MAXIMUM UTILIZATION OF FM SUBCARRIER BANDWIDTH,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 06, 1967
- Accession Number
- AD0646972
Entities
People
- John E. Abel
- Paul T. Stine
Organizations
- United States Naval Research Laboratory