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time domain, according to Formula BW×T ≥4/π, which expresses the connection between bandwidth (BW) and pulse duration (T). For traditional communication technologies such as WiFi, bandwidths are limited to e.g. 20 MHz, resulting in a pulse width larger than 4 nanoseconds. In contrast, UWB systems of 500 MHz have time pulses of only 0.16 ns ...
UWB communication is achieved by sending ultra-short, time-domain pulses in predefined bursts and sequences to achieve different functionalities. A single pulse can be less than 1ns long, which results in a very large bandwidth in the frequency domain.
Using timestamped signals, UWB calculates the time for signals to travel between devices, then multiplies the time by the signal speed (speed of light) to obtain the distance. Figure 2 shows the advantage of using ToF to calculate distance in an indoor environment.
The use of very short RF pulses. Since short pulses have very wide frequency bandwidth, it is termed “Ultra WideBand” or “UWB”. FCC defines UWB as a 10 dB bandwidth > 500 MHz or > 20%. TDC’s systems are typically > 2 GHz and > 60%. Actual UWB Pulse and Its Spectrum.
It is characterized by its ability to generate and transmit radio-frequency energy over an extensive frequency range. This paper provides an overview of UWB technology including its defini-tion, two representative schemes and some key characteristics distinguished from other types of communication.
This book presents the theory, analysis, and design of ultra-wideband (UWB) radar and sensor systems (in short, UWB systems) and their components. UWB systems find numerous applications in the military, security, civilian, commercial and medicine fields.
In time domain, the zero-crossing number increases as the differentiation order increases; while in frequency domain, the higher the differentiation order, the higher the center frequency with no significant change on the signal bandwidth, as shown in Fig. 6. Therefore, in an IR-UWB transm itter, frequency conversion is performed by differentiation
