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On Spectral Efficiency of Low-Complexity Adaptive MIMO Systems in Rayleigh Fading Channel
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
2009 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 8, no 9, 4369-4374 p.Article in journal (Refereed) Published
Abstract [en]

Adaptive MQAM modulation is used to maximize spectral efficiency of Multiple-Input Multiple-Output (MIMO) systems while keeping bit error rate (BER) under a target level. Closed-form expressions of the average spectral efficiency, coined as discrete-rate spectral efficiency (DRSE), are derived for adaptive modulation MIMO systems using different algorithms. To further enhance the spectral efficiency, a low complexity adaptation scheme is suggested to switch across different algorithms based on the DRSE. In the current letter, we investigate the adaptation scheme that switches between Orthogonal Space-Time Block Codes (OSTBC) and spatial multiplexing with zero-forcing (ZF) detection for MIMO systems with two transmit antennas. Two types of operating environment are considered: flat Rayleigh fading channel without spatial correlation and spatially correlated Rayleigh fading channel with transmit correlation.

Place, publisher, year, edition, pages
2009. Vol. 8, no 9, 4369-4374 p.
Keyword [en]
OSTBC, ZF, adaptive modulation, average spectral efficiency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Computer and Information Science
Identifiers
URN: urn:nbn:se:kth:diva-32450DOI: 10.1109/TWC.2009.070167ISI: 000269621700001Scopus ID: 2-s2.0-70350309510OAI: oai:DiVA.org:kth-32450DiVA: diva2:410804
Note
QC 20110415Available from: 2011-04-15 Created: 2011-04-14 Last updated: 2017-12-11Bibliographically approved

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