SAMU: Design and implementation of selectivity-aware MU-MIMO for wideband WiFi

Yongjiu Du, Ehsan Aryafar, Pengfei Cui, Joseph Camp, Mung Chiang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

In anticipation of the increasing demand of wireless traffic, WiFi standardization efforts have recently focused on two key technologies for capacity improvement: multi-user MIMO and wider bandwidth. However, users experience heterogeneous channel orthogonality characteristics across sub-carriers in the same channel bandwidth, which prevents ideal multi-user gain. Moreover, frequency selectivity increases as bandwidth scales and correspondingly severely deteriorates multi-user MIMO performance. In this work, we consider the frequency selectivity of current and emerging WiFi channel bandwidths to optimize multi-user MIMO by dividing the occupied channel bandwidth into equally-sized sub-channels according to the level of frequency selectivity. In our selectivity-aware multi-user MIMO design, SAMU, each sub-channel is allocated according to the largest bandwidth that can be considered frequency-flat, and an optimal subset of users is chosen to serve in each sub-channel according to spatial orthogonality, achieving a significant performance improvement for all users in the network. Additionally, we propose a selectivity-aware very high throughput (SA-VHT) mode, which is based on and an extension to the existing IEEE 802.11ac standard. Over emulated and real indoor channels, even with minimal mobility, SAMU achieves as much as 80 percent throughput improvement compared to existing multi-user MIMO schemes, which could serve as a lower bound as bandwidth scales.

Original languageEnglish (US)
Title of host publication2015 12th Annual IEEE International Conference on Sensing, Communication, and Networking, SECON 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages229-237
Number of pages9
ISBN (Electronic)9781467373319
DOIs
StatePublished - Nov 25 2015
Event12th Annual IEEE International Conference on Sensing, Communication, and Networking, SECON 2015 - Seattle, United States
Duration: Jun 22 2015Jun 25 2015

Publication series

Name2015 12th Annual IEEE International Conference on Sensing, Communication, and Networking, SECON 2015

Other

Other12th Annual IEEE International Conference on Sensing, Communication, and Networking, SECON 2015
CountryUnited States
CitySeattle
Period6/22/156/25/15

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Instrumentation

Keywords

  • Bandwidth
  • Delays
  • Frequency diversity
  • Frequency measurement
  • MIMO
  • OFDM
  • Throughput

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