Effective Capacity Maximization in Multi-Antenna Channels with Covariance Feedback
2010 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 9, no 10, 2988-2993 p.Article in journal (Refereed) PublishedText
The tradeoff between average transmission rate and average delay is important for the system design of future wireless communication systems. In double-correlated multiple antenna channels, the spatial degrees of freedom allow to optimize the transmit strategy under throughput/delay priority. In this work, we maximize the effective capacity of a MIMO system with covariance feedback. Interestingly, the larger the delay requirement is, the more spatial degrees of freedom are used to avoid low instantaneous transmission rates. This fact is shown analytically by deriving a closed-form expression for the beamforming optimality range as a function of the spatial correlation, the SNR, and the QoS exponent. Numerical simulations illustrate the average effective capacity optimization and confirm the theoretical results.
Place, publisher, year, edition, pages
IEEE Press, 2010. Vol. 9, no 10, 2988-2993 p.
Effective capacity; multi-antenna; convex optimization; channel hardening
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-182701DOI: 10.1109/TWC.2010.080210.091060ISI: 000283436800003ScopusID: 2-s2.0-77957901438OAI: oai:DiVA.org:kth-182701DiVA: diva2:1052187
QC 201612122016-12-052016-02-222016-12-12Bibliographically approved