Analysis and Improvement of BDFE Algorithm for DTMB Standard

In this paper, a novel block decision feedback equalizer (BDFE) algorithm suitable for Chinese digital terrestrial television multimedia broadcasting (DTMB) standard is presented. The filter coefficients of the BDFE are calculated subject to the QR factorization and are updated once for each data block. The QR decomposition can be accomplished via fast Givens rotation which is more effective without square roots. Decisions can be made on the various unknown symbols as they are analyzed and then fed back via back substitution. The performance of overlap and add frequency-domain equalization (OLA-FDE) algorithm, traditional decision feedback equalization (DFE) algorithm, and BDFE algorithm under different SNRs is compared by MATLAB simulation, which proves the advantages of BDFE algorithm.