi-beam noise cancelling before and after adaptiving are given.
Some practical examples show the advantage of this model in suppressing interferences when the number of the interference are not many.