Simulation and implementation of MSK BPTC code in DSP chips

This study discussed the decoding mechanism of block product turbo code (BPTC) (196,96) and simulated its efficiency, used the Hamming (15,11) and Hamming (13,9) block channel code combinations and block interleaving to construct a MSK modulation and BPTC (196,96) coding system in the concept of feedback encoding in turbo code. The decoding mechanism was meticulously described to explain the advantage of this turbo feedback structure. This study also analyzed and simulated special combination of MSK modulation with BPTC channel code. The simulation results indicate MSK BPTC is less robust than MSK Golay (20, 8) of t = 4 for 1.2dB against noise, but having better performance when the signal Eb/N0 exceeding the cross over point and approaching 0.2dB gain relative to MSK Golay (20, 8) of t = 4. Whenever the C code system program is constructed, the system program should be optimized and realized on the DSP platform. Both MSK BPTC and BPSK BPTC C program optimization efficiency statistics are analyzed. The implementation can be applied to the wireless communication system of Software Defined Radio (SDR) concept, so that different modulation and encoding modes can adjust parameters in firmware directly according to different system specification requirements.