Abstract: In this paper，a new bit-by-bit decoding method is presented for reducing Turbo code’s decoding iterations，decoding delay and power consumption by simulation analysis of Turbo code’s decoding for image transmission.The method not only provides different decoding iterations according to different bits，but also optimizes the iterations of each bit.Compared with other general methods，simulation result shows that the proposed approach has a 50% reduction in the total number of iterative decoding，and ensures the image effects after decoding.

摘要： Turbo码的迭代译码次数越多，译码延时和功耗也越大，通过图像传输的Turbo译码仿真分析，提出按不同比特位迭代次数不同的译码方法，并对各比特位的迭代次数进行优化，结果能使总迭代译码次数减少50%，且能保证译码后的图像效果。