Adaptively Varying Modulus Blind Equalization Algorithm Using Fractionally-Spaced Equalizer

摘要

A new blind equalization scheme for QAM systems is proposed, which is referred to adaptively varying modulus algorithm based on SCA (AVSCA). The AVSCA changes the SCA from single modulus to multi-modulus for the characteristics of the QAM systems and then adapts the zeroerror contours adaptively according to the decision of the equalizer output. Simulation using a fractionally-spaced equalizer for a typical voice-band communication channel and a practical microwave channel is evaluated to compare the proposed algorithm with the CMA, GSA and SCA. Theoretical analysis and simulation results demonstrate that AVSCA improves equalization performance by increasing the convergence speed and decreasing the residual inter-symbol interference.