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Pulse position modulation (PPM) is a popularly adopted modulation scheme in the impulse radio based ultra wideband (UWB) systems. In order to shape the spectrum of the signal, a time dither on generated pulses leading to so-called Time Hopping UWB (TH-UWB) is introduced. Although of many advantages, the TH-PPM scheme faces serious challenges which are the cross modulation interference (CMI) and the...
Three-level converters have been used for dc-ac conversion when the desired ac voltages are balanced. To deal with the unbalanced situations, three-level four-leg converters have been proposed. The four-leg converters use an extra leg to conduct any neutral current in a three-phase four-wire system. More switching devices in the four-leg converters result in increased cost and possibly increased switching...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.