MIMO systems for futur high data rate wireless underground mines communications

采矿业中现代化的矿产资源开采需要可靠和现代化的通信系统，以继续提高工人的安全性，同时降低运营成本。这些通信系统必须能够同时传输语音、视频监控、采矿设备的远程操作、数据、无线传感器网络、地理定位以及对整个矿山的人员和资产的跟踪。事实上，由于地质构造复杂、矿井拓扑不对称、矿井结构不均匀、地形复杂等因素，地面无线通信系统无法直接应用于地下矿井。为了提高系统在复杂环境下的性能，多输入多输出MIMO系统的优点是提高多媒体和多速率业务下系统容量的关键。MIMO系统的一个关键特性是能够将多径传播（传统上是无线传输的一个陷阱）转化为用户的利益。此外，毫米波MIMO技术是一个非常有前途的候选技术。随着5-7 GHz的巨大频谱在全球范围内被分配为非授权频段，60 GHz频率范围对于未来的室内联网已经变得有吸引力

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