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以光正交码(OOC)作为时间扩频序列,以单重合序列(OCS)作为波长跳频序列,构造了一种新的二维光正交码,即光正交码/单重合序列。与其他二维光正交码相比,光正交码/单重合序列的波长数并不局限于素数或素数幂,可以是任意整数,不仅构造灵活,而且可充分利用多波长光码分多址(MW OCDMA)系统的有效波长数。分析了光正交码/单重合序列码字的自相关和互相关性能,并得到了其互相关均值的具体表达式。最后,针对多波长光码分多址不同的系统参数,对不同参数的光正交码/单重合序列码字性能进行了分析和讨论:1)给定单重合序列参数和光正交码的码重,增加码长将降低光码分多址系统误码率;2)给定光正交码的参数和单重合序列的码长,增加波长数将降低光码分多址系统误码率。
A new two-dimensional optical orthogonal code, Orthogonal Code (OOC) as a time spreading sequence and single coincidence sequence (OCS) as a wavelength hopping sequence, is constructed. Compared with other two-dimensional optical orthogonal codes, the number of wavelengths of the optical orthogonal codes / single coincidence sequences is not limited to prime numbers or prime powers, and can be any integer, which not only has the advantages of flexible construction but also can fully utilize multi-wavelength optical code division multiple The effective wavelength of the system (MW OCDMA) system. The autocorrelation and cross-correlation performance of the Orthogonal Code / Single-Concatenated Codeword are analyzed, and the concrete expressions of the mean value of the cross-correlation are obtained. Finally, according to the different system parameters of multi-wavelength optical code division multiple access, the performance of optical orthogonal code / single coincidence sequence code with different parameters is analyzed and discussed: 1) The code weight of given single coincidence sequence parameter and optical orthogonal code , Increasing the code length will reduce the bit error rate of the optical code division multiple access system; 2) given the parameters of the optical orthogonal code and the code length of the single overlap sequence, increasing the number of wavelengths will reduce the bit error rate of the optical code division multiple access system.