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WiMedia Alliance(WiMedia Alliance, Inc., San Ramon, CA, www.wimedia.org) A membership organization founded in 2002 devoted to the development of short-range, ultra-wideband (UWB) transmission. In 2005, the Multiband OFDM Alliance merged with WiMedia Alliance to promote a single standard based on multiband OFDM (MB-OFDM). ECMA has also standardized this technology under ECMA-368 and ECMA-369. See UWB.