University of Twente Student Theses


Assessing the benefits of spectrum sharing in wireless access networks

Noppen, I. (2012) Assessing the benefits of spectrum sharing in wireless access networks.

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Abstract:In this thesis, we analyse the potential gain in capacity and performance of the non-orthogonal SAPHYRE project transmission schemes when simulated in a system-level simulator with a realistic model including multiple users, propagation models and trafic models. We compare the results of the simulations with results for the uncoordinated orthogonal scenario, and the coordinated orthogonal scenario, as well as for ZF beamforming in the coordinated non-orthogonal scenario. We also introduce some methods to deal with coordinated scheduling for MSR, PF and MM scheduling. Furthermore, we show in a sensitivity analysis how sensitive the SAPHYRE transmission schemes are with regards to feedback delay, feedback error and interference of surrounding cells. We show that, with the SAPHYRE transmission schemes, an almost twofold increase in average user throughput and 10th percentile throughput can be reached when compared to the uncoordinated orthogonal scenario. For the coordinated orthogonal scenario the results are lower, but still a decent improvement. Furthermore, we show that we can also increase the system throughput almost twofold when the system is fully loaded with the SAPHYRE schemes. With lower loads, the throughput decreases to the same values as the orthogonal scenarios. With respect to ZF, we show that the SAPHYRE schemes are of similar performance. Lastly, we show that the MSR scheduling algorithm is more resilient to feedback error and interference of surrounding cells than the PF algorithm with SAPHYRE transmission schemes. Both scheduling algorithms are not affected by a delay of up to 8 Transmission Time Intervals (TTIs), for the pedestrian users included in our model.
Item Type:Essay (Master)
Netherlands Organisation for Applied Scientic Research (TNO), the Netherlands
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Computer Science MSc (60300)
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