Efficient MU-MIMO via Switched-beam Antennas
Efficient MU-MIMO via Switched-beam Antennas
复制标题
通过波束切换天线实现高效 MU-MIMO
DOI：
10.1145/3084041.3084051
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
K. Psounis
中科院分区：
文献类型：
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作者：
Yonglong Zhang;K. Psounis
对无线带宽的需求正在上升到前所未有的水平。业界已经做出回应，在最新的WiFi和LTE标准中包括先进的PHY技术，最著名的是多用户（MU）MIMO。然而，尽管理论上承诺大的复用增益，但实际上由于收集信道状态信息的大开销和条件不太好的信道矩阵的组合，速率增益是适度的。在本文中，我们建议用廉价的切换波束天线来代替全向天线，以产生用于MU-MIMO目的的良好条件的信道矩阵，并且开销非常低。值得注意的是，软件定义无线电和商用WiFi芯片组的实验结果表明，当使用适当的天线模式时，这导致室内环境中平均吞吐量提高3.5倍至5倍。更重要的是，我们的向后兼容协议扩展加上一个有效的算法来选择合适的天线模式，实现几乎为零的开销上述增益。
The demand for wireless bandwidth is rising to unprecedented levels. The industry has responded with the inclusion of advanced PHY techniques, most notably multi-user (MU) MIMO, in the most recent WiFi and LTE standards. However, despite the theoretical promise for large multiplexing gains, in practice the rate gains are modest due to a combination of large overhead to collect channel state information and not-so-well-conditioned channel matrices. In this paper we propose to replace omni-directional antennas with inexpensive switched-beam antennas to produce well-conditioned channel matrices for MU-MIMO purposes with very low overhead. Remarkably, experimental results with both software defined radios and commercial WiFi chipsets show that, when appropriate antenna modes are used, this leads to a 3.5x-5x average throughput improvement in indoor environments. What is more, our backward compatible protocol extension coupled with an efficient algorithm to select appropriate antenna modes, achieve the aforementioned gains with almost zero overhead.