A Survey on Spectrum Sensing Techniques and Energy Harvesting
Anitha Bujunuru, Srinivasulu Tadisetty · 2018
The rapid development in wireless communication shows that the requirement of much more efficient spectrum management schemes. Several works have exhibits that majority of allocated spectrum is underutilized. Cognitive radio (CR) is a technology that aims to increase the utilization of licensed frequency spectrum by providing opportunistic access to secondary user (SU) by dynamic spectrum access without providing intervention to primary user. The most fundamental problem in CR is spectrum sensing that can detects the appearance of primary user (PU) in licensed band. Whenever the PU is under gone into fading or shadowing, spectrum sensing has lower probability of detection. The basic problems of sensing are avoided by considering cooperative spectrum sensing that requires the part of SU's energy for cooperation and this reduces the energy of the SU. In Energy harvesting, SU can harvest the RF energy from the received PU signal. This harvested energy is transformed to electric power to compensate the power required for cooperative spectrum sensing (CSS) there by improve the transmission efficiency of SU. This paper gives a analysis on spectrum sensing techniques, cooperative spectrum sensing and energy harvesting techniques.