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On Performance of Adaptive Modulation in MIMO Systems Using Orthogonal Space-Time Block Codes
KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture, Communication Systems, CoS.
KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture, Communication Systems, CoS.
2009 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 58, no 8, 4238-4247 p.Article in journal (Refereed) Published
Abstract [en]

We provide a systematic study of adaptive modulation schemes in multiple-input multiple-output (MIMO)orthogonal space-time block codes (OSTBC) systems. Closed-form expressions are obtained to evaluate systemperformance, e.g., average spectral efficiency, bit-error-ratio (BER), and outage probability. Provided the closedformexpressions, the optimal SNR thresholds that yield the maximal average spectral efficiency can be solved. Inorder to reduce complexity of the optimal algorithm, an original method which can achieve approximately the sameperformance as the optimal one is proposed. Furthermore, we apply these methods in a more practical situation,where channel estimation is imperfect, and examine how the performance is affected due to channel estimationerrors.

Place, publisher, year, edition, pages
2009. Vol. 58, no 8, 4238-4247 p.
Keyword [en]
Adaptive modulation; bit error ratio (BER) constraint; imperfect channel state information (CSI); multiple input-multiple output (MIMO); orthogonal space-time block code (OSTBC)
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-9798DOI: 10.1109/TVT.2009.2022475ISI: 000270547800035Scopus ID: 2-s2.0-70350214277OAI: oai:DiVA.org:kth-9798DiVA: diva2:133051
Note
QC 20100812. Uppdaterad från submitted till published (20100812).Available from: 2009-01-07 Created: 2009-01-07 Last updated: 2010-08-12Bibliographically approved
In thesis
1. Adaptive MIMO Systems with Channel State Information at Transmitter
Open this publication in new window or tab >>Adaptive MIMO Systems with Channel State Information at Transmitter
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

 This dissertation presents adaptation techniques that can achieve high spectral efficiency for single user multiple-input multiple-output (MIMO) systems. Two types of adaptation techniques, adaptive modulation and adaptive powe allocation, are employed to adapt the rate and the transmit power to fading channels. We start by investigating the adaptive modulation subject to a certain bit-error-ratio (BER) constraint, either instantaneous BER constraint or average BER constraint. The resulting average spectral efficiencies are obtained in closed-form expressions. It turns out that, by employing the average BER constraint, we can achieve the optimal average spectra efficiency at the cost of prohibitive computational complexity. On the other hand, instantaneous BER constraint leads to inferior performance with little computational complexity. In order to achieve comparable performance to the average BER constraint with limited complexity, a non-linear optimization method is proposed. To further enhance the average spectra efficiency, adaptive power allocation schemes are considered to adjust the transmit power across the temporal domain or the spatial domain, depending on the specific situation. Provided the closed-form expressions of the average spectral efficiency, the optimal MIMO coding scheme that offers the highest average spectral efficiency under the same circumstances can be identified. As we take into account the effect of imperfect channel estimation, the adaptation techniques are revised to tolerate interference introduced by the channel estimation errors. As a result, the degradation with respect to the average spectral efficiency is in proportion to signal-to-noise ratio (SNR). In order to facilitate fast development and verification of the adaptation schemes proposed for various MIMO systems, a reconfigurable Link Layer Simulator (LiLaS) which accommodates a variety of wireless/wireline applications is designed in the environment of MATLAB/OCTAVE. The idea of the simulator is originated from Software Defined Radio (SDR) and evolved to suit Cognitive Radio (CR) applications. For the convenience of modification and reconfiguration, LiLaS is functionally divided into generic blocks and all blocks are parameterized.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xvii, 79 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; 0804
Keyword
adaptive modulation, adaptive power allocation, average spectral efficiency, MIMO, BER.
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-9777 (URN)978-91-7415-188-6 (ISBN)
Public defence
2009-01-30, Sal E, Forum IT, Kista, 14:00 (English)
Opponent
Supervisors
Note
QC 20100812Available from: 2009-01-07 Created: 2008-12-13 Last updated: 2010-08-12Bibliographically approved

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