Terahertz Band Communications: System Architecture and Physical Layer Solutions
MetadataShow full item record
Growing demand for wireless spectrum has motivated research and development in underutilized or unused frequency bands such as the Terahertz frequencies (0.1-10 THz). With tens to hundreds of GHz-wide available bandwidth, the THz band can theoretically enable ultra high-bandwidth applications, such as virtual-reality video. The main challenges in THz-band communications are severe path loss caused by atmospheric absorption and low transmission power output due to small antenna size. In this dissertation, we propose a novel system architecture and algorithms to overcome these challenges and extend the effective transmission range of THz-band communications. First, we present a novel graphene-based plasmonic phased-array architecture where THz signals are directly generated and manipulated to form sharp beams. Next, we describe and propose a phase-only beamformer that maximizes the signal-to-interference ratio (SINR) and present a state-of-the-art polynomial-time approximate optimization algorithm. Then, we shift our focus to the problem of beam blockage and present a novel cooperative relaying system to extend transmission range as well as improve signal reception quality. Finally, for multimedia applications of THz-band communications (e.g. 3-D virtual reality content) we present a data embedding scheme that can augment the data rate further, while providing real-time media multiplexing capabilities and data confidentiality/security.