Abstract: In order to decrease the positive feedback of the Serially Concatenated Continuous Phase Modulation (SCCPM), a new stopping algorithm for iterative decoding based on the average extrinsic information exchange is proposed. The algorithm uses the method for average extrinsic information exchange, which makes the mean of extrinsic information of all previous iterations a priori information for the next iteration, and then it performs decoding with two stopping criterions of dynamic iterative decoding: Sign Change Ratio (SCR) and Hard Decision-Aided (HDA). Simulation result shows that the proposed algorithm with dynamic iterative stopping criteria can resist the positive feedback and improve BER performance as well as reduce the iterative decoding delay.

Key words: continuous phase modulation, SCCPM, extrinsic information exchange, iterative decoding, stopping algorithm