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In this paper, a new family of two-dimensional (2-D) optical codes with the maximum cross-correlation value of two is constructed and analyzed for optical code-division multiple access. Our 2-D codes employ wavelength hopping, controlled by the permutations of ??synchronized?? prime sequences, onto the pulses of a time-spreading optical orthogonal code (OOC). The new construction supports larger code...
A neural based controller with adaptive algorithm is presented in this paper to cancel the nonlinear broadband noise of an active noise control (ANC) system. The ways to avoid the premature saturation of backpropagation algorithm and design the optimal learning rate are also included in the paper to improve the noise reduction performance. The proposed neural filter can be easily implemented and also...
In this paper, a new family of wavelength-time codes, called multiple-wavelength optical orthogonal codes (MWOOCs), is constructed. The new codes use prime sequences for wavelength permutations on top of a time-spreading OOC. The advantage is that the code cardinality is a quadratic function of the number of wavelengths. This property is particularly useful in high bit-rate optical CDMA applications,...
In this paper, a new class of carrier-hopping codes for frequency-hopping wireless and wavelength-hopping fiber optic code-division multiple-access (CDMA) is constructed by modifying the original carrier-hopping prime codes. The new carrier-hopping prime codes possess expanded and asymptotically optimal cardinality, zero autocorrelation side-lobes, and cross-correlation functions. The performance...
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