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Document Type:Latin Dissertation
Language of Document:English
Record Number:55218
Doc. No:TL25172
Call number:‭MR46084‬
Main Entry:Seyed Mohammad Ali Torabi
Title & Author:Performance analysis of cooperative MIMO networksSeyed Mohammad Ali Torabi
College:Ecole Polytechnique, Montreal (Canada)
Date:2008
Degree:M.Sc.A.
student score:2008
Page No:157
Abstract:Multiple-antenna and cooperative communications are two advanced technologies that have shaped the realm of academic research on wireless communication over the last few years. The main leverage of these technologies is due to exploiting spatial dimension which is easily available. When multi-antenna and distributed communication are combined together, additional leverages may be gained. Practical examples of such combination is MIMO relay channels when the communication between multi-antenna information source and destination is assisted by a (multiple) relay node(s) which is (are) equipped with multiple antennas. The main focus of this thesis is on relay selection and beamforming for two-hop MIMO (parallel or interference) relay channels. We show that two-hop interference cancellation technique outperforms conventional distributed interference cancellation for MIMO multi-hop networks for practical number of relay nodes. In the first part of the thesis, we consider a two-hop MIMO parallel relay channel where a single source-destination pair both equipped with M antennas, communicate via K N-antenna half-duplex amplify-and-forward relays (K, N ≥ M). A multi-user beamforming technique is jointly applied at the source and destination to respectively multiplex and recover the data streams. In order to further exploit the multi-relay diversity, we propose new relay selection criteria based on semi-orthogonality among spatial eigenmode and antenna pairs of the relays. The proposed algorithms have very low complexity, decrease the amount of feedback, and consume less power across the relays compared to previously proposed MIMO relaying strategies. Furthermore, for small to medium number of relay nodes, the proposed algorithms' capacity outperform the other strategies and in the asymptote of large number of relay nodes (K → ∞), the capacity of the proposed algorithms scales as [special characters omitted] log log K. In the second part, we consider two-hop MIMO interference relay networks, where L M-antenna source nodes communicate to L M -antenna destination nodes via K relay nodes each equipped with N antennas. Based on recent advances in characterizing the limits of MIMO X channel and the concept of interference alignment, we treat this network as two cascaded MIMO X networks. By doing so, we decompose the network into L non-interfering MIMO parallel relay channels. The rationale behind this approach can be justified by information theory of MIMO X channels which reveals that they provide higher degrees of freedom than conventional MIMO interference channels. Signaling, interference alignment as well as relay selection will be discussed and simulation results will be presented. Compared to the well-known distributed interference cancellation technique, this approach offers higher capacity at the cost of feeding back channel state information from the relays to the source nodes and more advanced signaling.
Subject:Applied sciences; Electrical engineering; 0544:Electrical engineering
Added Entry:Ecole Polytechnique, Montreal (Canada)