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Outage Behavior of MIMO Channels with Partial Feedback and Minimum Multiplexing Gains
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 IEEE International Symposium on Information Theory, Vols 1-6, Proceedings, New York, USA: IEEE , 2006, 2694-2698 p.Conference paper (Refereed)
Abstract [en]

The diversity-multiplexing (D-M) tradeoff over a multiantenna channel with resolution-constrained feedback is characterized. The concept of minimum guaranteed multiplexing gain in the forward link is introduced and shown to significantly influence the optimal D-M tradeoff. It is demonstrated that rate adaptation is important in obtaining a high diversity gain even at high rates. The class of extended approximately universal codes is shown to be tradeoff optimal. With codes from this class, the optimal D-M tradeoff is achievable by the combination of a feedback-dependent power controller and only two codebooks. Two novel lower bounds to the optimal D-M tradeoff based on Gaussian coding arguments are presented. These bounds are only asymptotically tight, but can quickly approach the optimal tradeoff even with moderate codeword lengths.

Place, publisher, year, edition, pages
New York, USA: IEEE , 2006. 2694-2698 p.
Keyword [en]
Feedback control, Gain control, MIMO systems, Multiplexing, Power control
National Category
URN: urn:nbn:se:kth:diva-5715DOI: 10.1109/ISIT.2006.262143ISI: 000245289705054ScopusID: 2-s2.0-39049139421ISBN: 978-1-4244-0505-3OAI: diva2:10168
IEEE International Symposium on Information Theory, Seattle, WA, JUL 09-14, 2006
QC 20101117. Uppdaterad från In press till Published (20101117)Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2011-12-22Bibliographically 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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