Performance Analysis of an Adaptive Threshold Hybrid Double-Dwell System With Antenna Diversity for Acquisition in DS-CDMA Systems
In this paper, the authors consider the analysis of the acquisition process for a hybrid double-dwell system with antenna diversity for DS-CDMA (Direct Sequence-Code Division Multiple Access) using an adaptive threshold. Acquisition systems with a fixed threshold value are unable to adapt to fast varying mobile communications environments and may result in a high false alarm rate, and/or low detection probability. Therefore, they propose an adaptively varying threshold scheme through the use of a Cell-Averaging Constant False Alarm Rate (CA-CFAR) algorithm, which is well known in the field of radar detection. They derive exact expressions for the probabilities of detection and false alarm in Rayleigh fading channels. The mean acquisition time of the system under consideration is also derived.