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.
UWB is fundamentally
different from existing radio frequency technology. For radios today, 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 in an undulating
wave. 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
Now 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.
technologies such as 802.11b and short-range Bluetooth radios eventually could
be replaced by UWB products that would have a throughput capacity 1,000 times
greater than 802.11b (11M bit/sec). Those numbers mean UWB systems have the potential
to support many more users, at much higher speeds and lower costs, than current
wireless LAN systems. Current UWB devices can transmit data up to 100 Mbps, compared
to the 1 Mbps of Bluetooth and the 11 Mbps of 802.11b. Best of all, it costs a
fraction of current technologies like Blue-tooth, WLANs and Wi-Fi.
concepts of communication and computation are so close that their tight connection
is obvious even for PR departments of major IT companies. Quite often it makes
no sense to separate these concepts. Today, speaking about growing power of computing
devices we imply both growing performance of their processors and growing throughput
of their communication channels. The communication channels include internal:
" system buses
" memory interfaces
" interfaces of storage devices
" interfaces of peripherals
" wireless network channels
" wired network channels
structures of data transfer.
wired communication channels are developing mainly in two directions - cost reduction
and increase of availability of optical channels (top-down) and growth of throughput
(bottum-up). However, the two physical carriers are not so close yet (first of
all, in prices) to be involved in direct competition - in 90% of cases a character
of a problem to be solved determines the technology to be preferred.
wired channels are switching over from specialized parallel interfaces to high-level
serial packet interface (Serial ATA, 3GIO/PCI Express, Hyper Transport). It fosters
a convergence of external and internal communication technologies: in future separate
components of a computer case will be combined into a normal network. It's quite
a logical solution - a modern chipset, thus, works as a network switch equipped
with multiple interfaces such as a DDR memory bus or a processor bus and AGP/PCI.
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