Abstract
A new multiple antenna-aided cascaded energy and matched filter detector (MCEM) for cognitive radio networks is proposed. Our proposed scheme is equipped with multiple receive antennas employing energy efficient energy detector (ED) and reliable matched filter (MF) to mitigate the channel fading and increase the detection performance of the secondary users (SUs). Partial decisions are first made by using cascaded energy and matched filter detector (CEM) at each antenna and then the final collaborative decision is made based on those partial decisions. The probability of detection/false alarm of the proposed scheme is presented in terms of the complementary receiver operating characteristics (ROCs). The performance of MCEM scheme is explored via MATLAB simulations that implement the clear channel assessment (CCA) modules for IEEE 802.15.4. Simulation results showed that our proposed MCEM scheme improves the detection performance and is more energy efficient as compared to CEM scheme employing single antenna and other conventional schemes.
Highlights
The explosive growth of the wireless devices over the past few years has led to the spectral congestion and an apparent scarcity in radio spectrum is felt for quite some time
The densely spaced wireless devices have resulted in spectrum overcrowded, whilst licensed band occupied with primary user (PU) is often underutilized
In our proposed multiple antenna-aided cascaded energy and matched filter detector (CEM) scheme, the channel is first detected by energy detector (ED) on ith antenna and matched filter detector (MF) on the same ith antenna is turned on when ED output is greater than λEDi
Summary
The explosive growth of the wireless devices over the past few years has led to the spectral congestion and an apparent scarcity in radio spectrum is felt for quite some time. (i) We have proposed a novel spectrum/channel sensing method called MCEM scheme for CR networks. Our MCEM scheme takes the collaborative benefits of energy efficient ED, reliable MF detector, and multiple receive antennas to improve the detection performance of SUs and mitigate the multipath channel fading, shadowing, and hidden node problem and increase the energy efficiency of our proposed MCEM detector. (ii) We implemented our MCEM scheme in CCA modules and medium access control (MAC) protocol for low powered IEEE 802.15.4 to check the effective performance of our proposed detector at network level. The operation of cascaded energy and matched filter (CEM) detector scheme on IEEE 802.15.4 upon sensing the channel is briefly explained and power consumption of our proposed MCEM scheme in IEEE 802.15.4 is elaborated .
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