Optical OOK-CDMA and PPM-CDMA systems with turbo product codes
Optical OOK-CDMA and PPM-CDMA systems with turbo product codes
复制标题
具有 Turbo 产品代码的光学 OOK-CDMA 和 PPM-CDMA 系统
DOI：
10.1109/jlt.2002.802224
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发表时间：
2002
影响因子：
4.7
通讯作者：
S. McLaughlin
中科院分区：
文献类型：
--
作者：
C. Argon;S. McLaughlin
提出了turbo积码（TPC）在具有开关键控或二进制脉冲位置调制的强度调制直接检测光码分多址（CDMA）系统中的应用。在光CDMA系统中，其他用户产生的光多址干扰是影响系统性能和限制活跃用户总数的主要噪声源。本文根据二进制无记忆信道模型，对原有的turbo积译码算法进行了改进。结果表明，在光CDMA系统中实现tpc可以显著提高误码率，从而允许使用更小权重的光正交码（OOC）拥有更多的活跃用户。提议的TPC有大约20%的开销，但是OOC重量的减少使系统带宽减少到不到类似的未编码系统的一半。
The application of turbo product codes (TPC) in intensity-modulated direct-detection optical code-division multiple-access (CDMA) systems with ON-OFF keying or binary pulse-position modulation is proposed in this study. Optical multiple-access interference caused by other users is the main source of noise that degrades system performance and limits the total number of active users in an optical CDMA system. In this work, the original turbo product decoding algorithm is modified according to the binary memoryless channel model. It is shown that the implementation of TPCs in an optical CDMA system provides significant improvement of the bit-error rate, hence, permitting a higher number of active users with optical orthogonal codes (OOC) of less weight. The proposed TPC has about 20% overhead, but the reduction in the weight of the OOC reduces the system bandwidth to less than half to that of the comparable uncoded system.