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对光码分多址(OCDMA)系统的误码性能进行了研究。在对OCDMA采用的光接收机及噪声讨论的基础上,综合考虑用户间的多址干扰和光接收机噪声,首次推导了计算系统误码率上限的公式,并给出了相应的曲线,得出了对实际系统设计具有指导意义的结果。分析表明:多用户光纤CDMA系统是一个具有弹性容量的系统;当用户较少时系统误码性能主要受其接收机噪声的影响,用户较多时则主要由用户间的多址干扰决定。
The error performance of Optical Code Division Multiple Access (OCDMA) system is studied. Based on the discussion about the optical receiver and noise adopted by OCDMA, the formula of computing the upper bound of the bit error rate of the system is derived for the first time considering the multiple access interference between users and the noise of the optical receiver. The corresponding curves are obtained. The actual system design has the guiding significance of the results. The analysis shows that the multi-user optical fiber CDMA system is a flexible capacity system. When the number of users is small, the error performance of the system is mainly affected by the noise of the receiver. When the number of users is large, it is mainly determined by the multiple access interference among users.