Future Wireless Networks: Spectral Efficiency, Networking and Security

互联网流量的增长引发了在信息量和数据交换速度方面的许多新的研究挑战。无线作为未来的主导接入技术，对这一发展至关重要。作为回应，无线网络一直在不断发展，以更低的成本支持更高的数据速率和更广的覆盖范围。无线连接的瓶颈是频谱，这是一种稀缺的自然资源，价格过高。例如，2014年1月，加拿大拍卖了68兆赫的特高频频谱(以前用于地面电视广播)。8家加拿大公司赢得了拍卖，总价值为52.7亿美元。问题是，无论成本如何，可用的频谱已经被利用/过度拥挤。需要新的技术来满足使用可用频谱为不断增长的移动通信量提供服务的需求。尽管有这种需要，但具有实际意义的突破一直很少。多输入多输出(MIMO)天线系统是S在90年代末发展起来的，取得了显著的进步，并很快在无线产品中找到了方向。在MIMO之后，PI的团队引入了一个更新的突破-干扰对齐(IA)。然而，IA已经引起了相当大的关注，但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”、“组网”和“安全”。拟议的研究在一个保护伞下处理这三个领域。“传输速率”和“联网”的问题主要依靠“全双工无线”来解决，而一种名为“基于媒体的调制”的新技术被应用来提高频谱效率和应对信道衰落。全双工无线是一个新的引擎，它为一个全新的世界铺平了道路，在提高吞吐量、可靠性、速度和安全性方面有未知的可能性。拟议的研究涵盖了这些领域的一些新应用，从安全到网络管理、干扰抑制和认知传输。研究还包括在协作通信、分布式/协作信令、海量星座使用和网络信息理论方面的新方向。拟议的研究将研究提高点对点频谱效率和可靠性的新技术。它还结合所谓的物联网(IoT)中设想的新兴通信范例，如低延迟、开环传输等，讨论了一些关键问题。为了跟上实施更多小区的成本，作为一种共享资源的机制，人们正在寻求“云无线电接入网络(CRAN)”。拟议的研究将调查CRAN的前程/回程连通性问题。这项拟议的研究结果预计将对未来几代无线网络产生深远影响。**

The growth in Internet traffic has triggered many new research challenges in the volume of information and how fast data must be exchanged.  Wireless, as the dominant access technology of the future, is vital to this development. In response, wireless networks have been evolving to support higher data rates and wider coverage, at a lower cost. The bottleneck in wireless connectivity is the spectrum, a scarce natural resource with an exorbitant price. As an example, in January 2014, an auction for 68 MHz of UHF spectrum (formerly used for terrestrial TV broadcasting) was held in Canada. Eight Canadian companies won the auction, with total value of $5.27bn. The problem is that, regardless of the cost, the available spectrum is already exploited/overcrowded.  New technologies are needed to meet the demands in servicing an ever-escalating amount of mobile traffic using the available spectrum. In spite of this need, breakthroughs with practical implications have been scarce. Multiple-Input Multiple-Output (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. 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 three areas under one umbrella. 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 spectral efficiency and deal with channel fading.  Full-duplex wireless is a new engine, paving the way to a whole new world of unexplored possibilities in improving throughput, reliability, speed and security. The proposed research covers some novel applications in these domains, from security to network management, interference rejection and cognitive transmission.  Research also includes new directions in cooperative communications, distributed/collaborative signaling, use of massive constellations, and network information theory. Proposed research will study new techniques to increase the point-to-point spectral efficiency, and reliability. It also addresses some key issues in conjunction with emerging communications paradigms envisioned in the so-called "Internet of Things" (IoT), such as low delay, open loop transmission.  To keep up with the cost of implementing many more cells, `Cloud Radio Access Networks (CRAN)' is pursued as a mechanism to share resources. Proposed research will investigate the issue of front-haul/back-haul connectivity in CRAN. Findings of the proposed research are expected to have a profound impact on the future generations of wireless networks.**