A Flexible FPGA Based QC-LDPC Decoder for the Adaptive Coding and Modulation Scheme of Broadband Satellite Communication System

We designed a FPGA based LDPC Decoder for decoding Type-I QC-LDPC codes with flexible code rate and code length, by which the channel adaptation could be realized with very fine granularity. In addition, the decoder shows good bit error rate (BER) performance whose performance loss is only O.6dB at the BER of 10⁻⁶, compared with the theoretical performance when decoding the same LDPC codes using normalized Min-Sum based layered decoding algorithm.