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Interference Effects of Multi-User Ultrawideband (UWB) Communication Systems

Ultrawideband (UWB) communication systems are based on the transmission and reception of extremely short duration (picosecond or nanosecond) bursts of radio-frequency energy. The resulting waveforms have extremely wide bandwidth, on the order of multiple gigahertz. Because the signal energy is spread over such a wide bandwidth, UWB signals may contribute relatively little interference to other systems that share portions of the UWB communications band. Multiple UWB signals can share a frequency band through a technique known as time-hopping.

The project involved modeling a number of UWB transmitters to calculate the interference noise level at a victim receiver, picked to be a certain distance away. The model for the transmitters turning on and off was based on a Markov chain, and the UWB signals were viewed as Gaussian noise; initially the analysis was done where all the transmitters were at a constant distance away from the receiver. An event-driven Monte Carlo simulation was then developed on MATLAB to represent a random-distance distribution of multiple transmitters. This led to the conclusion that many transmitters may cause major problems in worst cases, thus it is very important to thoroughly examine those cases.

Final PowerPoint Presentation (1.5 MB)

Final Poster (900 KB, PowerPoint)