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Understanding Ultra Wide Band Radio Fundamentals by Guerino Giancola - University of Rome La Sapienza, Maria-Gabriella Di Benedetto - University of Rome La Sapienza

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Chapter 2 The UWB Radio Signal

The most common and traditional way of emitting an UWB signal is by radiating pulses that are very short in time. This transmission technique goes under the name of Impulse Radio (IR). The way by which the information data symbols modulate the pulses may vary; Pulse Position Modulation (PPM) and Pulse Amplitude Modulation (PAM) are commonly adopted modulation schemes (Welborn, 2001; Guvenc and Arslan, 2003). In addition to modulation and in order to shape the spectrum of the generated signal, the data symbols are encoded using pseudorandom or pseudonoise (PN) codes. In a common approach, the encoded data symbols introduce a time dither on generated pulses leading to the so-called Time-Hopping UWB (TH-UWB). Direct-Sequence ...

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