Accession Number : AD0646972

Title :   MAXIMUM UTILIZATION OF FM SUBCARRIER BANDWIDTH,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Abel,John E. ; Stine,Paul T.

Report Date : 06 JAN 1967

Pagination or Media Count : 29

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)

Descriptors :   (*TELEMETER SYSTEMS, FREQUENCY MODULATION), BANDWIDTH, OPTIMIZATION, INFORMATION THEORY, MULTIPLEXING, PERFORMANCE(ENGINEERING)

Subject Categories : Cybernetics
      Telemetry

Distribution Statement : APPROVED FOR PUBLIC RELEASE