Energy-Efficient Cooperative Spectrum Sensing Schemes for Cognitive Radio Networks
Rapidly rising energy costs and increasingly rigid environmental standards have led to an emerging trend of addressing "Energy efficiency" aspect of wireless communication technologies. Cognitive radio can play an important role in improving energy efficiency in wireless networks, because from the green perspective, spectrum is a natural resource which should not be wasted but be shared. In this paper, the authors propose two energy-efficient and time-saving one-bit cooperative spectrum sensing schemes, which have two stages in the spectrum sensing process. If the signal-to-noise ratio is high or no primary user exists, only one stage of coarse spectrum sensing is needed, by which the sensing time and energy are saved.