  Geographic routing protocols greatly reduce the requirements of topology
storage and provide flexibility in the accommodation of the dynamic behavior of
mobile ad hoc networks. This paper presents performance evaluations and
comparisons of two geographic routing protocols and the popular AODV protocol.
The tradeoffs among the average path reliabilities, average conditional delays,
average conditional numbers 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, distance-dependent fading, and interference correlation.
