Cross Layer Analysis of Spectrum Sensing in the Cognitive Radio Paradigm
نویسندگان
چکیده
In this paper, the performance of the carrier sense multiple access with collision avoidance (CSMA/CA) protocol at MAC layer with sensing errors at physical layer is investigated. Here the sensing errors are captured by modifying the Markov chain model widely used for the CSMA/CA analysis called Bianchi’s model. We investigate the throughput as a function of carrier sensing error probabilities: probability of missed detection and probability of false alarm for given CSMA/CA parameters. The normalized saturation throughput of CSMA/CA networks under the presence of sensing error is obtained. With imperfect carrier sensing, the false alarm error has an effect of extending the contention window size, and the missed detection error results in effects like shrinking the contention window etc. We also emphasize on the packet length (L) on the performance of the system under the presence of these errors. Keywords— Cognitive Radio, CSMA/CA, miss detection, false alarm, packet length
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