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You searched for +publisher:"University of Texas – Austin" +contributor:("Debbah, Merouane"). One record found.

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1. Akoum, Salam Walid. Limited feedback MIMO for interference limited networks.

Degree: Electrical and Computer Engineering, 2012, University of Texas – Austin

Managing interference is the main technical challenge in wireless networks. Multiple input multiple output (MIMO) methods are key components to overcome the interference bottleneck and deliver higher data rates. The most efficient MIMO techniques require channel state information (CSI). In practice, this information is inaccurate due to errors in CSI acquisition, as well as mobility and delay. CSI inaccuracy reduces the performance gains provided by MIMO. When compounded with uncoordinated intercell interference, the degradation in MIMO performance is accentuated. This dissertation investigates the impact of CSI inaccuracy on the performance of increasingly complex interference limited networks, starting with a single interferer scenario, continuing to a heterogeneous network with a femtocell overlay, and finishing with a clustered multicell coordination model for randomly deployed transmitting nodes. First, this dissertation analyzes limited feedback beamforming and precoded spatial multiplexing over temporally correlated channels. Assuming uncoordinated interference from one dominant interferer, using Markov chain convergence theory, the gain in the average successful throughput at the mobile user is shown to decrease exponentially with the feedback delay. The decay rate is amplified when the user is interference limited. Interference cancellation methods at the receiver are shown to mitigate the effect of interference. This work motivates the need for practical MIMO designs to overcome the adverse effects of interference. Second, limited feedback beamforming is analyzed on the downlink of a more realistic heterogeneous cellular network. Future generation cellular networks are expected to be heterogeneous, consisting of a mixture of macro base stations and low power nodes, to support the increasing user traffic capacity and reliability demand. Interference in heterogeneous environments cannot be coordinated using traditional interference mitigation techniques due to the on demand and random deployment of low power nodes such as femtocells. Using tools from stochastic geometry, the outage and average achievable rate of limited feedback MIMO is computed with same-tier and cross-tier interference, and feedback delay. A hybrid fixed and random network deployment model is used to analyze the performance in a fixed cell of interest. The maximum density of transmitting femtocells is derived as a function of the feedback rate and delay. The detrimental effect of same-tier interference is quantified, as the mobile user moves from the cell-center to the cell-edge. The third part of this dissertation considers limited coordination between randomly deployed transmitters. Building on the established degrading effect of uncoordinated interference on practical MIMO methods, and the analytical tractability of random deployment models, interference coordination is analyzed. Using multiple antennas at the transmitter for interference nulling in ad hoc networks is first shown to achieve MIMO gains using single antenna… Advisors/Committee Members: Heath, Robert W., Ph. D. (advisor), Andrews, Jeffrey G. (committee member), Sanghavi, Sujay (committee member), Debbah, Merouane (committee member), Vikalo, Haris (committee member), Kountouris, Marios (committee member).

Subjects/Keywords: Multiple antennas; Interference management; Stochastic geometry; Multicell coordination; Markov chains; Interference nulling; Cellular systems; Ad hoc networks; Limited feedback

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APA (6th Edition):

Akoum, S. W. (2012). Limited feedback MIMO for interference limited networks. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-12-6651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Akoum, Salam Walid. “Limited feedback MIMO for interference limited networks.” 2012. Thesis, University of Texas – Austin. Accessed March 25, 2019. http://hdl.handle.net/2152/ETD-UT-2012-12-6651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Akoum, Salam Walid. “Limited feedback MIMO for interference limited networks.” 2012. Web. 25 Mar 2019.

Vancouver:

Akoum SW. Limited feedback MIMO for interference limited networks. [Internet] [Thesis]. University of Texas – Austin; 2012. [cited 2019 Mar 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-12-6651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Akoum SW. Limited feedback MIMO for interference limited networks. [Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-12-6651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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