Coding and Quantization Losses for the Coherent White Gaussian Channel.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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Communication of binary data over an additive white Gaussian channel by means of coded transmission over coherent phase-shift keyed modems is considered. It is found that for high rate codes and coarse receiver output quantization, the minimum value of E sub bN sub 0 required for reliable communication is significantly higher than the Shannon limit of -1.6 dB. for the raw channel. This loss of efficiency is investigated quantitatively as a function of code rate and coarseness of quantization, and shown to be negligible for low rate code with fine quantization. Similar results are presented showing the minimum E sub bN sub 0 ratio for operation in the region where a sequential decoder performs finite average computation. In connection with this, tables and curves are given which show the value of the Pareto parameter rho as a function of E sub bN sub 0. Author