A low complexity user grouping based multiuser MISO downlink precoder
2011 (English)Conference paper (Refereed)
We consider low complexity precoding for the Multiple Input Single Output (MISO)Gaussian Broadcast channel with $N_t$ antennas at the base station and $N_u$ singleantenna users in the downlink. Theoretical studies have suggested high throughputcommunication with increasing spatial dimensions i.e., $\min(N_t,N_u)$.Nevertheless, most modern communication standards are unable to exploitthe spatial dimension fully, since they are restricted to orthogonal communicationtechniques like TDMA/FDMA (Time/Frequency Division Multiplexed Access) which areknown to be sub-optimal.This restriction is mostly due to the prohibitive complexity of optimal/near-optimalprecoding schemes.On the other hand low complexity techniques like Zero Forcing (ZF) and MMSE have poor sum rate performance.In this paper, we propose a novel low-complexity user grouping based precoding scheme whichschedules all users on the same time-frequency resource (i.e., optimal utilization of resources).The proposed precoder is analytically shown to achieve a sum rate performance significantly better than the ZF precoderat similar complexity.Through simulations, it is also observed to achieve a significant fractionof the sum rate achieved by the optimal schemes.
Place, publisher, year, edition, pages
IEEE , 2011. 1-6 p.
, Globecom. IEEE Conference and Exhibition, ISSN 1930-529X
low complexity, precoding, multiuser, Gaussian Broadcast
IdentifiersURN: urn:nbn:se:liu:diva-70205DOI: 10.1109/GLOCOM.2011.6133649ScopusID: 2-s2.0-84857230960ISBN: 978-1-4244-9267-1 (online)ISBN: 978-1-4244-9266-4 (print)OAI: oai:DiVA.org:liu-70205DiVA: diva2:436786
54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011; Houston, TX; United States, 5-9 Dec. 2011
©2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Saif Khan Mohammed and Erik G. Larsson, A low complexity user grouping based multiuser MISO downlink precoder, 2011, accepted for IEEE GLOBECOM 20112011-08-242011-08-242016-08-31Bibliographically approved