Enabling Techniques for 5G Networks

到2016年，移动连接速度将提高9倍，智能手机总流量将是目前的50倍，移动视频将增加25倍[思科全球移动数据流量预测]。为了跟上这一惊人的增长，迫切需要突破。尽管有这种需要，但具有直接实际影响的突破一直很少。S在90年代末开发的多输入多输出天线系统带来了重大改进，并很快在无线产品中找到了自己的道路。在MIMO之后，PI的团队在2006年引入了干扰对齐(IA)，这是一项较新的突破。执行委员会已经引起了极大的关注，但其实际执行仍然具有挑战性。为了满足未来的需求，需要注意三个相互关联的领域：“传输率”、“联网”和“安全”。拟议的研究依赖于跨层战略来解决这些领域。“传输速率”和“组网”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”的新技术被应用来增加吞吐量和应对信道衰落。全双工无线使用相同的带宽来同时发送和接收。这与传统的半双工系统形成了鲜明对比，后者的功能类似于对讲机。除了将速率提高一倍外，全双工还简化了许多网络问题。由PI的团队引入的基于媒体的调制是基于在不同的通信媒体中嵌入部分信息。这种方法显著地提高了速度，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各方之间建立秘密密钥(一次性密钥)。共享密钥取决于合法各方之间的传播环境，因此无法猜测。依托一个跨越物理层、网络、射频结构和软件等互补领域的多学科团队，拟议的研究结果预计将对5G系统的发展产生深远影响。

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.