Patent ID: 6356600
Filing Date: 2002-03-12
Classification: G01S,H04L

Abstract:
A system for detecting unknown broadband signals in a received data stream comprising:a preprocessor operating the received data stream to generate a training vector xT corresponding to a noise only portion of the received data stream and a detection vector xD corresponding to noise plus signal interval of the received data stream; a spectrum processor coupled to receive said training and detection vectors from said preprocessor, said spectrum processor generating cleaned broadband spectrum estimates {tilde over (C)}1(Æ’) and {tilde over (C)}2(Æ’) of said training and detection vectors; and a detection processor coupled to receive said cleaned broadband spectrum estimates {tilde over (C)}1(Æ’) and {tilde over (C)}2(Æ’), said detection processor using the spectrum estimates as input to a non-parametric power law detection process given by: &Sum;n&it;(C~2&af;(fn)C~1&af;(fn))v&it;signal&it;â€ƒ&it;present>&leq;signal&it;â€ƒ&it;absent&it;Î»wherein {tilde over (C)}1(Æ’n) is a broadband spectrum estimate of the training vector xT for the nth subband, {tilde over (C)}2(Æ’n) is a broadband spectrum estimate of the detection vector xD for the nth subband, and &ngr; is a positive real number to provide an output indicating a number and location of subbands occupied by a detected signal.