  Geographic routing protocols greatly reduce the requirements of topology
storage and provide flexibility in the accommodation of the dynamic behavior of
ad hoc networks. This paper presents performance evaluations and comparisons of
two geographic routing protocols and the popular AODV protocol. The trade-offs
among the average path reliabilities, average conditional delays, average
conditional number of hops, and area spectral efficiencies and the effects of
various parameters are illustrated for finite ad hoc networks with randomly
placed mobiles. This paper uses a dual method of closed-form analysis and
simple simulation that is applicable to most routing protocols and provides a
much more realistic performance evaluation than has previously been possible.
Some features included in the new analysis are shadowing, exclusion and guard
zones, and distance-dependent fading.
