Code sequence analysis in asynchronous coherent time-spreading optical code-division multiple access

被引：0
|
作者：
Ji, Jianhua [1 ]
Xu, Ming [1 ]
Yang, Shuwen [1 ]
机构：
[1] Shenzhen Univ, Adv Technol Res Ctr, Shenzhen 518060, Peoples R China
来源：
JOURNAL OF OPTICAL NETWORKING | 2009年 / 8卷 / 01期
基金：
中国国家自然科学基金;
关键词：
PERFORMANCE EVALUATION; OCDMA SYSTEM; BEAT NOISE; COMMUNICATION; CDMA;
D O I：
10.1364/JON.8.000026
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
An analysis of the code parameters that are important to asynchronous coherent time-spreading optical code-division multiple-access (OCDMA) systems employing Gold codes is presented. Multiple-access interference (MAI) and beat noise (BN) are analyzed according to the aperiodic cross-correlation function. The relationship between the mean intensity of aperiodic cross-correlation and MAI and BN is deduced. Considering the mean system performance, MAI and BN can be calculated directly from the aperiodic autocorrelation function, and the aperiodic cross-correlation function is not needed. Hence, a computational saving can be achieved. Considering the worst system performance, the upper bound of the bit-error-rate performance is evaluated by the maximum value of the mean intensity of aperiodic cross correlation. For a 511 length Gold sequence, a coherent time-spreading OCDMA system can support 12 interfering users for the mean performance. However, an OCDMA system can support fewer than five interfering users in the worst performance. (C) 2008 Optical Society of America
引用
收藏
页码：26 / 32
页数：7
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