摘要
Viterbi译码算法的复杂度会随着状态数的增加而增加,因此一般适用于约束长度较小的卷积码的译码。提出了一种新的信噪比自适应Viterbi译码改进算法,在每个接收时刻通过门限值选择幸存状态,从而进一步减小译码网格中的路径搜索范围,提高译码速度。仿真表明,本算法并不会降低译码性能,而在高信噪比、大状态数的应用条件下,与传统译码速度相比,可提高译码速度最高至15倍。
The complexity of Viterbi decoding algorithm will increase with the number of the states, so it is always used in decoding convolutional codes with little states. A new signal noise ratio adaptive Viterbi decoding algorithm is proposed. As it selects the survived states through setting threshold in every step, it reduces the searching area in the trellis of decoding and improves decoding speed. The simulation results show that the BER performance will not decrease, the decoding speed is increased maximally about 15 times than common algorithm in large-state-number application.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2005年第11期1950-1952,共3页
Systems Engineering and Electronics
关键词
维特比算法
信噪比
自适应门限
Viterbi algorithm
signal noise ratio
adaptive threshold
