Description: CR [1] is a promising solution to the problem of spectrum
scarcity in wireless communications. The basic idea of CR is
to allow secondary (unlicensed) users (SUs) to opportunistically
utilize the spectrum of PUs (licensed), provided that the
SU transmission do not harmfully affect the PUs. In this paper,
we focus on the underlay CR approach, where the SUs access
the spectrum occupied by the PUs, given that the interference
they cause to the PUs is less than a certain threshold such that
the Quality-of-Service (QoS) of the PUs can be ensured
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