Syndrome Based Adaptive Complexity Channel Decoding and Turbo Equalization for ATSC DTV

To realize energy efficient broadcasting receivers the complexity of the applied algorithms should be adaptive, i.e. the number of required operations should decrease with improving reception conditions. In case of channel decoding algorithms this adaptive behavior can be achieved by syndrome based decoding methods, which allow a reduction of the receiver's energy consumption in above-average reception conditions. This paper extends the syndrome decoding approach to trellis coded modulation, as applied in the ATSC DTV system. Furthermore, the application of the syndrome concept to receivers based on Turbo equalization is considered. In this case the syndrome approach enables a reduction of the soft output decoder's complexity.