THE DEGRADATION OF HIGHER-ORDER SPECTRAL DETECTION USING NARROW-BAND PROCESSING

In certain scenarios, higher order statistic (NOS)-based detectors exp loiting the Gaussian noise rejection property of HOS have been shown t o have performances superior to widely used second-order (SOS) techniq ues, However, a crucial limitation on these detectors that has not bee n addressed is a constraint on the processing bandwidth, We study the effects of commonly used narrowband processing on those detectors, As the processing bandwidth is decreased, we characterize the tradeoff be tween HOS and SOS detectors and demonstrate that the performance of HO S defectors degrades faster than that of SOS ones, We then consider di stributed wideband detection by a bank of local narrowband detectors w hose decisions are fused together, given a fixed-bandwidth input signa l, we show that as the number of local detectors increases, correspond ing to a decreasing amount of bandwidth for each local detector, the p erformance of such a scheme using HOS local detectors degrades more qu ickly than a scheme using SOS ones.