Concurrent Modified Square Contour Algorithm and Soft Decision-Directed Scheme for Blind Equalization

A new blind equalization scheme is proposed based on concurrent modified square contour algorithm (MSCA) and a novel soft decision-directed (SDD) adaptation. This proposed blind equalization scheme (MSCA+SDD) may be viewed as operating a MSCA equalizer and a SDD equalizer concurrently. The MSCA term provides good steady- state equalization performance and global convergence, moving the equalizer weight vector on the correct direction; after the equalizer enters the fine local convergence region, the SDD term helps to accelerate convergence. The performance is measured for realistic microwave channel models and the simulation results demonstrate that both the MSCA+SDD and the MSCA have the same steady-state equalization performance, but the former has a faster convergence speed.