Future wireless services are expected to provide data-rates in the order of 1Gbps in local area and 100Mbps in wide area. A very wide bandwidth is required to support such high rates, in the order of 100MHz: this wideband will not be available for each operator, thus a shared access to the spectrum among operators is needed. An holistic approach to spectrum sharing is adopted in this paper: not a single layer or component is optimized, but the system as a whole. Advanced Physical Layer (PHY) and Radio Resource Management (RRM) solutions, utilizing some cognitive radio concepts, are discussed.
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