Enabling Techniques for 5G Networks

到2016年，移动的连接速度将增加9倍，智能手机的总流量将比现在增加50倍，移动的视频将增加25倍[思科全球移动的数据流量预测]。为了跟上这种惊人的增长，我们迫切需要早餐。尽管有这一需要，但具有直接实际影响的突破一直很少。90年代末发展起来的MIMO天线系统，带来了重大的改进，并很快在无线产品中找到了自己的道路。在MIMO之后，PI的团队于2006年引入了一个更新的突破，即干扰对齐（IA）。IA已经引起了极大的关注，然而，其实际实施仍然具有挑战性。为了满足未来的需求，需要关注三个相互关联的领域：“传输速率”、“联网”和“安全”。拟议的研究解决这些领域依赖于跨层的战略。“传输速率”和“组网”的问题主要依靠“全双工无线”来解决，而一种称为“基于媒体的调制”的新技术被应用于增加吞吐量和处理信道衰落。全双工无线使用相同的带宽来同时发送和接收。这与功能类似于对讲机的传统半双工系统形成对比。除了使速率加倍之外，全双工还简化了许多网络问题。PI团队引入的基于媒体的调制是基于在不同的通信介质中嵌入部分信息。这种方法显著提高了速率并增强了可靠性。该研究还将提出一种新的物理层安全方法，该方法基于使用无线信道在两个合法方之间建立密钥（一次性密码本）。共享密钥取决于合法方之间的传播环境，并且不可能被猜到。依靠一个跨物理层、网络、射频结构和软件等互补领域的多学科团队，拟议研究的结果预计将对5G系统的开发产生深远影响。

By 2016, mobile connection speeds will increase 9-fold, aggregate smartphone traffic will be 50 times greater than it is today, and mobile video will increase 25-fold [Cisco Global Mobile Data Traffic Forecast]. Breakthroughs are desperately needed to keep up with this phenomenal growth. In spite of this need, breakthroughs with immediate practical implications have been scarce. MIMO antenna systems, developed in late 90's, resulted in a significant improvement and soon found its way in wireless products. After MIMO, a more recent breakthrough, Interference Alignment (IA) was introduced by the PI's team in 2006. IA has attracted significant attention, however, its practical implementation remains challenging. To address the future needs, three interrelated areas need attention: "transmission rate", "networking" and "security". The proposed research addresses these areas relying on a cross layer strategy. The problems of "transmission rate" and "networking" are primarily handled relying on "full-duplex wireless", while a novel technique called "media-based modulation" is applied to increase the throughput and deal with channel fading. Full-duplex wireless uses the same bandwidth to simultaneously transmit and receive. This is in contrast to legacy half-duplex systems which function similar to walkie-talkies. In addition to doubling the rate, full-duplex simplifies many of the networking issues. Media-based modulation, introduced by the PI's team, is based on embedding part of the information in varying the communication medium. This approach significantly increases the rate and enhances the reliability. The research will also address a novel approach for physical layer security based on using a wireless channel to establish a secret key (one-time pad) between two legitimate parties. The shared key depends on the propagation environment between legitimate parties and will be impossible to guess. Relying on a multi-disciplinary team, which spans complementary areas of physical layer, networking, RF structures, and software, the findings of the proposed research are expected to have a profound impact on the development of 5G systems.