We present in this chapter, the performance study of a direct sequence-optical code-division multiple access (O-CDMA) link. In such systems, the main limitation is the multiple access interference (MAI). We investigate various schemes of receiver in the aim of improving the performances and mitigating MAI. Furthermore, we show the benefits of different techniques in regard to conventional ones. However, this system uses ultrashort light pulses that are sensible to the optical link parameters, especially the fiber chromatic dispersion. We have shown that when compensation dispersion devices are not deployed in the system, there is a trade-off between the limited dispersion effects and the MAI.
Spectrum sensing techniques have many challenges and as one as the most challenges are the noise and interference rejection. Since the occurrence of noise power uncertainty cause the degradation of the performance of the spectrum detector. One of the most techniques of spectrum sensing is the Energy Level detection it could be used with deep learning network to distinguish between presence of signal and noise to this end, we will introduce a comparison between AlexNet, SqueezeNet ResNet101 and LSTM neural networks. To test them in different situations. . ...
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