Research on Low Latency Decoding Scheme of Turbo Codes

To reduce the computational complexity and latency of Turbo decoding, a new decoding scheme is proposed. Firstly, the Max-Log-MAP algorithm is modified to improve performance while guarantee the calculation simplicity at the same time. Then, the parallel decoding scheme was introduced, and an improvement is made so that the two SISO decoders can work at the same time. The simulation results show that the performance of Max-Log-MAP algorithm improves 0.1~0.4 dB. Besides, the change of decoding structure doesn´t bring extra iterations, while decoding latency per iteration decreases, the whole system is surely more real-time.