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Partial Power Control for Slowly Fading MIMO Channels
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: Proceedings of 2006 IEEE International Conference on Communications, New York: IEEE , 2006, 1362-1367 p.Conference paper, Published paper (Refereed)
Abstract [en]

Transmit power control to minimize the outage probability over a slowly fading multiple-antenna channel utilizing partial channel state information at the transmitter is studied. The optimal power quantizer is shown to have a "circular" structure. The design problem is then explicitly formulated and numerically solved based on a Gaussian approximation. Asymptotic behavior of the outage probability achieved with a finite-size power codebook is investigated. It is shown that the diversity gain of such a system is a K-order polynomial of the product of the number of transmit and receive antennas, where K is the size of the power codebook. The interesting concept of power-control diversity is discussed.

Place, publisher, year, edition, pages
New York: IEEE , 2006. 1362-1367 p.
Series
IEEE International Conference on Communications, ISSN 0536-1486 ; 3
Keyword [en]
Asymptotic analysis, Gaussian distribution, MIMO systems, Multi agent systems, Power control
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-5713DOI: 10.1109/ICC.2006.254938ISI: 000287032701078Scopus ID: 2-s2.0-42549162456ISBN: 978-1-4244-0354-7 (print)OAI: oai:DiVA.org:kth-5713DiVA: diva2:10166
Conference
2006 IEEE International Conference on Communications, ICC 2006; Istanbul; 11 July 2006 through 15 July 2006
Note
QC 20101117Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2011-12-19Bibliographically 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.
Series
Trita-EE, ISSN 1653-5146 ; 2006:011
Keyword
Fading channels, information rates, feedback communications, diversity methods, MIMO systems, power control, adaptive systems, quantization.
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-3952 (URN)
Presentation
2006-05-24, Q2, Osquldas väg 10, KTH, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101117Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2010-11-17Bibliographically approved

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Skoglund, Mikael

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