DLL architecture for OFDM based VLC transceivers in FPGA

• Autor(a) principal: Duarte, Luís Diogo Medina
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/19084
• topic: Comunicações ópticas; Sistemas de comunicação móveis

With the advent of the Information Age, communication systems have become the backbone of our society. The modern society strives to nd instant access to speci c sources of information to make time-constrained decisions. Therefore, the twenty- rst century is marked by a growing demand for bandwidth in wireless communications, as it allows users to communicate and access daily applications even from remote areas. Up to the present time, numerous breakthroughs in wireless communications were accomplished but mainly using the radio portion of the electromagnetic spectrum, which made RF to take the central role in today's communication systems. However, RF technology is a victim of its own success. Due to the tremendous increase in the number of mobile devices, RF technology cannot cope much longer with this market demand and will eventually reach a saturation point. VLC is a recently appealing technique in the eld of wireless communications that intends to complement RF technologies and is sought by many researchers as a viable alternative. VLC based on Light Emitting Diode (LED) takes advantage of these solid-state devices superior modulation capability to transmit data while assuring their lighting functionality. This work addresses the problem of achieving high bandwidth in a DLL design for OFDM based VLC broadcast systems and is inserted in a funded project called VLCLighting. The main objective of this dissertation work is to implement an e cient DLL in a Microblaze soft processor in a FPGA and to study its usage in a broadcast VLC system for lighting systems. Since two value added services were identi ed in the VLCLighting project, the proposed DLL aims at furnishing the adequate means to fragment and route those services requests while maintaining a continuous transmission ow that assures lighting and transceiver functionality. This work proposes a DLL design that was inspired in DVB and project OMEGA systems, able to describe the required amendments to full ll VLCLighting goals.