当前位置: X-MOL 学术IEEE Trans. Mob. Comput. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Analysis of Different Approaches to Distributed Multiuser MIMO in the 802.11ac
IEEE Transactions on Mobile Computing ( IF 7.9 ) Pub Date : 2020-11-01 , DOI: 10.1109/tmc.2019.2931301
Joseph Kampeas , Asaf Cohen , Omer Gurewitz

The 802.11ac is a significant landmark in wireless communications, as it pushes towards new rate limits by utilizing downlink multiuser multiple-input multiple-output (MIMO) beamforming to transmit data to various locations simultaneously. However, successful beamforming relies on intelligent user selection which requires, in turn, extensive overhead of channel calibration between the AP and each of the candidate users. The large overhead involved in the user selection procedure overwhelms the multiuser gain and hinders the utilization of multiuser MIMO. The phenomenon is even more acute when APs handle large groups of mobile users, which frequently associate and disconnect, making the process of acquiring channel state from all users and selecting the appropriate group even harder. Thus, the subtle relation between the achievable rate of a scheduling algorithm and the overhead it requires is significant for the 802.11ac performance analysis. In this paper, we provide a rigorous analysis of distributed algorithms that schedule a group of users for the downlink. In particular, we accommodate common scheduling methods for the 802.11ac protocol and analyze both their achievable rate and their calibration process overhead. Both analysis and extensive simulations depict the superiority of simple threshold-based methods in terms of the throughput.

中文翻译:

802.11ac 中分布式多用户 MIMO 的不同方法分析

802.11ac 是无线通信领域的一个重要里程碑,因为它通过利用下行链路多用户多输入多输出 (MIMO) 波束成形将数据同时传输到不同位置来推动新的速率限制。然而,成功的波束成形依赖于智能用户选择,而这又需要在 AP 和每个候选用户之间进行大量的信道校准开销。用户选择过程中涉及的大量开销压倒了多用户增益并阻碍了多用户 MIMO 的利用。当AP处理大量移动用户时,这种现象更加严重,频繁关联和断开连接,使得从所有用户处获取信道状态并选择合适的组的过程更加困难。因此,调度算法的可实现速率与其所需开销之间的微妙关系对于 802.11ac 性能分析非常重要。在本文中,我们对为下行链路调度一组用户的分布式算法进行了严格的分析。特别是,我们为 802.11ac 协议提供了常见的调度方法,并分析了它们的可实现速率和校准过程开销。分析和广泛的模拟都描述了简单的基于阈值的方法在吞吐量方面的优越性。11ac 协议并分析其可实现的速率和校准过程开销。分析和广泛的模拟都描述了简单的基于阈值的方法在吞吐量方面的优越性。11ac 协议并分析其可实现的速率和校准过程开销。分析和广泛的模拟都描述了简单的基于阈值的方法在吞吐量方面的优越性。
更新日期:2020-11-01
down
wechat
bug