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阐述了自相关旁瓣为0,互相关值小于等于1的二维光正交码(2D-OOC)的新构造方法及非同步频域跳频时域扩频二维光码分多址(2D-OCDMA)系统中的干扰估计接收机模型。二维光正交码的新构造方法以两个单极性码分别作为频域跳频模式和时域扩频模式。用作频域跳频模式的地址码是自相关旁瓣及互相关值小于等于1的一维光正交码(1D-OOC),用作时域扩频模式的地址码其码长为素数或码长与码中任意两个非零码元的位置差值互质。将一个没有分配给任何用户并且和接收用户地址码正交的地址码用作干扰估计码来得到多用户干扰(MUI)估计值,从而得到最佳的判决门限。系统误码率(BER)的分析显示干扰估计接收机系统的性能要优于传统的接收机系统。
The new construction method of two-dimensional optical orthogonal code (2D-OOC) with autocorrelation sidelobe as 0 and cross-correlation value less than or equal to 1, as well as the new construction method of unsynchronized frequency-domain frequency-hopping spread-spectrum two-dimensional optical code division multiple access 2D-OCDMA) interference estimation receiver model. A new method of constructing two-dimensional optical orthogonal codes uses two unipolar codes as frequency-domain frequency-hopping patterns and time-domain spreading patterns, respectively. The address code used as the frequency-domain frequency hopping mode is a one-dimensional optical orthogonal code (1D-OOC) with self-correlation side lobe and cross-correlation value less than or equal to 1. The address code used as the time-domain spreading mode has a code length of prime Or the difference between the code length and the position difference between any two non-zero symbols in the code. An address code that is not assigned to any user and that is orthogonal to the receiving user’s address code is used as the interference estimation code to obtain a multi-user interference (MUI) estimate, resulting in the best decision threshold. Analysis of the system’s bit error rate (BER) shows that the interference estimation receiver system performs better than the conventional receiver system.