PN Code Acquisition Using Smart Antennas and Adaptive Thresholding Trimmed-Mean CFAR Processing for CDMA Communication

Pn Code Acquisition Using Smart Antenna and Adaptive Thresholding Cfar Based on Ordered Data Variability for Cdma Communications

“…The multipath intensity profile (MIP) is assumed to be uniform (µ = 0) (except when it is indicated to have other values) as a result the Rayleigh fading channel power is set to σ f = 1/L, and the correlation length integer of the dwell time interval is set at the value of R = 128. The adaptive ODV-CFAR thresholding is also compared with other CFAR detectors such as CA-CFAR [1] and OS-CFAR [4] detectors in different situations. For the OS-CFAR processor simulations, the cell representing the threshold is selected equal to k = 0.75 N c [31] while the p lowest cells parameter in the OVD-CFAR detector is selected equal to 16.…”

“…The CMLD is robust against multipath interference as long as the number of censored cells exceeds the number of multipath interference. A generalization of the OS-CFAR and the CMLD known as the trimmed mean TM-CFAR detector has been studied in [1]. All the conventional ordered statistics detectors (OS-CFAR, CMLD and TM-CFAR) have been known to yield good performance as long as the cells containing multipath signals are properly discarded.…”

“…In [1], Sofwan and Barkat considered a novel approach using adaptive thresholding CFAR processing combined to smart antennas as a powerful method to improve the PN code acquisition performance. They used the trimmed-mean (TM) CFAR processor for adaptive thresholding [14].…”

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Abstract-Recently, a novel approach for PN code acquisition of direct sequence code division multipleaccess (DS-CDMA) systems in Rayleigh fading multipath channel was proposed in [1]. The authors considered a combination of adaptive thresholding constant false alarm rate (CFAR) and smart antennas to increase the system capacity and consequently enhance the detection performance.

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A robust auto‐adaptive approach for serial acquisition of generalized multi‐carrier spread spectrum in multipath fading mobile channels

“…For this reason, a large number of different adaptive threshold mechanisms known in the Radar systems have been applied to the code acquisition problems, where these mechanisms are based on constant false alarm rate (CFAR) algorithms that are used to determine the threshold value according to the actual environmental conditions. [7][8][9][10][11][12][13] As the arithmetic averaging CFAR detector and its modifications [8][9][10] suffer a serious detection performance degradation when the reference window used to estimate the background noise level is infected by interfering signals, 11 a variety of alternatives have been proposed to develop CFAR detectors applied to the PN code acquisition to overcome these drawbacks. These alternatives include the fixed point(s) censoring CFAR detectors, where the largest ranked cells are censored, and only the remaining ranked cells are used to estimate the background noise level.…”