光码分多址并行图像传输系统的最佳光正交签名图形构造

图像传输和接入要求系统的吞吐量超过Gb/s,若采用常规光码分多址系统来实现图像传输,对光电器件的要求高、实现难度大,解决方案是采用光码分多址并行图像传输系统.针对并行图像传输的签名序列是一种二维光正交签名图形,是一种全新形式的签名码,构造最大容量的光正交签名图形(最佳光正交签名图形)的方法很少这一问题,提出一种区组设计构造算法.算法的思想是根据差集合和光正交码的关系,将差集合和区组设计的概念推广到二维空间,根据二维差集合和光正交签名图形的关系从而构造出最佳光正交签名图形.详细阐述了构造最佳光正交签名图形的步骤,对算法进行了仿真.仿真结果说明该算法可以有效地构造出最佳光正交签名图形.

Construction of Optimal Optical Orthogonal Signature Patterns Based on Optical Code Division Multiple Access for Image Transmission

It is stated that image transmission and access need the throughout of the system exceeding well over Gb/s,if conventional optical code division multiple access system is used as transmission system,it will be very difficult to realize because of the speed limitation of current opto-electronic devices,and the requirement to opto-electronic devices will be very high.The solution is adopted parallel transmission system based on optical code division multiple access.However,the signature of the parallel transmission system is a two-dimensional optical orthogonal signature patterns different from conventional signature sequences.Aiming at the problem that the construction of the maximum capacity of the optical orthogonal signature patterns (optimal optical orthogonal signature patterns) is lacked now,a novel construction algorithm based on block design is presented.The idea of the algorithm is based on the relationship between difference sets and optical orthogonal codes.If the concept of difference sets and block design can be extended to two-dimensional space,then according to the relationship between two-dimensional difference sets and optical orthogonal signature patterns,the construction of optimal optical orthogonal signature patterns can be achieved.The procedures to construct optimal optical orthogonal signature patterns are explained in detail.Simulation based on the algorithm is done.The simulating result shows that this algorithm can construct optimal optical orthogonal signature patterns effectively.