Proceedings ArticleDOI
Scaling multi-user MIMO WLANs: The case for concurrent uplink control messages
Oscar Bejarano,Sadia Quadri,Omer Gurewitz,Edward W. Knightly +3 more
- pp 238-246
TLDR
This paper designs, implements, implement, and experimentally evaluates Concurrent Uplink Control Messages (CUiC), a technique to scale the MU-MIMO control information exchange process and improve the efficiency of 802.11ac-based MU- MIMO networks.Abstract:
Downlink Multi-User MIMO (MU-MIMO) enables the simultaneous spatial sharing of the channel by multiple users to achieve a capacity gain over Single-Input Single-Output (SISO) systems. Unfortunately, the overhead required to enable multi-user MIMO is much higher than the overhead required for single-stream systems. Namely, for K users, collection of channel state information requires K transmission exchanges (i.e., O(K)) between the AP and users. Likewise, the MU-MIMO acknowledgement process also requires the same amount of exchanges, thus reducing the performance gains attained via simultaneous downlink transmission. In this paper, we design, implement, and experimentally evaluate Concurrent Uplink Control Messages (CUiC) to scale the MU-MIMO control information exchange process and improve the efficiency of 802.11ac-based MU-MIMO networks. Our key technique is the design of new channel sounding and acknowledgement mechanisms that enable multiple users to transmit their reverse-direction control messages (i.e., beamforming reports and acknowledgments) concurrently to the AP, in O(1) transmission slots. We implement CUiC and perform an extensive set of experiments and demonstrate throughput gains of more than 100% compared to 802.11ac.read more
Citations
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Journal ArticleDOI
Comprehensive Study on MIMO-Related Interference Management in WLANs
TL;DR: This paper investigates the current advances on MIMO-related interference management in both the single collision domain and multiple collision domain through the physical layer and MAC layer mechanism design and provides discussions on important findings and research challenges and potential future research directions.
Journal ArticleDOI
Uplink Access Protocol in IEEE 802.11ac
TL;DR: An access point-controlled MAC protocol (A-MAC) that enables simultaneous transmissions from multiple STAs in uplink and shortens the backoff time by up to 50% for all traffic categories due to concurrent multiple transmissions and thus enhances the battery life of the nodes.
Rate adaptation for 802.11 multiuser mimo networks
Wei-Liang Shen,Yu-Chih Tung,Kuang-Che Lee,Kate Ching-Ju Lin,Shyamnath Gollakota,Dina Katabi,Ming-Syan Chen +6 more
TL;DR: TurboRate as mentioned in this paper is a rate adaptation scheme for multiuser MIMO LANs, where each client can adapt its bit rate on a per-packet basis if each client learns two variables: its SNR when it transmits alone to the access point, and the direction along which its signal is received at the AP.
Patent
Enabling distributed access points on high bandwidth cables for band and antenna splitting
TL;DR: In this paper, a wireless access point includes a central processor subsystem and a plurality of transceiver devices, each of which is connected to the central processor via a respective cable, with each transceiver device associated with traffic to be transmitted and received via the plurality of devices in one or more frequency bands.
Proceedings ArticleDOI
Access Point Controlled MAC (A-MAC) Protocol for Uplink Multi-User Transmission in IEEE 802.11ac
TL;DR: An efficient Access Point controlled MAC protocol that enables concurrent multiple uplink transmissions for different priority traffic classes is proposed that shows that network throughput of A-MAC is 150\% higher than the throughput of single uplink transmission in existing IEEE 802.11ac protocol.
References
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Book
Fundamentals of Wireless Communication
David Tse,Pramod Viswanath +1 more
TL;DR: In this paper, the authors propose a multiuser communication architecture for point-to-point wireless networks with additive Gaussian noise detection and estimation in the context of MIMO networks.
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Taesang Yoo,Andrea Goldsmith +1 more
TL;DR: It is shown that a zero-forcing beamforming (ZFBF) strategy, while generally suboptimal, can achieve the same asymptotic sum capacity as that of DPC, as the number of users goes to infinity.
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David J. Love,Robert W. Heath,Vincent K. N. Lau,David Gesbert,Bhaskar D. Rao,Matthew Andrews +5 more
TL;DR: This tutorial provides a broad look at the field of limited feedback wireless communications, and reviews work in systems using various combinations of single antenna, multiple antenna, narrowband, broadband, single-user, and multiuser technology.
Journal ArticleDOI
Shifting the MIMO Paradigm
TL;DR: Multi-user MIMO (MU-MIMO) networks reveal the unique opportunities arising from a joint optimization of antenna combining techniques with resource allocation protocols, and brings robustness with respect to multipath richness, yielding the diversity and multiplexing gains without the need for multiple antenna user terminals.
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