Optical and wireless convergence for 5G networks [electronic resource] / edited by: Abdelgader M Abdalla, editor, Instituto de Telecomunicacoes Jonathan Rodriguez, editor, Instituto de Telecomunicacoes, University of South Wales, Pontypridd, Wales, UK, Issa Elfergani, editor, Instituto de Telecomunicacoes, Antonio Teixeira, editor, Instituto de Telecomunicacoes