August 2005
Intermediate to advanced
240 pages
4h 32m
English
Content preview from Ultra-Wideband Communications: Fundamentals and Applications
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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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