直接序列CDMA在光传输中的非线性效应

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI:10.1109/ISSSTA.1994.379517

W. Huang, M. Nakagawa

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引用次数: 28

摘要

分析了异步直接顺序码分多址(DS/CDMA)系统光传输中由于激光二极管(LD)非线性引起的互调失真(IMD)。用无存储器的三阶多项式表示LD非线性。在DS/CDMA系统中，三阶互调项只有一个谐波落在信号频带上，影响系统性能。利用自相关函数的信息推导出平均失真。研究结果对CDMA系统设计和性能分析具有一定的参考价值。对于LD非线性，有必要选择一个最优的调制指数，以提供最大的载波噪声比(CIN)。并比较了LD非线性对CDMA和频分多址的影响。该分析方法也适用于CDMA系统中的其他一般非线性问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nonlinear effect of direct-sequence CDMA in optical transmission

The intermodulation distortion (IMD) due to laser diode (LD) nonlinearity of an asynchronous direct-sequence code division multiple access (DS/CDMA) system in optical transmission is analyzed. A third-order polynomial without memory is used to present LD nonlinearity. In DS/CDMA systems, only one harmonic of the third-order intermodulation term falls on the signal frequency band and influences the system performance. The average distortion is derived with only the information of auto-correlation functions. The results are useful for CDMA system design and performance analysis. With LD nonlinearity it is necessary to select an optimal modulation index that provides a maximum carrier-to-noise ratio (CIN). The effect of the LD nonlinearity on CDMA and frequency-division multiple access (FDMA) is also compared. The analytical method is applicable to other general nonlinearities in CDMA systems.<>

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Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)

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