If you're trying to understand the technology, conflicts in UWB and 802.11n, read this article: The folks at Nikkei Electronics Asia have written and illustrated a fantastically exhaustive, well-written explanation of the current state of ultrawideband (UWB) and 802.11n, including the differences between the competing Task Group N proposals. The illustrations finally make clear to me a few intricacies that no amount of talking ever got through: note particularly the closed loop issue that remains a sticking point (as a mandatory feature) between WWiSE and TGn Sync proposals.