December 1983 | NTIA Technical Report TR-83-139
The Effect of Bandwidth and Interference Rejection on the Spectrum Efficiency of Land Mobile Radio Systems
Daniel H. Cronin; Leslie A. Berry
Abstract: Analytical and empirical results concerning the relative spectrum efficiency of twogenerjc (wideband and narrowband) land mobile radio systems are presented. Graph theoretic frequency assignment techniques are used to relate spectrum usage to transmitter bandwidth, interference rejection characteristics, t ransmi tter 1ocati ons, frequency assignment techniques, and other system and deployment characteristics. A curve–fit equation is presented for estimating the amount of spectrum needed to assign frequencies to transmitters of both types when they are randomly located in a square geographical area. Spectrum usage when transmitters are located at preferred sites or clustered near city centers is also discussed. In most cases considered the narrowband systems use less spectrum than the wideband systems even though the narrowband systems requi re greater protection from cochannel interference.
Keywords: spectrum efficiency; frequency assignment; spectrum management; graph theory
To request a reprint of this report, contact:
Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.