%0 Journal Article
%T Capacity Research of Asynchronous OCDMA System<br>异步OCDMA系统信道容量研究
%A Zhou Xiu-li
%A Yang Hua-jun
%A Ma Jun-xian
%A <br>周秀丽
%A 杨华军
%A 马君显
%J 电子与信息学报
%D 2007
%I 
%X To research the information capacity of the Asynchronous Optical Code Division Multiple Access(OCDMA) system,the system model and its implementation under ideal channel and AWGN channel optical communications are presented. We modeled a discrete memoryless channel OCDMA system and evaluated the aggregate capacity from the probability of the output signal at the chip level. On the condition that the information capacity limited by 1 bit per chip,the results show that the interference caused by asynchronism reduces the capacity limit as the number of users increases,but for a sufficiently large number of users,both the ideal and the AWGN channel throughput limit varies slowly and the limit is around 0.71-0.75 bit/chip. With less number of users of the ideal channel,the more the input probability is lower than 0.50,the lower the largest capacity limit will be. With low noise variance of the AWGN channel,the system with smaller users can attain higher capacity limit. So the information capacity of the asynchronous OCDMA is gotten.
%K Optical Code Division Multiple Access(OCDMA)
%K Information capacity
%K Additive White Gaussian Noise(AWGN) Channel
%K Multiple Access Interference(MAI)<br>光码分多址(OCDMA)
%K 信息容量
%K 加性高斯白噪声(AWGN)信道
%K 多用户干扰
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=3A3B6EBA50BEC1A2FFB854EB0F57F649&yid=A732AF04DDA03BB3&vid=771469D9D58C34FF&iid=708DD6B15D2464E8&sid=1C967A5CB3E65B9B&eid=A4CA59572D689648&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=10