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．
