Ultra Wide Band

UWB is a wireless technology that transmits binary data—the 0s and 1s that are the digital building blocks of modern information systems. It uses low-energy and extremely short duration (in the order of pico seconds) impulses or bursts of RF (radio frequency) energy over a wide spectrum of frequencies, to transmit data over short to medium distances, say about 15—100 m. It doesn’t use carrier wave to transmit data.
Current radio technology – picture a guy watering his lawn with a garden hose
and moving the hose up and down in a smooth vertical motion.You can see a continuous stream of water. Nearly all radios, cell phones, wireless LANs and so on are like that: a continuous signal that’s overlaid with information by using one of several modulation techniques.
UWB technology – picture the same guy watering his lawn with a swiveling
sprinkler that shoots many, fast, short pulses of water. That’s typically what UWB is like: millions of very short, very fast, precisely timed bursts or pulses of energy, measured in nanoseconds and covering a very wide area. By varying the pulse timing according to a complex code, a pulse can represent either a zero or a one: the basis of digital communications.
Advantages – Current UWB devices can transmit data up to 100 Mbps, compared to the 1 Mbps of Bluetooth and the 11 Mbps of 802.11b. It’s expected to reach around 500 Mbps by 2004. Also, this low power pulse can penetrate obstacles like doors, walls, metal etc. It doesn’t require allocation of ‘precious’ or ‘paid for’ narrow-band spectrum, in use now. Best of all, it costs a fraction of current technologies like Blue-tooth, WLANs and Wi-Fi. UWB doesn’t suffer from multi-path interference (where signals reach the receiver after traveling through two or more paths). Hence, it can be used in densely built-up places, or where number of users are more than what is supported by Wi-Fi, Blue-tooth etc.A UWB phone uses so little power that it can remain on for weeks without recharging.

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