A study on code construction of optical orthogonal codes with variable chip rates
A study on code construction of optical orthogonal codes with variable chip rates
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发表时间：
2012-10
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通讯作者：
T. Tsujioka
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作者：
T. Tsujioka
为了实现光CDMA网络的灵活复用，光正交码（OOCs）技术受到了许多研究者的研究。本文提出了可变片率码（VC-OOC），在普通光CDMA网络中，即使使用不同片率码，也能保持严格片率码的正交特性。本文提出了一种码结构方案，对芯片速率较慢的码字采用平衡不完全块设计（BIBD）序列，对芯片速率较快的码字采用平衡不完全块设计（BIBD）序列来扩大脉冲间隔分布的自由空间。通过简单的代码搜索，可以设计出更快的芯片速率代码。
For flexible multiplexing in optical CDMA networks, optical orthogonal codes (OOCs) have been studied by many researchers. The authors have proposed OOCs with variable chip rates (VC-OOC), in which the orthogonal property of the strict OOC can be kept even when different chip rate codes are used in a common optical CDMA network. In this paper, a code construction scheme is proposed, where the balanced incomplete block design (BIBD) sequences are employed for the slower chip rate codewords, and select them to enlarge free space in distribution of pulse intervals for the faster chip rate codewords. The faster chip rate code can be designed by simple code search.