Emulab

http://www.emulab.net/index.php3?stayhome=1

Emulab provides integrated access to a wide range of experimental environments:


Emulation
An emulated experiment allows you to specify an arbitrary network topology, giving you a controllable, predictable, and repeatable environment, including PC nodes on which you have full "root" access, running an operating system of your choice.


Live-Internet Experimentation
Using the RON and PlanetLab testbeds, Emulab provides you with a full-featured environment for deploying, running, and controlling your application at hundreds of sites around the world.


802.11 Wireless
Emulab's 802.11a/b/g testbed is deployed on multiple floors of an office building. Nodes are under your full control and may act as access points, clients, or in ad-hoc mode. All nodes have two wireless interfaces, plus a wired control network.


Software-Defined Radio
USRP devices from the GNU Radio project give you control over Layer 1 of a wireless network - everything from signal processing up is done in software.