多维地址码对OCDMA系统性能的影响

Influence of Multiple Dimensional Address Code on Performance of OCDMA Systems

讨论了一维/二维二次素数码、光正交码的构造过程、相关性、容量等特性,分析了它们对光码分多址(OCDMA)系统误码性能和用户容量的影响。为得到不同码字与不同维数码字对OCDMA系统的误码率影响程度,仿真比较了一维、二维二次素数码和一维、二维光正交码之间的误码率与同步用户数的关系以及二维素数码与二维光正交码的误码率与同步用户之间的关系。结果表明:二维误码性能高出一维码误码性能几个数量级;二维素数码在并发用户数较少时,优于二维光正交码,并发用户较多时,其误码率相当。研究结果对实际系统中不同条件下选择码字提供了参考。

The construction, correlation, capacity and other features of one and two-dimensional Synchronous Square Prime Codes（SSPCs） and Optical Orthogonal Codes（OOCs） are discussed, their impacts on BER（ Bit Error Rate） performance and user capaciVy of OCDMA（Optical Code Division Multiple Access） systems am analysed. In order to get the degree of influence of different patterns and different dimensions codes on BER of OCD- MA systems, relationship between BER and number of simultaneous users of 1D-SSPC and 2D-SSPC, 1D-OOC and 2D-OOC, 2D-SSPC and 2D-OOC are compared by simulation. Results show that BER performance of two- dimensional codes is several orders of magnitude higher than that of one-dimensional, and 2D-SSPC is better than 2D-OOC with few simultaneous users while both are fairly with many simultaneous users. The results provide references for actual system to select codeword under different conditions.