ENHANCED SIGNAL INTERCEPTION IN THE PRESENCE OF INTERFERENCE

In this paper, we consider the problem of intercepting a direct sequen ce spread spectrum waveform which is embedded In both narrowband inter ference and additive white Gaussian noise. The receiver we analyze is a broadband radiometer which has been enhanced in the following manner : Prior to entering the square-law device in the radiometer, the recei ved waveform is passed through a transform domain processor which serv es as a notch filter to null out the narrowband interference before it can contribute unwanted energy to the output of the radiometer. A cen tral-limit theorem is established for the receiver's output which form s the basis for analyzing the performance of the receiver. For various combinations of system parameters, numerical results are presented in the form of receiver operating characteristics.