Effect of bandwidth and interference rejection on the spectrum efficiency of land mobile radio systems

Analytical and empirical results concerning the relative spectrum efficiency of two generic land mobile radio systems are presented. Graph theoretic frequency assignment techniques are used to relate spectrum usage to transmitter bandwidth, interference rejection characteristics, transmitter locations, 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.