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.