Accession Number : AD0761465

Title :   Coding and Quantization Losses for the Coherent White Gaussian Channel.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Nualprasert,Boon J. Rit

Report Date : DEC 1972

Pagination or Media Count : 39

Abstract : 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 b)/(N 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 b)/(N 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 b)/(N sub 0). (Author)

Descriptors :   (*CODING, DATA TRANSMISSION SYSTEMS), WHITE NOISE, PHASE SHIFT CIRCUITS, MODULATORS, DEMODULATORS, DECODING, POWER SPECTRA, PROBABILITY DENSITY FUNCTIONS, THESES

Subject Categories : Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE