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Full-Text Articles in Physical Sciences and Mathematics
On The Effect Of Multiple Access Interference In A Space Time Spreading Time Hopping Ppm Uwb System, Peter Vial, Beata Wysocki, Tadeusz Wysocki, Montserrat Ros, David Stirling
On The Effect Of Multiple Access Interference In A Space Time Spreading Time Hopping Ppm Uwb System, Peter Vial, Beata Wysocki, Tadeusz Wysocki, Montserrat Ros, David Stirling
Dr Peter Vial
This study investigates the effect of multiple sources using STS across a Time-Hopping-PPM Modulation that is over an UWB Saleh-Valenzuela channel with each source using two transmit antennas. We model and analyze this system, showing that the presence of such MAI results in a significant degradation in BER performance. Simulation results show that for strong signal strength of interfering MAI signals degradation in BER performance is observed for the cases where we have five and 10 distinct MAI sources present when using Walsh-Hadamard thirty two chip spreading sequences. Using simulation, we investigate the use of other sets of orthogonal spreading …
Design And Simulation Of A Ds-Th-Uwb System Using Simulink/Matlab For First Arriving Rays In A Non Line Of Sight Wireless Scenario, Peter Vial
Dr Peter Vial
An Ultra Wideband system was developed using Simulink in previous work. Using this developed model for Ultra Wideband (UWB) Pulse Position Modulation (PPM) within Simulink, we apply Direct Sequence Walsh codes across Time Hopping Patterns to smooth out the spectral characteristics with Pulse Position Modulation. A non-line of sight Saleh-Valenzuela (SV) model is used to characterize the wireless channel. The system is described and results are presented for the scenario where the first arriving rays are used to detect the transmitted message. For this non-optimum technique (in that for non line of sight the strongest signal rays are available after …