A Novel Hardware Implementation Mechanism for AR4JA Codes in Deep Space Communication

Because of its parity check matrix has good systematicness, the minimum distance between codes has linear relationship with code length, AR4JA (accumulate-repeat-4-jagged-accumulate) codes is thought to be one of the most suitable error control channel codes for deep space reliable communication in the future. In order to reduce the modified min-sum algorithm decoder hardware implementation complexity of AR4JA codes, a method of constraint about clipping threshold is proposed in the paper, based on the analysis of the effects of modify factor, clipping threshold and input quantization on the performance. The simulation results show that when the modify factor A is 0.75, received signal clipping threshold cth is 4, and use 8Q5 quantization, the decoding performance of the modified min-sum algorithm for AR4JA codes is close to the theoretical value. Meanwhile, in this condition it can reduce the hardware implementation complexity for just need addition, comparison and shift operation, which is beneficial to realize miniaturization of deep space communication receiver.