PRINCIPLES OF SYSTEMATIC CODING FOR ERROR CORRECTION.
Rept. for Jan 62-Mar 63,
AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO ELECTRONIC WARFARE DIV
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The report is essentially an elementary discus sion of the principles of systematic, or group binary codes as used in digital type communications systems. Structure and character istics of typical short codes are explained first in systematized arrangements called stand ard arrays and then are given additional physi cal and intuitive significance by a geometric model. A simple model of a one-way digital communication system is used to illustrate a complete single error correction encoding-decod ing process from input signal to error corrected output. The importance and salient features of maximum likelihood detection are stressed. The cost and effectiveness of simple codes are discussed in general terms. Evaluation factors in common use are described and their advantages and disadvantages discussed. The problem of comparing the information transfer efficiency of coded and uncoded systems is considered and quantitative results are given for a couple of simple short codes. Author