基于LTE截尾卷积码的译码算法改进研究

Improvement of LTE tail-biting convolutional code-based decoding algorithm

文章基于LTE(长期演进)采用的截尾卷积码,介绍了截尾卷积码的循环维特比译码算法(CVA)和环绕维特比算法(WAVA),并综合两种算法的优点,对现有算法做了改进,减小了译码计算的复杂度。仿真结果表明,同WAVA相比,改进算法可获得较好的效果,且计算量减小了1/4。

On the basis of the Long Term Evolution（LTE） tail-biting convolutional code,this paper introduces the Circular Viterbi Algorithm（CVA） and the Wrap-Around Viterbi Algorithm（WAVA） for this code.Combining their advantages,it makes improvement on the existing algorithms and reduces the decoding computational complexity.The simulation results show that compared with WAVA,the improved algorithm has better performances and reduces the computational amount by 1/4.