Performance Analysis of Multidimensional PPM Codes for Optical CDMA Systems in the Presence of Noise
This paper analyzes the asynchronous error performance of optical code-division multiple access systems utilizing one-dimensional and multidimensional PPM codes in the presence of white Gaussian noise. The effects of the multiple access interference combined with the noise are statistically characterized by continuous probability density functions and, therefore, allowing the investigation on the error performance of the O-CDMA systems employing on-off keying (OOK) and on-off orthogonal (OOO) signaling. For OOK systems, the optimum decision threshold is determined and the error performance degradation due to deviation in the threshold is considered. Furthermore, the performances of the O-CDMA systems using OOK and OOO signaling are compared.
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