Amplitude and phase demodulation of filtered AM/PM signals

by Edward Bedrosian

Purchase Print Copy

 FormatList Price Price
Add to Cart Paperback50 pages $23.00 $18.40 20% Web Discount

An important problem in the design and analysis of communication systems is determining the distortion experienced by a modulated signal when it is passed through a linear bandpass filter and then demodulated. In this paper, the input signal is assumed to be simultaneously amplitude and phase modulated and the bandpass filter may be unsymmetrical and mistuned. The demodulator output is the magnitude of the filtered signal for an AM receiver or its phase for a PM receiver. The results are in the form of an expansion in which the leading term is the linear (i.e., undistorted) reproduction of the input AM and PM and the successive terms represent the distortion. In both cases, the significant effects are given by the first few terms of the expansions because the applications of interest are those in which the interference is small. Finally, a spectral analysis is performed on the output of an AM receiver.

This report is part of the RAND Corporation paper series. The paper was a product of the RAND Corporation from 1948 to 2003 that captured speeches, memorials, and derivative research, usually prepared on authors' own time and meant to be the scholarly or scientific contribution of individual authors to their professional fields. Papers were less formal than reports and did not require rigorous peer review.

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.