Graduate School and Research Center In communication systems

Systems and techniques for multicell-MIMO and cooperative relaying in wireless networks

Papadogiannis, Agisilaos

Thesis

      The constantly increasing demand for wireless services, the scarcity of radio spectrum and the characteristics of the global wireless market, necessitate that future wireless systems (Fourth Generation Mobile - 4G) provide higher peak data rates and better QoS, especially for the cell-edge users. Furthermore it is essential that they achieve high spectral efficiencies and they are easily deployed. In order to be able to accomplish these objectives, wireless systems need to incorporate technologies that increase the cell throughput without increasing spectral consumption. A very promising technique that can achieve the aforementioned targets is Multicell Cooperative Processing (MCP) or Multicell-MIMO. MCP has the potential to mitigate Inter-Cell Interference (ICI) and augment data rates without sacrificing additional spectrum but at the cost of some overhead and complexity. According to the concept of clustered MCP proposed in this thesis, Base Stations (BSs) are grouped into cooperation clusters, each of which contains a subset of the network BSs. The BSs of each cluster exchange information and jointly process signals as they form virtual antenna arrays distributed in space. In these systems, each user receives useful signals from several BSs and therefore the notion of a cell transcends the one of the conventional cellular systems. Although Multicell-MIMO is a technique that can help meet a lot of the challenges towards 4G systems, it has some intrinsic drawbacks that need to be addressed in order for it to be brought into practice; this is the main focus of the present thesis. Firstly the problem of how to optimally form BS cooperation clusters of limited size has been investigated. MCP's overheads are proportional to the size of cooperation clusters, therefore this size should be kept limited. The straightforward solution of forcing neighboring BSs to collaborate provides limited gains. In this thesis it is proposed that the BSs which interfere the most with each other should cooperate rather the ones that are in close proximity. This is shown to lead to significant spectral efficiency gains while cluster sizes are kept very small.

Document Hal Bibtex

Type:Thesis
Language:English
City:
Date:
Department:Mobile Communications
Eurecom ref:3045
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Bibtex: @phdthesis{EURECOM+3045, year = {2009}, title = {{S}ystems and techniques for multicell-{MIMO} and cooperative relaying in wireless networks}, author = {{P}apadogiannis, {A}gisilaos}, school = {{T}hesis}, month = {12}, url = {http://www.eurecom.fr/publication/3045} }