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Performance Optimization of MIMO Systems with Partial Channel State Information

Abstract : Multiple-input multiple-output (MIMO) wireless communication systems have the potential to offer high data rates as well as link reliability. The feasibility of these systems in future mobile communication standards depends on the ability to provide high rates with a reduced amount of channel state information at the transmitter (CSIT), due to limited resource availability on the feedback link. This thesis addresses the problem of optimizing MIMO systems with partial CSIT. On the one hand, we provide methods for obtaining CSIT. On the other hand, we propose techniques to exploit the available sources of CSIT to optimize the system performance. In the first part, point-to-point MIMO channels are considered for the purpose of error rate minimization. Linear precoding techniques are proposed to enhance the performance of space-time coded (STC) MIMO systems, by appropriately combining information on the channel mean and covariance. In the second part of this thesis, we focus on sum-rate performance optimization in MIMO broadcast channels with limited feedback. Low-complexity cross-layer approaches are proposed for systems with joint linear beamforming and multiuser scheduling, optimizing the following parts in the MIMO communications system: linear beamforming techniques, scheduling algorithms, feedback strategies and feedback quantization techniques. A design framework for channel quality information (CQI) feedback design is proposed, based on an estimate on each user's signal-to-interference-plus-noise ratio (SINR). As we show, the system performance can be enhanced by using simple channel quantization strategies combined with optimized linear beamforming techniques.
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Submitted on : Thursday, August 13, 2009 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:05 AM
Long-term archiving on: : Sunday, November 27, 2016 - 2:37:31 AM


  • HAL Id : pastel-00003718, version 1


Ruben de Francisco Martin. Performance Optimization of MIMO Systems with Partial Channel State Information. domain_other. Télécom ParisTech, 2008. English. ⟨pastel-00003718⟩



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