Browse

DiFuse: distributed frequency domain user selection for multi-user MIMO networks

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors
Lee, Kyu-haeng; Yoo, Joon; Kim, Chong-kwon
Issue Date
2016-08-08
Publisher
SPRINGER
Citation
WIRELESS NETWORKS, pp. 1-18
Keywords
MU-MIMOUser selectionScalabilityCSI feedback overhead
Abstract
Optimal user selection is important in increasing the capacity of Multi-User Multi-Input Multi-Output Wi-Fi networks, yet it faces a significant challenge; the multi-user diversity gain can be overwhelmed by the formidable Channel State Information (CSI) acquisition overhead. To lessen the overhead, existing schemes adopt the greedy user selection which generally takes the projected norm as the user selection metric, since it considers both the channel power gain and the orthogonality. However, the projected norm suffers from occasional poor user selection, since it does not take the optimal sum capacity gain into account. This paper proposes a new distributed user selection protocol called DiFuse. To employ the sum capacity gain as the user selection metric in DiFuse, each user cleverly computes its own estimated capacity gain by overhearing the CSI feedback from others. The users then simultaneously transmit their feedbacks at the frequency domain via the distributed feedback contention, which effectively reduces the feedback overhead. Then the AP collectively utilizes them for user selection that achieves the maximum positive increment to the sum capacity gain. We implemented the prototype of DiFuse on the USRP N210, and evaluated its performance via both testbed experiments and trace-driven emulations. The results showed that DiFuse outperforms the throughput of the existing scheme called OPUS by 1.8x on average, while maintaining better fairness.
ISSN
1022-0038
Language
English
URI
https://hdl.handle.net/10371/116894
DOI
https://doi.org/10.1007/s11276-016-1328-6
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Computer Science and Engineering (컴퓨터공학부)Journal Papers (저널논문_컴퓨터공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse