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从跳频光码分多址(FH-OCDMA)系统的扩频特征出发,推导出具有良好相关性能的扩频码所能达到的最大码容量,再利用二次全等理论为跳频光码分多址系统构造出一种具有最大码容量的扩频码——二次全等跳频码(QCHC),并给出了构造实例。在此基础上,运用光纤布拉格光栅序列作为编解码器设计了一种跳频光码分多址系统的实现方案,并对该系统的性能进行了详细的分析。结果表明,采用二次全等跳频码的跳频光码分多址系统具有设计简单、用户容量大和误码率低等方面的优点。
Based on the spread spectrum characteristics of frequency hopping optical code division multiple access (FH-OCDMA) system, the maximum code capacity that can be achieved by spreading codes with good correlation performance is deduced. The second order congruent theory In the CDMA system, a spreading code with maximum code capacity - quadratic equalization frequency hopping code (QCHC) is constructed and an example of its construction is given. Based on this, a scheme of FH CDMA system is designed using fiber Bragg grating as a codec, and the performance of the system is analyzed in detail. The results show that the frequency hopping optical code division multiple access system with quadratic FH code has the advantages of simple design, large user capacity and low bit error rate.