MIMO systems for futur high data rate wireless underground mines communications

采矿工业中矿物资源的现代开采需要可靠的现代通信系统，以继续提高工人的安全，同时降低作业成本。这些通信系统必须能够同时传送声音、视频监视、采矿设备的远程操作、数据、无线传感器网络、地理定位和跟踪整个矿山的人员和资产。实际上，由于地下矿山地质构造复杂、矿山拓扑不对称、矿山结构不均匀、迷宫分布广泛等因素，地面无线通信系统不能直接应用于地下矿山。为了提高系统在复杂环境下的性能，利用多输入多输出MIMO系统的优势是提高多媒体和多速率业务下容量的关键。MIMO系统的一个关键特征是能够将多路径传播（传统上是无线传输的一个缺陷）转化为用户的利益。此外，毫米波的MIMO技术是一个非常有前途的候选技术。随着5-7千兆赫的巨大频谱在全球范围内被分配为未经许可的频段，60千兆赫的频率范围已成为未来室内网络的吸引力

A modern exploitation of mineral resources in the mining industry needs reliable and modern communications systems to continue to improve the worker's safety while reducing the operational costs. These communications systems must be able of transmitting voice, video surveillance, tele-operation of mining equipment, data, wireless sensors networks, geo-location and tracking of personnel and assets throughout the mine simultaneously. In fact, the wireless communication systems used on surface cannot be applied straightaway in underground mines, due to various factors including the complex geological structures, asymmetric mine topology, uneven mine structure, and extensive labyrinths. In order to increase the system performance in those complex environments, the benefits of using Multiple-Input Multiple-Output MIMO system can be the key toward the improvement of the capacity under multimedia and multi-rate services. A key feature of MIMO systems is the ability to turn multipath propagation, traditionally a pitfall of wireless transmission, into a benefit for the user. Moreover, MIMO technology at mm-wave is a very promising candidate. With a huge spectrum of 5-7 GHz allocated as an unlicensed band worldwide, the 60 GHz frequency range has become attractive for future indoor networking