SIGNAL INTERCEPTION - PERFORMANCE ADVANTAGES OF CYCLIC-FEATURE DETECTORS

The problem of detecting the presence of spread-spectrum phase-shift-k eyed signals in variable noise and interference backgrounds is conside red, and the performances of four detectors are evaluated and compared . These include the optimum radiometer, the optimum modified radiomete r that jointly estimates the noise level and detects the signal, and t he maximum-SNR spectral-line regenerator for spectral line frequencies equal to the chip rate and the doubled carrier frequency. It is concl uded that the spectral line regenerators can outperform both types of radiometers by a wide margin. The performance advantages are quantifie d in terms of receiver operating characteristics for several noise and interference environments and receiver collection times.