An equalization algorithm for CMMB systems over fast fading channels

A modified basis expansion (BE) model of time-varying channels is proposed, and a channel equalization algorithm based on the frequency-domain pilot tone for Chinese mobile multimedia broadcasting (CMMB) systems is also proposed. In the proposed algorithm, the scattered pilots in frequency domain are used to estimate the channel values on the midpoint of the symbol duration, other channel values are exactly fitted by BE models. Therefore, the received sequences can be equalized in time domain. Considering the errors induced by the ICI, an iterative feedback method is proposed to restrain them. Simulation results show that the proposed algorithm has remarkable improvement comparing with the traditional LS estimation and linear interpolation algorithms over fast fading channels.