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随着相位编解码器关键技术的突破,精确分析相位编码光码分多址(OCDMA)系统误码率性能显得十分必要。为了精确分析相位编码光码分多址系统误码率性能,提出了一种基于判决变量的矩母函数和鞍点近似的非高斯近似方法,该方法能够精确考虑多址干扰、散粒噪声、热噪声各自的统计特性和相互间的非加性关系。比较了高斯近似、精确计算和文中所提出方法在分析相位编码系统误码率时的计算精度和复杂度,结果证明该分析方法具有分析精度高、计算复杂度低的优点。
With the breakthrough of the key technologies of phase codec, it is very necessary to accurately analyze the bit error rate performance of OCDMA system. In order to analyze the bit error rate performance of phase code optical code division multiple access (CDMA) system accurately, a new method called moment matrix function based on decision variables and non-Gaussian approximation of saddle point approximation is proposed. The method can accurately consider multiple access interference, shot noise, The statistical characteristics of noise and the non-additive relationship between each other. The accuracy and complexity of Gaussian approximation, exact calculation and the proposed method are analyzed when analyzing the bit error rate of phase encoding system. The results show that the proposed method has the advantages of high precision and low computational complexity.