Signal-Noise Ratio of Nonlinearity Followed by Coherent Detector and Envelope Detector

Iwao SASASE  Shinsaku MORI  

IEICE TRANSACTIONS (1976-1990)   Vol.E71   No.2   pp.139-146
Publication Date: 1988/02/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Foundations of Signal Theory and Communication Theory

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A general analysis of the combined effects of an arbitrary nonlinearity followed by a coherent detector and an envelope detector on SNR is performed. Our analysis leads to the expression of the improvement factor which is applicable to noise with an arbitrary amplitude distribution. It is found that output SNR can be improved by combining these two detectors appropriately.