Design, Analysis, and Optimization of Energy-Efficient and Secure Next-Generation Wireless Systems and Beyond.

近年来，随着各种智能设备的普及、带宽密集型多媒体业务的迅猛发展以及基站数量的迅速增加，移动无线通信的数据流量出现了前所未有的增长。虽然目前部署的第四代（4G）网络可以容纳当前的数据流量激增，但它将无法支持2020年及以后数据流量需求的爆炸式增长和大量设备。作为回应，工业界和学术界采取了一系列举措，研究下一代（5G）及以后无线网络的使能技术。人们一致认为，5G及以后网络在高吞吐量、低延迟、高可靠性、宽带覆盖等方面的要求，只能通过多种技术的无缝融合和更高频段的探索来满足，从30到300千兆赫（GHz），甚至几百太赫兹（THz）左右。这解释了光学无线通信技术（OWC）如自由空间光通信（FSO）和可见光通信（VLC）日益普及的原因。人们对VLC技术越来越感兴趣背后的主要催化剂是发光二极管（led）的部署，预计在不久的将来，led将成为终极光源。这些led是环保的，是当今最节能的技术之一。VLC系统在可见光的瞬时强度变化的帮助下调制信息位并通过LED发射器传输信号，在接收器上使用光电二极管（pd）进行信号检测。VLC带来了很多好处：金融、技术、医疗和社会。与射频通信不同，VLC对人类是安全的。此外，VLC对所有电子设备都是安全的，因此可用于射频受限区域（例如，飞机，化工厂或医院）。由于VLC可以作为补充功能整合到现有的照明基础设施中，因此该技术具有无处不在的特点和低实施成本。此外，VLC是环保的，并提供全球，不受管制的，几乎无限的带宽。该研究计划的长期目标是利用信息理论、通信理论、信号处理和凸优化的工具和见解来解决一些新的技术挑战，以满足未来无线网络将面临的低延迟和高频谱效率的要求。该研究计划将通过追求几个短期目标来推进这些长期目标，这些短期目标旨在推导VLC系统的性能极限，并设计节能和安全的混合VLC/RF通信方案和协议。

Fueled by the proliferation and popularity of various intelligent devices, the tremendous growth of bandwidth-intensive multimedia services, and the rapid increase in the number of base stations (BSs), the mobile wireless communication has experienced an unprecedented growth in data traffic in recent years. Although the currently deploying fourth generation (4G) network may accommodate the current data traffic surge, it will not be able to support the explosive growth in data traffic demands and huge number of devices in 2020 and beyond. In response, a flurry of initiatives has been undertaken by industry and academia to research enabling technologies for the next-generation (5G) and beyond wireless networks. It is unanimously agreed that the requirements of 5G and beyond networks, in terms of high throughput, low latency, high reliability, broadband coverage, etc., can only be met via seamless integration of diverse technologies and exploration of higher frequency bands, from 30 to 300 Gigahertz (GHz), or even around few hundreds of Terahertz (THz). This explains the increasing popularity of optical wireless communications technologies (OWC) such as free space optical communication (FSO) and the visible light communications (VLC). The main catalyst behind the increasing interest in VLC technology is the deployment of light emitting diodes (LEDs), which are predicted to be the ultimate light source in the near future. These LEDs are ecologically friendly and one of today's most energy-efficient technologies. VLC systems modulate the information bits and transmit the signals through LED transmitters with the aid of a varied instantaneous intensity of the visible light, and at the receiver photodiodes (PDs) are used for signal detection. VLC comes with lots of benefits: financial, technical, medical, and social. Unlike radio frequency (RF) communications, VLC is safe for humans. In addition, VLC is safe for all electronic equipment, and thus can be used in RF restricted areas (e.g., airplanes, chemical plants or hospitals). Since VLC can be incorporated into existing lighting infrastructures as a complementary functionality, the technology has a ubiquitous character and a low implementation cost. Furthermore, VLC is eco-friendly and provides worldwide, unregulated, and almost unlimited bandwidth. The long-term objectives of the proposed research program are to use tools and insights from information theory, communications theory, signal processing and convex optimization to solve some of the new technical challenges in addressing the requirement for low latency and high spectrum efficiency that future wireless networks will face. The research program will be advancing to such long-term objectives through the pursuit of several short-term objectives aiming at deriving the performance limits of VLC systems and designing energy efficient and secure hybrid VLC/RF communications schemes and protocols.