  The next generation wireless networks are envisioned to deal with the
expected thousand-fold increase in total mobile broadband data and the
hundred-fold increase in connected devices. In order to provide higher data
rates, improved end-to-end performance, low latency, and low energy consumption
at a low cost per transmission, the fifth generation (5G) systems are required
to overcome various handicaps of current cellular networks and wireless links.
One of the key handicaps of 5G systems is the performance degradation of the
communication link, due to the use of low-cost transceiver in high data rate.
Motivated by this in this paper, we discuss the impact of transceiver front-end
hardware imperfections on the spectrum sensing performance of cognitive radios.
