MIMO for Millimeter-Wave Wireless Communications: Beamforming, Spatial Multiplexing, or Both?
MIMO for Millimeter-Wave Wireless Communications: Beamforming, Spatial Multiplexing, or Both?
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DOI：
10.1109/mcom.2014.6979962
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发表时间：
2014-12-01
影响因子：
11.2
通讯作者：
Rangan, Sundeep
中科院分区：
文献类型：
--
作者：
Sun, Shu;Rappaport, Theodore S.;Rangan, Sundeep
使用毫米波频率进行无线通信提供了比以前更大的信道带宽，同时允许在用户设备、基站和接入点使用数十甚至数百个天线元件。到目前为止，MIMO技术，如空间复用、波束成形和分集，已经广泛应用于低频系统，如IEEE 802.11n/ac（无线局域网）和3GPP LTE 4G手机标准。考虑到与毫米波相关的微小波长，再加上所使用的传播和天线的差异，目前尚不清楚多流空间复用在多大程度上适合未来的毫米波移动通信。本教程探讨了为毫米波频率选择最佳通信方法所涉及的基本问题，并提供了基于毫米波传播环境的早期知识的见解，挑战和每种MIMO技术的适当使用。
The use of mmWave frequencies for wireless communications offers channel bandwidths far greater than previously available, while enabling dozens or even hundreds of antenna elements to be used at the user equipment, base stations, and access points. To date, MIMO techniques, such as spatial multiplexing, beamforming, and diversity, have been widely deployed in lower-frequency systems such as IEEE 802.11n/ac (wireless local area networks) and 3GPP LTE 4G cellphone standards. Given the tiny wavelengths associated with mmWave, coupled with differences in the propagation and antennas used, it is unclear how well spatial multiplexing with multiple streams will be suited to future mmWave mobile communications. This tutorial explores the fundamental issues involved in selecting the best communications approaches for mmWave frequencies, and provides insights, challenges, and appropriate uses of each MIMO technique based on early knowledge of the mmWave propagation environment.