A New Variable Tap-Length LMS Algorithm and Application in Fixed Satellite Communications

A new variable tap-length LMS algorithm is proposed in this paper. This algorithm can effectively obtain both fast convergence rate and small steady state error by non-linear weighting L errors of the current moment and past moments. The algorithm analysis is also given which the ideal tap-length is obtained by increasing the error information and eliminating the effect of correlated noise sequences. Then the new algorithm is applied to the fixed satellite communications system in which the channel is affected by weather conditions attenuation and multipath effect. Simulation results are presented to support the analysis. The new algorithm converges faster than usual algorithms under same steady state performance. The signal BER performance is greatly improved with the new adaptive filter algorithm equalizer when the signal passes simulation model of fixed satellite communications system.