Abstract
Cognitive radio (CR) was once considered as a
breakthrough technique to reform the field of wireless
communication characterized by great spectrum efficiency
enhancement. However, for more than a decade years, this
technology has been dwelling in the academia without being
able to put expertise to good use in industry. The ultimate
reason for this phenomenon is the pervasive idea to consider
the cognitive radio network (CRN) as an add-on for existing
wireless communication systems, an inevitable result caused
by CRN related prescriptions made by FCC. This paper
analyzes why such an add-on mode for CRN is hard to be
accepted by incumbent wireless communication systems from
various perspectives. Meanwhile, we analyze feasibility to
operate CRNs integrating with incumbent wireless
communication systems from both technical and economic
perspectives.
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