关键词: 长期演进, 前向纠错, 咬尾卷积码, Viterbi译码

Abstract:

Long term evolution（LTE）system used the tailbiting convolutional codes and the turbo codes to achieve forward error correction（FEC）. Viterbi decoding is an outstanding convolutional code decoding algorithm, it is a maximum likelihood decoding method. Based on LTE tailbiting convolutional codes, this paper analysised several existing viterbi decoding algorithms, and proposed an improved algorithm to reduce the decoding computational complexity. The simulation results show that the improved decoding algorithm not only reduces the computational complexity of decoding,but also reduces the bit error rate, so it is very suitable for the decoding requirements of LTE system.

Key words: LTE, FEC, tailbiting convolutional code, viterbi decoding algorithm