Abstract:

Based on the decomposed model of Continuous Phase Modulation (CPM), CMP is divided into a Continuous Phase Encoder (CPE) and a Memoryless Modulator (MM). Using the memorial and recursive characters of CPE, combining with external turbo code and random interleaver, the model of turboCMP system is established. Making use of the soft information output character of the system's demodulator and decoder, an iterative detection receiver based on the SISO algorithm is proposed. The effects of the parameters of the turboCMP system on its performance are studied. Theoretical analysis and simulation results show that the proposed receiver can improve the convergence of iteration, and reduce the errorfloor and the biterrorrate effectively than that of traditional concatenated receiver under the condition of low signaltonoise ratio.

Key words: communication technology, Turbo code, continuous phase modulation, iterative algorithm, receiver