University of Twente Student Theses


Successful Communication Over a Wireless Link Under the Presence of Other Users

Karampatsos, Ilias (2014) Successful Communication Over a Wireless Link Under the Presence of Other Users.

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Abstract:The goal of this Master Thesis was to examine the impact of interference on wireless communication under the scope of throughput efficiency. The research focused on two domains. The first domain was the coexistence of wireless systems in the Licence Excempt (LE) domain. The sensitivity of QPSK, 16 QAM, and GFSK modulation systems against interference was investigated. Such measurements can be used to optimize the Medium Usage(ME) by reducing the spatial overlap of interfering systems. The interference of a multicarrier system (802.11g) and a frequency hopping system (Bluetooth) was evaluated through Simulink. The simulations were performed in a flat fading environment.The second domain of investigation was the comparison of Convolutional Coding (CC), Interleaving, and Hard Decoding(HD) versus the Opportunistic Error Correction (OEC) scheme under narrowband interference. The superiority of the OEC scheme, under constant frequency narrowband interferer and under flat and multipath fading was concluded. Finally, the performance of these schemes versus a Bluetooth jammer signal was investigated through measurements. The measurements were inconclusive about which system is superior, under the same effective throughput requirement. Nevertheless, they showed the ability of the OEC scheme to provide successful communication under Bluetooth interference at a constant frequency.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering MSc (60353)
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