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Title: Precoding designs for multi-user MIMO and multi-cell cooperative systems
Author: Patcharamaneepakorn, Piya
ISNI:       0000 0004 5354 727X
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2014
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In this thesis, linear precoding designs and scheduling algorithms are studied based on the maximum Signal-to-Leakage-plus-Noise Ratio (SLNR) criteria in single-cell Multi-user MIMO (MU-MIMO) systems as well as in multi-cell MIMO cooperative networks. The conventional SLNR precoding scheme is firstly investigated. Analytic expressions of the conventional SLNR-based solution are derived and are shown to be a generalised form of regularised channel inversion techniques. Consequently, equivalence between the SLNR and other regularised channel inversion schemes for the case of single-antenna and multi-antenna receivers can be established. This provides an alternative view of the conventional SLNR precoding design and leads to several useful implications in terms of possible exchange of relevant algorithms and performance analysis among these linear precoding schemes. One of the main issues of the conventional SLNR precoding design for the case that all available eignmodes are not fully transmitted is then addressed. Enhanced leakage-based precoding designs are proposed and are thoroughly studied in single-cell MU-MIMO based on two main approaches, i.e. the receive antenna selection and the enhanced receive subspace estimation. The latter is seen to be superior to the former and, as a result, serves as an underlying technique for subsequent studies. The proposed leakage-based precoding designs with receive subspace estimation techniques are further applied to the transceiver design for achieving the maximum Weighted Sum Rate (WSR) in single-cell MU-MIMO systems. Based on the proposed trallsceiver structure, the problem call be simplified into two different problems, i.e. the power allocation and the data stream selection problems, to which the solutions are separately proposed. The resulting precoding designs are shown to have comparable performance to existing joint Transmit (TX)-Receive (RX) filter designs despite requiring simpler receiver structures. The enhanced leakage-based transceiver designs are also extended from the single-cell MU-MIMO systems to multi-cell coordinated beamforming scenarios. Further, the resulting transceiver designs are applied to the WSR maximisation problem in the multi-cell case by extending the power allocation and the data stream selection approaches as previously studied in the single-cell case to the multi-cell coordinated beamforming systems.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available