audio/ video players, mobile phones, laptop computers, and other mobile devices. The growing presence of wired connections to the Internet is another driver of short- distance wireless technology. Many in the developed world already spend most of the day within 30 feet (10 m) of some kind of wired link to the Internet. UWB's precision pulses give it the ability to discern buried objects or movement behind walls. It can also be used to determine the position of emitters indoors. UWB provides a location-finding feature, much like a local version of GPS. UWB capabilities are therefore crucial to rescue and law-enforcement missions. One drawback of UWB is that it is susceptible to interference from other emitters. The ability of a UWB receiver to overcome this problem is sometimes called jamming resistance. This is a key characteristic of good receiver design. Multipath interference is also an issue, and one that also needs to be addressed in the receiver design. UWB Applications Key UWB applications include communications, imaging, telematics, location tracking, and various military and government applications. UWB also has the key attributes necessary to add significant value for consumers of wireless home enter- tainment and mobile multimedia products. Smart phones, media servers, set-top boxes, flat-panel screens, digital camcorders, and other multimedia applications need a high-data-rate and high-QoS wireless connection to help ensure wire-like performance. UWB applications cover a wide range of scenarios, including the following: Monitoring large numbers of sensors dispersed over an area for nuclear, biological, or chemical threats Conducting geospatial registration for warfighter visualization Supporting survey and construction needs Keeping track of mines, armaments, equipment, vehicles, and SO on Keeping track of personal items, such as one's children, pets, car, purse, luggage, and SO on Controlling inventory in stores, warehouses, shipyards, railyards, and SO on Arbitrating rules in a sporting event, provi