On Performance of Adaptive Modulation in MIMO Systems Using Orthogonal Space-Time Block Codes
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
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.
Adaptive modulation; bit error ratio (BER) constraint; imperfect channel state information (CSI); multiple input-multiple output (MIMO); orthogonal space-time block code (OSTBC)
IdentifiersURN: urn:nbn:se:kth:diva-9798DOI: 10.1109/TVT.2009.2022475ISI: 000270547800035ScopusID: 2-s2.0-70350214277OAI: oai:DiVA.org:kth-9798DiVA: diva2:133051
QC 20100812. Uppdaterad från submitted till published (20100812).2009-01-072009-01-072010-08-12Bibliographically approved