%0 Journal Article
%T Bit Soft-Output Algorithm for Dual N-ary Orthogonal Spread Spectrum System
双多进制正交扩频系统的比特软值输出算法
%A Zhang Yu-ming
%A Cheng Yun-peng
%A Wei Sheng-qun
%A Shen Liang
%A
张玉明
%A 程云鹏
%A 魏胜群
%A 沈良
%J 电子与信息学报
%D 2006
%I
%X Focusing on Turbo-coded dual N-ary orthogonal spread spectrum system, this paper proposes an algorithm for computing bit soft metric based on Maximum a Posteriori Probability (MAP) criterion, and then presents a simplified MAP algorithm. Meanwhile, the fixed-point and float-point performances are simulated and compared with several existing algorithms. It is shown that MAP algorithm greatly improves the whole system performance; the simplified MAP algorithm with L = 3 outperforms the dual-maxima algorithms 0.4dB without extra cost in complexity..
%K Turbo code
%K Orthogonal code
%K MAP algorithm
Turbo码
%K 正交码
%K 最大后验概率算法
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=2C78E640C2D3EF40&yid=37904DC365DD7266&vid=D3E34374A0D77D7F&iid=38B194292C032A66&sid=366B1248A15658C5&eid=E0172F1A638CE984&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=11