Abstract
This is a tutorial paper on the concept of flexible/reconfigurable
radio systems and, especially, on the elements of flexibility residing
in the PHYsical layer (PEW). It reviews past research efforts towards
flexible radios and introduces the various ways in which a reconfigurable
transceiver can be used to provide multi-standard capabilities, link
adaptation and userlservice personalization. It overviews specific
tools developed within two IST projects aiming at such flexible transceiver
architectures and presents a specific example of a mode-selection
algorithmic architecture which incorporates all the proposed tools.
Thus, it serves to illustrate a baseband version of flexibility mechanisms.
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