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Diversity-Multiplexing Tradeoff of MIMO Systems with Partial Power Control
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-7926-5081
2006 (English)In: 2006 International Zurich Seminar on Communications: Access - Transmission - Networking, Proceedings, New York, USA: IEEE , 2006, 106-109 p.Conference paper (Refereed)
Abstract [en]

The tradeoff between the diversity and multiplexing gains that can be simultaneously achieved over a slowly fading multiple-antenna channel with partial transmit side information is characterized in a recursive manner. It is assumed that the information rate grows as the long-term average transmit power increases, but does not adapt to the channel state. Partial power control is shown to be instrumental in achieving the optimal tradeoff over such a system. Our results indicate that the diversity gain can be increased considerably even with coarsely quantized channel state information, especially at low multiplexing gains.

Place, publisher, year, edition, pages
New York, USA: IEEE , 2006. 106-109 p.
Keyword [en]
Antennas, Channel capacity, Fading (radio), Gain control, Multiplexing, Power control
National Category
URN: urn:nbn:se:kth:diva-5714DOI: 10.1109/IZS.2006.1649091ISI: 000238975300026ScopusID: 2-s2.0-33845563078ISBN: 1-4244-0091-0OAI: diva2:10167
International Zurich Seminar on Communications, Zurich, SWITZERLAND, FEB 22-24, 2006

QC 20101117

Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2015-09-15Bibliographically approved
In thesis
1. Quantized Feedback for Slow Fading Channels
Open this publication in new window or tab >>Quantized Feedback for Slow Fading Channels
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Two topics in fading channels with a strict delay constraint and a resolution-constrained feedback link are treated in this thesis.

First, a multi-layer variable-rate single-antenna communication system with quantized feedback, where the expected rate is chosen as the performance measure, is studied under both short-term and long-term power constraints. Iterative algorithms exploiting results in the literature of parallel broadcast channels are developed to design the system parameters. A necessary and sufficient condition for single-layer coding to be optimal is derived. In contrast to the ergodic case, it is shown that a few bits of feedback information can improve the expected rate dramatically. The role of multi-layer coding, however, reduces quickly as the resolution of the feedback link increases.

The other part of the thesis deals with partial power control systems utilizing quantized feedback to minimize outage probability, with an emphasis on the diversity-multiplexing tradeoff. An index mapping with circular structure is shown to be optimal and the design is facilitated with a justified Gaussian approximation. The diversity gain as a function of the feedback resolution is analyzed. The results are then extended to characterize the entire diversity-multiplexing tradeoff curve of multiple-antenna channels with resolution-constrained feedback. Adaptive-rate communication is also studied, where the concept of minimum multiplexing gain is introduced. It is shown that the diversity gain of a system increases significantly even with coarsely quantized feedback, especially at low multiplexing gains.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. vi, 21 p.
Trita-EE, ISSN 1653-5146 ; 2006:011
Fading channels, information rates, feedback communications, diversity methods, MIMO systems, power control, adaptive systems, quantization.
National Category
urn:nbn:se:kth:diva-3952 (URN)
2006-05-24, Q2, Osquldas väg 10, KTH, Stockholm, 13:00
QC 20101117Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2010-11-17Bibliographically approved

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