Accession Number : AD0476982
Title : Output Signal-to-Noise Ratio as a Criterion in Spread-Channel Signaling
Descriptive Note : Technical rept.
Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
Personal Author(s) : Price, Robert
Report Date : 13 May 1965
Pagination or Media Count : 43
Abstract : In transmission and receiver design for radar or communication systems whose noisy channels contain Gaussianly fluctuating multipath, it is convenient to adopt a receiver output signal-to-noise ratio (SNR) criterion even though best error performance is actually sought. We investigate the loss (expressed as an equivalent transmitter output reduction) attending the use of this criterion. It is shown that when a Karhunen-Loeve analysis of the signaling system yields a largest eigenvalue that is suitably small, this loss is minor or negligible at all levels of error probability. Furthermore, it is easily possible to have a channel-perturbed transmission that is sufficiently weak and incoherent for this eigenvalue to guarantee low loss, yet not so weak that high output SNR (good error performance) is precluded.
Descriptors : *RADAR RECEIVERS , *RADAR SIGNALS , *RADIO ASTRONOMY , COMMUNICATION AND RADIO SYSTEMS , DETECTION , ERRORS , FUNCTIONS(MATHEMATICS) , INFORMATION THEORY , NOISE(RADAR) , PROBABILITY , PROCESSING , RADAR TRANSMITTERS , RADIOMETERS
Subject Categories : Cybernetics
Distribution Statement : APPROVED FOR PUBLIC RELEASE