User Scheduling for Cooperative Base Station Transmission Exploiting Channel Asymmetry
2013 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 61, no 4, 1426-1435 p.Article in journal (Refereed) Published
We study low-signalling overhead scheduling for downlink coordinated multi-point (CoMP) transmission with multi-antenna base stations (BSs) and single-antenna users. By exploiting the asymmetric channel feature, i.e., the pathloss differences towards different BSs, we derive a metric to judge orthogonality among users only using their average channel gains, based on which we propose a semi-orthogonal scheduler that can be applied in a two-stage transmission strategy. Simulation results demonstrate that the proposed scheduler performs close to the semi-orthogonal scheduler with full channel information, especially when each BS is with more antennas and the cell-edge region is large. Compared with other overhead reduction strategies, the proposed scheduler requires much less training overhead to achieve the same cell-average data rate.
Place, publisher, year, edition, pages
2013. Vol. 61, no 4, 1426-1435 p.
Coordinated multi-point (CoMP), user scheduling, low overhead, channel asymmetry
IdentifiersURN: urn:nbn:se:kth:diva-124059DOI: 10.1109/TCOMM.2013.020413.110188ISI: 000318998100021ScopusID: 2-s2.0-84877922904OAI: oai:DiVA.org:kth-124059DiVA: diva2:633094
QC 201306262013-06-262013-06-252013-06-26Bibliographically approved