Particle Swarm Optimization Aided Serial Acquisition in Distributed OSCFAR and CMLD for DS-CDMA Systems in Fading Channels

In this paper, adaptive serial acquisition schemes are proposed using threshold optimization in Multisensor data fusion for mobile communication systems in frequency selective Rayleigh fading channel. Two distributed adaptive detectors based on ordered statistics constant false alarm rate (OSCFAR) and censored mean level detector (CMLD) are used. For threshold optimization, the Particle Swarm Optimization (PSO) with linearly decreasing strategy is suggested, employing two logical fusion rules to enhance the serial-search in a multipath environment. The acquisition and detection performances are investigated under different system parameters and channel condition, namely the number of distributed sensors, the partial correlation length, the number of resolvable path and the effect of fading. Simulation results shown the robustness of the proposed distributed adaptive acquisition CMLD processor using PSO over the one based on OSCFAR. Moreover, the benefit of proposed schemes over adaptive acquisition ones using one antenna is also investigated by simulation.