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The Effects of a Multipath Channel and Interference on Coherent M-PSK digital Communication Systems.
Final rept. Oct 92-Sep 93,
NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
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This report derives expressions for the average probability of symbol error of coherent M-ary phase-shift-keyed M-PSK communication system operating under the following nonideal conditions 1 time-invariant multipath channel consisting of a direct path and a single multipath, 2 intentional unintentional interference consisting of either a continuous wave CW signal or a bandpass filtered white Gaussian noise signal bandwidth is variable, and 3 additive white Gaussian noise. Exact solutions are derived for coherent binary phase shift-keyed BPSK while both exact and upper bound solutions shown to be tighter than the Chernoff bound are derived for coherent M-PSK. One particular example, line-of-sight ultrahigh frequency LOS UHF radio, is used extensively to exercise the derived expressions and illustrate typical system performance. These results pertain to receiver with no means of compensation for the nonideal channel conditions. Methods of compensation for multipath and interference, like adaptive equalization, beamforming, spatial diversity, and multichannel adaptive equalization, are presently under investigation by the authors. The results in this report will help determine the performance gain offered by these methods of compensation
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