Daniel H. Cronin and 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

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