Accession Number:

AD0404621

Title:

THRESHOLDS FOR SEVERAL ANALOG MODULATION SYSTEMS

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

Report Date:

1963-05-06

Pagination or Media Count:

11.0

Abstract:

The onset of a threshold in communication systems is a familiar phenomenon. Threshold is defined as an abrupt degradation in performance when the sn ratio at the input to the detector falls below some more or less critical level. Two common examples are 1 the conventional FM threshold when a discriminator is the detector for angle-modulated signals, and 2 the small signal suppression effect when power law detectors are used for AM signals. This report is intended as a compilation of selected works of others on the thresholds of several analog modu lation schemes operating in additive white, gaussian noise. One threshold curve derived from information theory considerations, may be interpreted as representing the best possible performance of a broad class of modulation demodulation schemes. The remaining threshold curves refer to angle modulation and various demodulators.

Subject Categories:

  • Radio Communications
  • Cybernetics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE