A general analytical framework quantifying the spectral efficiency of cellu
lar systems with variable-rate transmission is introduced. This efficiency,
the area spectral efficiency, defines the sum of the maximum average data
rates per unit bandwidth per unit area supported by a cell's base station.
Expressions for this efficiency as a function of the reuse distance for the
worst and best case interference configurations are derived. Moreover, Mon
te Carlo simulations are developed to estimate the value of this efficiency
for average interference conditions. Both fully loaded and partially loade
d cellular systems are investigated. The effect of random user location is
taken into account, and the impact of lognormal shadowing and Nakagami mult
ipath fading is also studied.