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Úvod > Diskuse > Obecná diskuse > UWB na postupu

UWB na postupu

Anonym (17.1.2006 00:00:00)

Technologie UWB slibuje přinést revoluci v bezdrátových multimediálních sítích. Pokud se všechno povede.

Intel (17.1.2006 15:04:07)

Pokud už někdo vykrádá několikaodstavcové segmenty cizího textu, mohl by se alespoň obtěžovat uvést zdroj a překládat tak, aby to dávalo smysl. "Tradiční vysílání UWB" je věru perla. "...A traditional UWB transmitter works by sending billions of pulses across a very wide spectrum of frequencies several GHz in bandwidth. The corresponding receiver then translates the pulses into data by listening for a familiar pulse sequence sent by the transmitter. Specifically, UWB is defined as any radio technology having a spectrum that occupies a bandwidth greater than 20 percent of the center frequency, or a bandwidth of at least 500 MHz. Modern UWB systems use other modulation techniques, such as Orthogonal Frequency Division Multiplexing (OFDM), to occupy these extremely wide bandwidths. In addition, the use of multiple bands in combination with OFDM modulation can provide significant advantages to traditional UWB systems. UWB's combination of broader spectrum and lower power improves speed and reduces interference with other wireless spectra. In the United States, the Federal Communications Commission (FCC) has mandated that UWB radio transmissions can legally operate in the range from 3.1 GHz up to 10.6 GHz, at a limited transmit power of -41dBm/MHz. Consequently, UWB provides dramatic channel capacity at short range that limits interference..."