DocumentCode :
905014
Title :
A note on power-law devices and their effect on signal-to-noise ratio
Author :
Berglund, C.N.
Volume :
10
Issue :
1
fYear :
1964
fDate :
1/1/1964 12:00:00 AM
Firstpage :
52
Lastpage :
57
Abstract :
The effect of power-law devices, used as either band-pass nonlinear amplifiers or envelope detectors, on the signal-to-noise ratio is determined for both limiting cases of very large and very small input signal-to-noise ratio. Expressions are derived for the degradation in signal-to-noise ratio in terms of the envelopes and phases of the signal and noise. The results are general, applying to Gaussian and non-Gaussian noises and modulated and unmodulated signals, and allow important conclusions to be reached concerning the value of power-law devices in communications systems in various signal and noise environments. It is found that band-pass nonlinear amplifiers can generally be chosen to improve the signal-to-noise ratio if the input signal-to-noise ratio is small and the noise is non-Gaussian. Envelope detectors usually degrade the signal-to-noise ratio since they exhibit a "small-signal suppression" effect in all noise environments except for the special case of unmodulated sine-wave interference.
Keywords :
Nonlinearities; Signal detection; Books; Degradation; Envelope detectors; Gaussian noise; Information theory; Phase noise; Power amplifiers; Signal analysis; Signal to noise ratio; Working environment noise;
fLanguage :
English
Journal_Title :
Information Theory, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9448
Type :
jour
DOI :
10.1109/TIT.1964.1053643
Filename :
1053643
Link To Document :
بازگشت