JMB: scaling wireless capacity with user demands
JMB: scaling wireless capacity with user demands
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DOI：
10.1145/2342356.2342401
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发表时间：
2012-08
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影响因子：
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通讯作者：
Hariharan Rahul;Swarun Kumar;D. Katabi
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文献类型：
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作者：
Hariharan Rahul;Swarun Kumar;D. Katabi
我们提出了联合多用户波束成形（JMB），一个系统，使独立的接入点（AP）波束成形他们的信号，并与他们的客户端在同一信道上，如果他们是一个大型MIMO发射机进行通信。JMB背后的关键使能技术是一种新的低开销技术，用于以分布式方式同步多个发射机的相位。该设计允许无线LAN通过在同一信道上不断添加更多AP来扩展其吞吐量。JMB在软件无线电客户端和现成的802.11n卡上进行了实施和测试，并在类似会议室的密集拥塞部署中进行了评估。10-AP软件无线电测试平台的结果显示，网络吞吐量线性增加，中值增益为8.1至9.4倍。我们的研究结果还表明，JMB的联合多用户波束成形可以提供吞吐量增益与未经修改的802.11n卡。
We present joint multi-user beamforming (JMB), a system that enables independent access points (APs) to beamform their signals, and communicate with their clients on the same channel as if they were one large MIMO transmitter. The key enabling technology behind JMB is a new low-overhead technique for synchronizing the phase of multiple transmitters in a distributed manner. The design allows a wireless LAN to scale its throughput by continually adding more APs on the same channel. JMB is implemented and tested with both software radio clients and off-the-shelf 802.11n cards, and evaluated in a dense congested deployment resembling a conference room. Results from a 10-AP software-radio testbed show a linear increase in network throughput with a median gain of 8.1 to 9.4x. Our results also demonstrate that JMB's joint multi-user beamforming can provide throughput gains with unmodified 802.11n cards.