Exploiting Temporal Channel Correlation in Opportunistic SD-OFDMA
2006 (English)In: 2006 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-12, IEEE , 2006, 5307-5312 p.Conference paper (Refereed)
In opportunistic SDMA, the base station forms several random beams simultaneously and relies on fast but limited feedback for scheduling users on the beams. In this paper, opportunistic SDMA is applied to an OFDMA downlink by having independent beamformers run in parallel on different frequency bands (SD-OFDMA). A method for improving the performance of completely random beamforming is proposed and evaluated. It exploits the temporal channel correlation and the partial channel state information available at the transmitter to keep "successful" beams over longer periods of time than the default block duration. Extensive simulation results show a significant improvement in cell throughput compared to a completely random scheme. The results also show that in order to gain more from the multiple simultaneous beams than what is lost in additional interference, the system load must be high.
Place, publisher, year, edition, pages
IEEE , 2006. 5307-5312 p.
, IEEE International Conference on Communications, ISSN 1550-3607
Base stations, Channel state information, Correlation methods, Feedback, Frequency bands, Scheduling
IdentifiersURN: urn:nbn:se:kth:diva-33494DOI: 10.1109/ICC.2006.255504ISI: 000287032705074ScopusID: 2-s2.0-42549156754ISBN: 978-1-4244-0354-7OAI: oai:DiVA.org:kth-33494DiVA: diva2:415601
IEEE International Conference on Communications (ICC 2006) Location: Istanbul, TURKEY Date: JUN 11-15, 2006
QC 201105092011-05-092011-05-092012-01-23Bibliographically approved