UWB(Ultra Wideband) is a carrierless communications technology, using femtosecond seconds to level on the sine wave narrow pulses transmitted data. Some called it a revolutionary for radio spectrum, thinks it will become the progress of short-range wireless communication future mainstream technology.
UWB (the mk-ultra - Wideband) ultra-wideband, starting with using pulse radio technology, the technology can be traced back to the 19th century. Then by big companies such as Intel paper presents the application of the UWB technology program MB a - OFDM because of the two schemes are entirely different, and each has powerful faction, UWB standards formulated support 802.15.3 a workgroup could not decide in both the standard solutions, and eventually to market its solution. UWB still debate so far. UWB pulse width modulation using level in ns fast rising and falling pulse, pulse from dc to cover the spectrum of GHz, do not need regular narrowband modulation of RF frequency conversion needed, pulse forming can directly send it to antenna launch. Pulse fengfeng time interval from 10 to 100 ps level. What shape can narrow spectrum through continuous monopulse shape and antenna load characteristics to adjust. WB signal in time axis is sparse distribution, the power spectral density quite low, RF can simultaneously launching multiple UWB signal. UWB signal is similar to baseband signal, can use OOK, mirror pulse keying, pulse amplitude modulation or pulse position modulation. UWB is different from the baseband signal is transformed into radio frequency (RF) of conventional wireless system, which can be regarded as the baseband spread in RF programs in building internal energy spectrum density with extremely low 100 Mb/s data rate.
To further improve the data rate, UWB application ultrashort baseband rich GHz spectrums, use safe level of Signaling Signaling Method (Intriguing. Based on the broad spectrum UWB in 2002, the FCC announced UWB can be used for accurate location, metal detector, a new generation of WLAN and wireless communications. To protect the GPS, navigation and military communication frequency UWB limit, in 3.1 - GHz and below 41 dB 10.6 transmission power.
To further improve the data rate, UWB application ultrashort baseband rich GHz spectrums, use safe level of Signaling Signaling Method (Intriguing. Based on the broad spectrum UWB in 2002, the FCC announced UWB can be used for accurate location, metal detector, a new generation of WLAN and wireless communications. To protect the GPS, navigation and military communication frequency UWB limit, in 3.1 - GHz and below 41 dB 10.6 transmission power.
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