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Ultra-Wideband Communications: Fundamentals and Applications by Faranak Nekoogar

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1.3. UWB Concepts

Traditional narrowband communications systems modulate continuous-waveform (CW) RF signals with a specific carrier frequency to transmit and receive information. A continuous waveform has a well-defined signal energy in a narrow frequency band that makes it very vulnerable to detection and interception. Figure 1-2 represents a narrowband signal in the time and frequency domains.

Figure 1-2. A narrowband signal in (a) the time domain and (b) the frequency domain

As mentioned in Section 1.2, UWB systems use carrierless, short-duration (picosecond to nanosecond) pulses with a very low duty cycle (less than 0.5 percent) for transmission ...

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