Amélioration De L’acquisition Adaptative Des Séquences Pn Par Les Techniques Méta-heuristiques: Étude Comparative
Résumé: The objective of the present work is to improve the adaptive acquisition of pseudo-random sequences (PN) in DS / CDMA communication systems. Fixed-threshold acquisition systems are unable to adapt to rapidly varying mobile communications environments and can lead to a high rate of false alarms and / or a low probability of detection. Therefore, we propose an adaptive arrangement of the detection threshold by using the distributed detector (CMLD-CFAR). In this study, an adaptive thresholding serial acquisition system using several local detectors and smart antennas is proposed and studied. In order to optimize thresholds of the different detectors making up this acquisition system, different meta-heuristic algorithms (PSO; GA; BBO; SFLA; TLBO) are proposed and compared. The probability of detection and the mean acquisition time of the proposed system were evaluated for the five optimization algorithms, considering two fusion rules (AND and OR). The obtained results show the superiority of the OR-TLBO optimization algorithm.
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