Flexible spectrum use and better coexistence at the physical layer of future wireless systems via a multicarrier platform

C-N2-N- Company 2 bandwidth ABSTRACT In this article we propose a new multicarrier platform to optimize the efficiency of wireless operators' licensed hands and enable flexible shar- ing of licensed and unlicensed hands (in different spectral regions). This research, besides introduc- ing a high degree of flexibility of spectrum use for 4G systems, supports a recent FCC proposal that goes beyond suggesting improved spectral efficien- cy, and instead suggests innovative spectrum man- agement regulations. Specifically, this work presents a multicarrier platform capable of achiev- ing high spectral efficiency by the application of narrow orthogonal carriers, that enables flexible spectral sharing across different licensed and unli- censed bands via operator borrowingilending.