Accession Number : AD0287162

Title :   COMMENTARY ON A PAPER BY KUKLEV CONCERNING THE INFLUENCE OF NOISE ON A DECODING UNIT USING A PULSE CODE GROUP

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : MIDDLETON,DAVID

Report Date : 31 JUL 1962

Pagination or Media Count : 1

Abstract : A 1959 paper by Kuklev, which discusses the effects of noise on a decoding unit employing a pulse code group of up to five pulse elements, is examined from the viewpoint of (1) the basic model assumed, (2) the validity of the approximations involved and (3) the accuracy of the calculations presented. A translation of Kuklev's paper is given. In the detailed commentary presented, the signal detection probability is obtained as a function of the input signal-to-noise (power) ratio at the input to the second detector before rectification and video limiting. This probability is obtained for conditions of both match and mismatch in the IF, and for one to five pulse elements in a code group, subject to a preset false-alarm probability of 1/1000, and to various approximations. Kuklev's basic model is found to be satisfactory and his approximations in most instances are reasonable. However, the accuracy of his calculations can be noticeably improved by more refined approximations. Calculations are presented for false-alarm probabilities different from the values considered by Kuklev. These calculations show the required increase in input signal level as the number of pulses in the code group is increased. (Author)

Descriptors :   *COMMUNICATION THEORY, *RADIO INTERFERENCE, *RADIO SIGNALS, CODING, DETECTION, ERRORS, IDENTIFICATION, MATHEMATICAL ANALYSIS, PULSE MODULATION, SIGNAL-TO-NOISE RATIC, STATISTICAL ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE