To solve the problem of poor validity for pulse position modulation(PPM) combined with ordinary error correction coding,after PPM symbol structure and atmospheric optical wireless communication channel characteristics are investigated,the Turbo product coded(TPC)-PPM mechanism is proposed in this paper which has good anti-fading ability and power efficiency.The bit interleaving of TPC-PPM to break up burst errors is studied,and the soft demodulation confidence measurement algorithm of PPM for so...