The PicoRadio project at Berkeley is aiming at developing “meso-scale low cost (< 50 cents) transceivers for ubiquitous wireless data acquisition that minimizes power/energy dissipation.”. The NAMP subgroup are using OMNeT++ to model parts of the system. They have built an IEEE802.11 model, etc. http://bwrc.eecs.berkeley.edu/Research/Pico_Radio/