Abstract:

According to the modified constant modulus algorithm (MCMA) s cold start ability and decision directed least mean square (DD-LMS) algorithms small residual error property, a dual mode blind equalization algorithm was introduced. With MCMA, the channel eye diagram would be opened and then switched to DD-LMS algorithm to decrease the residual error after convergence. The algorithm could be switched between MCMA and DD-LMS automatically according to the decision rule. Equalization output would be sent directly to the decision device without phase recovery operation so that it can simplify systems design and promote systems efficiency.

Key words: blind equalization, mean square error, symbol error rate