The WiMedia Alliance was a non-profit industry trade group that promoted the adoption, regulation, standardization and multi-vendor interoperability of ultra-wideband (UWB) technologies.

[1] The WiMedia Alliance developed reference technical specifications including: The WiMedia ultra-wideband (UWB) common radio platform incorporated MAC layer and PHY layer specifications based on multi-band orthogonal frequency-division multiplexing (MB-OFDM).

It was intended for short-range multimedia file transfers at data rates of 480 Mbit/s and beyond with low power consumption, and operates in the 3.1 to 10.6 GHz UWB spectrum.

WiMedia UWB was promoted for personal computers, consumer electronics, mobile devices and automotive networks.

[2] The ultra-wideband system provided a wireless personal area network (WPAN) with data payload communication capabilities of 53.3, 55, 80, 106.67, 110, 160, 200, 320, 480, 640, 800, 960, and 1024 Mbit/s.

Board members of the alliance included Alereon, CSR plc, Olympus Corporation, Samsung and Wisair.

The attempt to create an Institute of Electrical and Electronics Engineers (IEEE) ultra-wideband standard failed because of several factors.

There were several attempts to create a compromise solution, the most notable was a proposal that would have allowed the MB-OFDM and DS-UWB radios to communicate with each other and share spectrum.

Based on a concept called the Common Signaling Mode (CSM) it specified supporting a lower data rate than the minimum mandatory 110 Mbit/s, for purposes of spectrum coordination and allowing other elements necessary for proper operation of a wireless personal area network.

Bob Heile was replaced by Jim Lansford, CTO of Alereon, and Gregg Rasor, Director of Ultrawideband Research and Development in Motorola Labs, who co-chaired IEEE 802.15.3a until its end.