摘要
卷积码可以用维特比算法作为译码算法,由于维特比译码器复杂度随着反馈深度的增长成指数倍增长,因而译码反馈深度对译码器的复杂度影响很大甚至可能无法实用,目前有些文献中仅给出了反馈深度的大致范围,但在硬件实现和性能仿真时无法确定一个具体的数值。通过在OFDM系统中运用卷积编码和维特比译码仿真分析发现,维特比译码器反馈深度为卷积码编码器存贮长度的5倍时,既可达到性能和硬件复杂度的良好折衷,又便于实际应用。
This paper proposes how to choose optimal traceback depth of Viterbi decoder in OFDM systems. The decoder is largely affected by the decoder traceback depth, because the decoder complexity increases exponentially with the decoder traceback depth. There are lots of references which are analyzed theoretically the performance caused by traceback depth, but the range is so wide that it is difficult to choose precise value. According to ＇apply convolutioanl encoding and viterbi decoding in OFDM system, we find that the optimal decoding traceback depth is 5 times of constrained length of encoder on the basis of considering a trade - off between performance and equipment complexity,this conclusion can be applied in other communication systems.
出处
《现代电子技术》
2006年第3期45-46,50,共3页
Modern Electronics Technique
基金
重庆邮电学院博士基金(A200366)
作者简介
张俊 男，1994年7月毕业于宁夏大学数学系，学士学位。1994年至今历任银南地区邮电局机务员、吴忠电信局计算中心主任、吴忠市电信分公司市场经营部副主任、吴忠市电信分公司市场经营部主任。
