Method and apparatus to automatically control a step size of...

Details Method and apparatus to automatically control a step size of... Method and apparatus to automatically control a step size of...

H - Electricity

04

B

H04B 1/16 (2006.01) H04B 7/005 (2006.01) H04L 27/01 (2006.01)

Patent

CA 2508383

A method and apparatus to automatically control a step size of a least mean squares (LMS) equalizer. An optimal step size can be selected by checking a signal to noise ration (SNR) of the LMS equalizer output according to a change in the step size. The LMS equalizer includes a step size decision block, which makes a relatively large change to the step size within predetermined upper and lower limits, and checks the SNR of the LMS equalizer output according to the change made to the step size. If the SNR becomes greater than a certain value, the step size is again adjusted with a higher precision to select an optimal step size in a given channel environment. Further, the LMS equalizer is capable of selecting an optimal tap coefficient within a shorter period of time, and a hardware system used to implement the apparatus to automatically control the step size is simple, yet optimized in a given channel environment.

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