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SAM: enabling practical spatial multiple access in wireless LAN

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International Conference on Mobile Computing and Networking archive
Proceedings of the 15th annual international conference on Mobile computing and networking table of contents

Beijing, China

SESSION: Communication efficiency table of contents

Pages 49-60

Year of Publication: 2009

ISBN:978-1-60558-702-8

Authors

Kun Tan	Microsoft Research Asia, Beijing, China
He Liu	Microsoft Research Asia and Tsinghua University, Beijing, China
Ji Fang	Microsoft Research Asia and Beijing Jiaotong University, Beijing, China
Wei Wang	Microsoft Research Asia, Beijing, China
Jiansong Zhang	Microsoft Research Asia, Beijing, China
Mi Chen	Microsoft Research Asia and South East University, Beijing, China
Geoffrey M. Voelker	University of California San Diego, La Jolla, CA, USA

Sponsors

SIGMOBILE: ACM Special Interest Group on Mobility of Systems, Users, Data and Computing
ACM: Association for Computing Machinery

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ACM New York, NY, USA

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ABSTRACT

Spatial multiple access holds the promise to boost the capacity of wireless networks when an access point has multiple antennas. Due to the asynchronous and uncontrolled nature of wireless LANs, conventional MIMO technology does not work efficiently when concurrent transmissions from multiple stations are uncoordinated. In this paper, we present the design and implementation of a crosslayer system, called SAM, that addresses the challenges of enabling spatial multiple access for multiple devices in a random access network like WLAN. SAM uses a chain-decoding technique to reliably recover the channel parameters for each device, and iteratively decode concurrent frames with misaligned symbol timings and frequency offsets. We propose a new MAC protocol, called CCMA, to enable concurrent transmissions by different mobile stations while remaining backward compatible with 802.11. Finally, we implement the PHY and MAC layer of SAM using the Sora high-performance software radio platform. Our evaluation results under real wireless conditions show that SAM can improve network uplink throughput by 70% with two antennas over 802.11.

REFERENCES

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