基于离散超小波变换的光码正交码

在光码分多址系统中，提高系统容量需要增大光正交码的长度，从而压缩光脉冲，而超短光脉冲的产生不易实现。针对这一问题，提出了一种研究光正交码的新方法，采用离散超小波变换对光正交码进行变换，经变换之后得到的新光正交码集仍具有良好的自相关性与互相关性。由此，对光正交码的研究与构造可转化为对新正交码的研究与构造。且采用该方法构造的光正交码在光码分多址系统中能有效地提高系统容量。

Optical orthogonal code based on discrete hyper-wavelet transform

In optical code division multiple access system, the length of optical orthogonal code (OOC) should be increased in order to improve system capacity and thus to compress optical pulses. However, the hyper wavelet pulse is not easily produced. To solve this problem, a new method for studying optical orthogonal code is established. Using the discrete hyper-wavelet transformation, the OOC can be transformed into a new code set, which also has a well property of self-dependence and interdependence. Hence, the investigation and construction of OOC is equivalent to that of the new orthogonal code set, and the OOC established by this method can effectively improve system capacity for optical code division multiple access system.