Cognitive radio (CR) is an enabling technology to allow unlicensed (secondary) users to
exploit the spectrum allocated to licensed (primary) users in an opportunistic manner. CR is …

A cognitive radio (CR) is a radio that can change its transmission parameters based on the
perceived availability of the spectrum bands in its operating environment. CRs support …

Under utilization of radio spectrum in traditional wireless communication systems [30], along
with the increasing spectrum demand from emerging wireless applications, is driving the …

Today's wireless networks are characterized by fixed spectrum assignment policy. The
spectral scarcity and the inefficiency in the spectrum usage necessitate a new …

Due to the increasing demand for new wireless services and applications as well as the
increasing number of wireless users, the available spectrum is becoming increasingly …

The cognitive radio (CR) is evolved as the potential technology to solve the problem of
spectrum scarcity and to meet the stringent requirements of upcoming wireless services. CR …

Cognitive radio (CR) technology is envisaged to solve the problems in wireless networks
resulting from the limited available spectrum and the inefficiency in the spectrum usage by …

The problem of spectrum scarcity and inefficiency in spectrum usage will be addressed by
the newly emerging cognitive radio paradigm that allows radios to opportunistically transmit …

Currently, the radio spectrum is statically allocated and divided between licensed and
unlicensed frequencies. Due to this inflexible policy, some frequency bands are growing in …

Cognitive radio (CR) technology enables the opportunistic use of the vacant licensed
frequency bands, thereby improving the spectrum utilization. However, the CR operation …