
Accession Number : AD0781845
Title : Error Probability Characteristics for Orthogonal Multiple Alternative Communication with DFold Diversity.
Descriptive Note : Technical rept.,
Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB
Personal Author(s) : Nuttall,Albert H.
Report Date : 19 JUN 1974
Pagination or Media Count : 48
Abstract : The error probability characteristics for orthogonal multiple alternative (Mary) communication with Dfold diversity are plotted for M = 2, 3, 4, 8, 16, 32, 64 and for D = 1, 2, 3, 4, 5, 6, 8, 12, 16, 24, 32, 48, 64 in a range of Mary character error probabilities Pe from 0.1 to 0.00001. The curves are plotted in two ways  versus the total signalenergy tonoisedensity ratio and versus the signalenergytonoisedensity ratio per diversity branch. These curves permit quick determination of the optimum number of diversity branches D to employ for specified values of M and Pe and the required average total received signalenergytonoisedensity ratio. The curves also afford quantitative measures of the losses incurred by not employing the optimum number of diversity branches, such as might be imposed by a limited bandwidth. Bandwidth requirements are discussed for frequency diversity, and a signal design example using the above curves for a simple tradeoff study is presented. (Author)
Descriptors : *Communication and radio systems, *Information theory, Signal to noise ratio, Fading(Electromagnetic waves), Probability density functions, Statistical analysis, Computer programs, Signal processing
Subject Categories : Cybernetics
Nonradio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE