Some algorithms of variable step size LMS adaptive filtering are studied．The VS—LMS algorithm is improved．

Another new non-linear function between肛and e(／ t)is established．The theoretic analysis and computer

simulation results show that this algorithm converges more quickly than the origina1．Furthermore，better antinoise

property is exhibited under Low—SNR environment than the original one．-variable step size of a LMS daptive filtering are studied. The VS-LMS algorithm is improved. Another new non-linear function between anus and e (/ t) is established. The theoretic analysis and computer simulatio n results show that this algorithm converges mo 're quickly than the origina1. Furthermore, better antinoise property is exhibited under L ow- SNR environment than the original one.