A simple but rigorous analysis of the important sources of noise in homodyne detection is presented. Output noise and signal-to-noise ratios are compared for direct detection, conventional (one-port) homodyning, and two-port homodyning, in which one monitors both output ports of a 50-50 beam splitter. It is shown that two-port homodyning is insensitive to local-oscillator quadrature-phase noise...

Stochastic resonance (SR) is a phenomenon whereby the detection of a low-level signal is enhanced in a nonlinear system by the introduction of noise. Studies of the effects of SR in neurons have suggested that noise could play a prominent role in improving detection of small signals. Most experimental SR research has focused on the role of noise in sensory neurons using physiological stimuli. C...

In this study, digital communication based on antipodal signal transmission is analyzed under skewed alpha-stable noise whose parameters are assumed to be unknown. The receiver modelled by suboptimal detectors such as soft limiter and sign correlator which determine the transmitted binary information directly from received noisy signals. Degradation effect of skewness impulsive bit error rate i...