MobiSteer: using steerable beam directional antenna for vehicular network access
Proceedings of the 5th international conference on Mobile systems, applications and services
Experimental characterization of sectorized antennas in dense 802.11 wireless mesh networks
Proceedings of the tenth ACM international symposium on Mobile ad hoc networking and computing
Interference alignment and cancellation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
DIRC: increasing indoor wireless capacity using directional antennas
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
SAM: enabling practical spatial multiple access in wireless LAN
Proceedings of the 15th annual international conference on Mobile computing and networking
On the trade-off between feedback and capacity in measured MU-MIMO channels
IEEE Transactions on Wireless Communications
On the effectiveness of switched beam antennas in indoor environments
PAM'08 Proceedings of the 9th international conference on Passive and active network measurement
Employing the one-sender-multiple-receiver technique in wireless LANs
INFOCOM'10 Proceedings of the 29th conference on Information communications
Zero-Forcing Precoding and Generalized Inverses
IEEE Transactions on Signal Processing
On the achievable throughput of a multiantenna Gaussian broadcast channel
IEEE Transactions on Information Theory
The Capacity Region of the Gaussian Multiple-Input Multiple-Output Broadcast Channel
IEEE Transactions on Information Theory
On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming
IEEE Journal on Selected Areas in Communications
WARPlab: a flexible framework for rapid physical layer design
Proceedings of the 2010 ACM workshop on Wireless of the students, by the students, for the students
Random access heterogeneous MIMO networks
Proceedings of the ACM SIGCOMM 2011 conference
Clearing the RF smog: making 802.11n robust to cross-technology interference
Proceedings of the ACM SIGCOMM 2011 conference
Beamforming on mobile devices: a first study
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
Towards fine-grained radio-based indoor location
Proceedings of the Twelfth Workshop on Mobile Computing Systems & Applications
A light-weight wireless handshake
ACM SIGCOMM Computer Communication Review
JMB: scaling wireless capacity with user demands
Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication
Rate adaptation for 802.11 multiuser mimo networks
Proceedings of the 18th annual international conference on Mobile computing and networking
Achieving high data rates in a distributed MIMO system
Proceedings of the 18th annual international conference on Mobile computing and networking
Argos: practical many-antenna base stations
Proceedings of the 18th annual international conference on Mobile computing and networking
MIDU: enabling MIMO full duplex
Proceedings of the 18th annual international conference on Mobile computing and networking
JMB: scaling wireless capacity with user demands
ACM SIGCOMM Computer Communication Review - Special october issue SIGCOMM '12
ArrayTrack: a fine-grained indoor location system
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
Practical performance of MU-MIMO precoding in many-antenna base stations
Proceeding of the 2013 workshop on Cellular networks: operations, challenges, and future design
Bringing cross-layer MIMO to today's wireless LANs
Proceedings of the ACM SIGCOMM 2013 conference on SIGCOMM
SecureArray: improving wifi security with fine-grained physical-layer information
Proceedings of the 19th annual international conference on Mobile computing & networking
NEMOx: scalable network MIMO for wireless networks
Proceedings of the 19th annual international conference on Mobile computing & networking
Employing the one-sender-multiple-receiver technique in wireless LANs
IEEE/ACM Transactions on Networking (TON)
ADAM: an adaptive beamforming system for multicasting in wireless LANs
IEEE/ACM Transactions on Networking (TON)
AirSync: enabling distributed multiuser MIMO with full spatial multiplexing
IEEE/ACM Transactions on Networking (TON)
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Multi-User MIMO promises to increase the spectral efficiency of next generation wireless systems and is currently being incorporated in future industry standards. Although a significant amount of research has focused on theoretical capacity analysis, little is known about the performance of such systems in practice. In this paper, we present the design and implementation of the first multi-user beamforming system and experimental framework for wireless LANs. Using extensive measurements in an indoor environment, we evaluate the impact of receiver separation distance, outdated channel information due to mobility and environmental variation, and the potential for increasing spatial reuse. For the measured indoor environment, our results reveal that two receivers achieve close to maximum performance with a minimum separation distance of a quarter of a wavelength. We also show that the required channel information update rate is dependent on environmental variation and user mobility as well as a per-link SNR requirement. Assuming that a link can tolerate an SNR decrease of 3 dB, the required channel update rate is equal to 100 and 10 ms for non-mobile receivers and mobile receivers with a pedestrian speed of 3 mph respectively. Our results also show that spatial reuse can be increased by efficiently eliminating interference at any desired location; however, this may come at the expense of a significant drop in the quality of the served users.