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Title: Packet scheduling in wireless systems using MIMO arrays and VBLAST architecture
Author: Floros, Constantine I.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2006
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This thesis aims to examine ways of increasing the spectral efficiency of a communication system while meeting the QoS needs of the users. One of the most prominent antenna techniques that has received a lot of research recently is multiple input multiple output (MIMO) antenna array systems, where both transmitter and receiver are equipped with multiple antenna elements exploiting space (antenna) diversity. Another interesting technology for realizing very high data rates over the rich scattering wireless channel is the VBLAST (Vertical Bell Labs Space Time) architecture. These techniques are thoroughly described, and their BER (Bit Error Rate) versus SNR (Signal-to-Noise Ratio) performance is evaluated by means of computer simulations in various channel environments and using different numbers of transmit antenna elements in the base station. These results of the techniques, along with other characteristics, are compared to examine their performance in various channel environments and investigate which technique is most suitable for each channel environment. Next, we concentrate on round robin packet scheduling. A Packet Scheduler (PS) is aiming to effectively allocate radio resources to users in different channel conditions. The objectives are to maximize spectral efficiency and to provide fairness among users. We investigate the performance of various schemes based on the round robin scheme (RRS) and we propose some new algorithms. Computer simulation are conducted to compare the different scheduling schemes in terms of cell throughputs and outage capacities. The degree of fairness (in terms of time delay and data rates) among the users for these schemes is also investigated. Finally, we focus on Proportional Fair (PF) scheduling. New algorithms using MIMO antennas and VBLAST architecture are proposed to improve the performance of the PF scheme. The system efficiency (in terms of cell throughput) and the QoS (in terms of time delay and data rates) achieved by these schemes are investigated through computer simulations. The main objective of this work is to investigate the interplay of spatial multiplexing techniques (MIMO arrays and VBLAST architecture) with packet scheduling schemes, as well as the tradeoffs between the QoS provided to the end user and the achievable network throughput.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available