A new method of iterative differential demodulation and decoding for SCCC-coded systems

Researches on the application of iterative differential demodulation and decoding in SCCC-coded systems are presented. Knowing that the tradition algorithm of iterative decoding in SCCC-coded systems has a high complexity with a two-level iteration structure, a low complexity approach is proposed. In each iteration of the channel decoding, the demodulator uses the extrinsic information of the outer decoder of the channel decoder as a priori information to make a soft decision to update the codewords. As a result, the `turbo processing´ of both the entirety iteration and the inner iteration of channel decoder is simplified to a single-level iterative system. It is shown that iterative demodulation and decoding can effectively improve the performance of the systems. The optimized single-level method almost keeps the similar performance and reduces the complexity significantly.