Interference Mitigation Using Spectrum Sensing and Dynamic Frequency Hopping

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Wireless communications are prone to both unintentional and intentional RF interference. Such interference has significant impact on the reliability of packet transmissions. In this paper, the authors consider interference mitigation in Frequency Hopping (FH) systems. They employ Cognitive Radios (CRs) for proactive interference sensing in such systems. Through this proactive approach, they propose a scheme for dynamic adjustment of the FH sequence. Their protocol, called SSDFH, relies on exploiting the spectrum sensing capabilities of CRs for proactive detection of channel quality. They analyze the characteristics of the proposed SSDFH using a continuous-time Markov chain framework.