University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Geosphere: Consistently turning MIMO capacity into throughput

Nikitopoulos, K, Zhou, J, Congdon, B and Jamieson, K (2014) Geosphere: Consistently turning MIMO capacity into throughput SIGCOMM 2014 - Proceedings of the 2014 ACM Conference on Special Interest Group on Data Communication. pp. 631-642.

Full text not available from this repository.

Abstract

This paper presents the design and implementation of Geosphere, a physical- and link-layer design for access point-based MIMO wireless networks that consistently improves network throughput. To send multiple streams of data in a MIMO system, prior designs rely on a technique called zero-forcing, a way of "nulling" the interference between data streams by mathematically inverting the wireless channel matrix. In general, zero-forcing is highly effective, significantly improving throughput. But in certain physical situations, the MIMO channel matrix can become "poorly conditioned," harming performance. With these situations in mind, Geosphere uses sphere decoding, a more computationally demanding technique that can achieve higher throughput in such channels. To overcome the sphere decoder's computational complexity when sending dense wireless constellations at a high rate, Geosphere introduces search and pruning techniques that incorporate novel geometric reasoning about the wireless constellation. These techniques reduce computational complexity of 256-QAM systems by almost one order of magnitude, bringing computational demands in line with current 16- and 64-QAM systems already realized in ASIC. Geosphere thus makes the sphere decoder practical for the first time in a 4 x 4 MIMO, 256-QAM system. Results from our WARP testbed show that Geosphere achieves throughput gains over multi-user MIMO of 2x in 4 x 4 systems and 47% in 2 x 2 MIMO systems. © 2014 ACM.

Item Type: Article
Authors :
NameEmailORCID
Nikitopoulos, Kk.nikitopoulos@surrey.ac.ukUNSPECIFIED
Zhou, JUNSPECIFIEDUNSPECIFIED
Congdon, BUNSPECIFIEDUNSPECIFIED
Jamieson, KUNSPECIFIEDUNSPECIFIED
Date : 1 January 2014
Identification Number : 10.1145/2619239.2626301
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:28
Last Modified : 17 May 2017 15:11
URI: http://epubs.surrey.ac.uk/id/eprint/839315

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800