Accession Number:

AD0646972

Title:

MAXIMUM UTILIZATION OF FM SUBCARRIER BANDWIDTH,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1967-01-06

Pagination or Media Count:

29.0

Abstract:

In FM-FM telemetry and other frequency-division systems, maximum utilization of the FM subcarrier bandwidth is achieved if the generated spectrum width arising from modulation of the subcarrier is maintained equal to the receiving-equipment bandwidth. This equality must hold for all values of the data modulation frequency from zero to one-half the receiving-equipment bandwidth, if the available system performance is to be fully exploited. A technique for optimization of subcarrier information capacity OSIC ensures such operation. The magnitude of subcarrier frequency deviation is varied as a function of the input data frequency to achieve simultaneously optimum data resolution, signal-to-noise ratio, and frequency response. Experimental studies have validated the design concept, and a theoretical comparison has been made between the performance of systems based upon present approaches and the OSIC constant-bandwidth approach. In the opinion of the authors, a significant contribution of this study is the development of a long-needed figure of merit for evaluation of FM subcarrier system performance. Author

Subject Categories:

  • Cybernetics
  • Telemetry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE