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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。
In this paper, two models of noise cancellation system designed according to the Wiener minimum mean square error criterion are given. The general expression for calculating the output signal-to-noise ratio is given. The actual test criterion when using this model for adaptive beamforming is proposed. A multi-beam adaptive noise cancellation system is proposed and its main performance is analyzed. All the discussions in this paper are carried out in the frequency domain. In this paper, a method of calculating the directivity of the system by using the signal average power spectral density and the optimal linear filter transfer function is given. The multi-beam noise cancellation method is presented before and after the adaptation Sex formula. The actual example shows that this system has a great advantage in suppressing a small number of interference.