Study on new scheme of byte-wise interleaving and convolutional coding for high-data-rate optical wireless communication system

Increasing interleaving depth can mitigate the impact of long deep fade induced by atmospheric turbulence.A new scheme of a FEC coding with large-depth interleaving was proposed.The transmitter was designed using an m-stage interlaced convolutional coding in combination with byte-wise interleaving;correspondingly the receiver performed word-wise deinterleaving and parallel soft-decision Viterbi decoding based on logarithmic quantization of channel input.Furthermore,a rule of byte combination was analyzed and a new configuration of co-prime byte-wise convolutional in-terleaving was presented.The results show that the new scheme reduces the complexity and the speed requirement of system design.Compared with the optimum threshold detection at a BER of 10?6,coding gains of 6.9dB were achievable by the new scheme at source data rates of 300Mbit/s.The loss with respect to perfect interleaving is only 0.3 dB.Hence,the new scheme is superior in high-data-rate optical wireless communication system.