TO CD [ > Q Detection Capabilities of Several Phase - Processing Receivers

The operating characteristics of several phas* -processing receivers for detection of a sine wave in Gaussian noise are deduced both analytically and by simulatirn and compared with optimum processors over a wide range of signal-to-noise ratios. Among the processors considered are (1) the optimum phaseprocessor for small signal-to-noise ratio and known sine wave frequency, (2) the maximum likelihocd phase-processor for small signal-to-noise ratio and unknown sine wave frequency, (3) the phase-difference processors for known or unknown sine wave frequency, and (4) a phase processor the* measures the scatter of phase samples about the best-fitting straight line. It is found Üiat using phase samples alone is much better than using amplitude samples alone, and ;s not much l(;ss effective than using amplitude and phase samples together when the number of samples is large and the signal-to-noise ratio of each sample is small; loss of amplitude information causes about 1 dB degradation ui many important situations.