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Performance Analysis of Optimum Combining Under the Impact of Multiple Primary Interferers in Underlay Cognitive Radios


Affiliations
1 Department of Electronics and Communication Engineering, Thapar University, Patiala, 147001, India
 

This paper investigates the performance of optimum combining (OC) in underlay cognitive radio (CR) in the presence of multiple primary user's transmitters (PUT-xs) in flat Rayleigh fading channels. The number of PUT-xs 𝐿𝑑 and antennas at secondary user receiver (SU-Rx) 𝐾r are related as 𝐿𝑑 β‰₯ πΎπ‘Ÿ. Closed form expressions are obtained for the ergodic capacity and average bit error rate (BER) of the CR-OC system. Analytical results are validated through simulations. Performance of proposed system is compared with the Maximal ratio combining (MRC) in cognitive radio (CR-MRC).

Keywords

Average Bit Error Rate, Cognitive Radio, Ergodic Capacity, Maximal Ratio Combining, Optimum Combining.
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  • Performance Analysis of Optimum Combining Under the Impact of Multiple Primary Interferers in Underlay Cognitive Radios

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Authors

Rupinder Kaur
Department of Electronics and Communication Engineering, Thapar University, Patiala, 147001, India
Kavita Vij
Department of Electronics and Communication Engineering, Thapar University, Patiala, 147001, India
Surbhi Sha
Department of Electronics and Communication Engineering, Thapar University, Patiala, 147001, India

Abstract


This paper investigates the performance of optimum combining (OC) in underlay cognitive radio (CR) in the presence of multiple primary user's transmitters (PUT-xs) in flat Rayleigh fading channels. The number of PUT-xs 𝐿𝑑 and antennas at secondary user receiver (SU-Rx) 𝐾r are related as 𝐿𝑑 β‰₯ πΎπ‘Ÿ. Closed form expressions are obtained for the ergodic capacity and average bit error rate (BER) of the CR-OC system. Analytical results are validated through simulations. Performance of proposed system is compared with the Maximal ratio combining (MRC) in cognitive radio (CR-MRC).

Keywords


Average Bit Error Rate, Cognitive Radio, Ergodic Capacity, Maximal Ratio Combining, Optimum Combining.

References