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在分析光码分多址 ( OCDMA)系统的多址复用光纤传输信道模型的同时 ,从最大似然检测的角度出发 ,推导了基于该模型的 OCDMA最佳多用户检测器 ,该检测器可通过维特比( Viterbi)算法实现 .在此基础之上 ,利用相关检测的原理 ,研究了一种较实用的次佳多用户检测器——多级检测器 ,在抑制多址干扰的同时 ,尽量降低检测器实现的复杂度 ,并分析了它对系统性能的影响 .结果表明 :由于传输环境的不同 ,OCDMA系统具有与无线 CDMA系统不同的最佳多用户检测判决准则 ;而作为一种非线性多用户检测技术 ,多级检测器可以较理想地改善 OCDMA系统的误码率性能
In the meantime, the OCDMA best multi-user detector based on this model is derived from the point of view of maximum likelihood detection while analyzing the OMA channel model of optical multiple access (OCDMA) system. Based on the principle of correlation detection, a more practical sub-optimal multi-user detector, multi-level detector, is proposed to suppress multiple access interference Reduce the complexity of the detector implementation and analyze its impact on system performance.The results show that due to the different transmission environment, OCDMA system has the best multi-user detection decision criteria different from the wireless CDMA system; as a nonlinear Multi-user detection technology, multi-level detector can better improve the BER performance of OCDMA system