一种新的双极性完全互补光码分多址系统设计及性能分析

Design of a New OCDMA System Based on Bipolar Complete Complement Codes and Analysis for the Performance of the System

基带双极性光码分多址(OCDMA)系统,采用码的极性转换思想,实现在单极性信道中传输双极性码.提出了一种采用双极性完全互补码的非相干OCDMA系统模型及编解码方案,研究了完全互补码在系统中的应用以及对OCDMA系统性能的影响.分析比较了基于双极性完全互补码的OCDMA系统相对于基于m序列的OCDMA系统的性能优势.结果表明,完全互补码具有理想的自相关和互相关特性,适合应用于双极性光码分多址通信系统,可以有效降低OCDMA系统中的多址干扰(MAI),提高通信质量.

The base-band bipolar optical code division multiple access （OCDMA） system is introduced, with transform of unipolar-bipolar and bipolar-unipolar, transmission of signal with bipolar codes is realized through unipolar medium. An OCDMA system model and coding-decoding project based on bipolar complete complement codes are proposed. The application and performance of the complete complement codes in this system are analyzed. The advantages of OCDMA system based on complete complement codes relative to OCDMA system based on m sequences are also analyzed. As a result, complete complement codes are fit for using in bipolar OCDMA system due to their ideal auto-correlation and cross-correlation properties. The MAI in OCDMA system can be reduced effectively and the communication quality can be improved.