Accession Number : AD0786371

Title :   Operating Characteristics for Detection of a Fading Signal in M Alternative Locations with D-Fold 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 : 20 AUG 1974

Pagination or Media Count : 68

Abstract : The probabilities of correct decision and false alarm for a fading signal in M alternative locations with D-fold diversity are derived and numerically evaluated over the range of values M = 1, 2, 4, 16, 64, 256, 1024 and D = 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64 for a wide range of signal-energy-to-noise-density-level ratios (ENR). These results which apply to the optimum receiver processor, have relevance to synchronization as well as to multiple alternative communication with thresholding. It is found that the optimum order of diversity does not correspond to the familiar 5 dB ENR per branch, but rather to ENR branch values as large as 14 dB for some cases of small false-alarm probability and moderate correct-decision probability. (Modified author abstract)

Descriptors :   *Information theory, *Signal processing, *Message processing, Fading(Electromagnetic waves), Probability, Errors, Signal to noise ratio, Curve fitting, Graphics, Computer programs

Subject Categories : Cybernetics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE