3.5. Summary
Selecting an appropriate modulation scheme is a critical design decision in UWB communications systems. Data modulation can directly affect the performance of UWB receivers in the presence of various channel conditions, such as multipath, multiple access, and various forms of interference. The proper modulation technique can also prevent a UWB device from causing harmful interference to existing radio services. This is done by reducing the number of discrete spectral lines on the UWB pulse's PSD, also called spectral smoothing. The data rate can also be affected by the modulation method used to transmit and receive data. Therefore, depending on the specific application, each of these design considerations should be taken into account ...
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