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为了在成像光通信中充分利用时间和空间两种频带资源,以成像光通信为基础,提出一种利用二维光正交Pattern码结合时域扩频实现光码分多址(OCDMA)编码的新方案。分析在该方案中存在的多址干扰噪声,并给出了噪声的概率密度函数,然后讨论由多址噪声引起的误码率与判决门限、用户数、码长积和码重积之间的关系。在相同的码容量下与时域扩频光码分多址编码和空间扩频光码分多址编码方案相比,该方案能降低对相关器件性能(时域码片数量和空间像素规模)的要求,而且还可获得更小的误码率。最后给出编码解码的光学实现方案。
In order to make full use of time and space resources in imaging optical communication, an optical orthogonal code (OCDMA) coding based on imaging optical communication is proposed. new plan. The multiple access interference noise existing in the scheme is analyzed and the probability density function of the noise is given. Then the relationship between bit error rate caused by multiple access noise and decision threshold, number of users, relationship. Compared with time-domain spread-spectrum optical code-division multiple access coding and space-spread optical code-division multiple access coding in the same code capacity, this scheme can reduce the performance of related devices (number of time-domain chips and spatial pixel size) The request, but also can obtain smaller error rate. Finally, the optical decoding scheme is given.