Researchers at the US Defense Advanced Research Projects Agency (DARPA) have successfully demonstrated an ad-hoc-networking technology that allows several users to occupy the same time and frequency slot.

DARPA strategic technology office programme manager Bruce Fette said that during the demonstration of DARPA interference multiple access (DIMA), five mobile transmitters delivered signals at a speed of up to 60mph over 5MHz of spectrum to a single transmitter.

“The DIMA system could track real-time artefacts of mobility with multiple vehicles operating in an urban environment, and receive multiple signals at the same time on the same frequencies,” he said.

Fette added that the system had achieved a maximum data-throughput rates of 5.2Mbps in the demonstration, which can be further increased.

Wireless network after next (WNaN) features ad-hoc networking between cognitive radios that automatically find usable spectrum, and serve as nodes to route voice and data information to each other, according to

In October 2009, DARPA conducted a WNaN demonstration using a 10-node network. It is scheduled to conduct another demonstration using 50 network nodes this month, Fette said.

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