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Theoretical Investigation of Diﬀerent Diversity Combining Techniques in Cognitive Radio

Agarwal R., Srivastava N., Katiyar H.

Journal of Telecommunications and Information Technology

2018

nr 3

64--69

In this paper, the performance of an energy detector in cognitive radio, using diﬀerent diversity combining techniques, is evaluated. Among many diversity combining techniques, maximal ratio combining (MRC) gives the best results but at the cost of the highest complexity. To design a simpler receiver, it is suggested to use less complex combining techniques, i.e. switched diversity, which provides one of the least complex solutions to combat fading. The paper analyzes two switched diversity schemes, switch examine combining (SEC), and switch examine combining with post examining selection (SECp). A closed form expression determining the probability of detection using MRC, SEC and SECp is derived for various numbers of branches. Detection performance with diﬀerent diversity combining techniques is compared and the complexity trade-oﬀ is observed.