Third International conference on advances in communication, network and computing

Research Article

Improving Reliability in Cognitive Radio Networks Using Multiple Description Coding

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  • @INPROCEEDINGS{10.1007/978-3-642-35615-5_15,
        author={Abdelaali Chaoub and Elhassane Elhaj},
        title={Improving Reliability in Cognitive Radio Networks Using Multiple Description Coding},
        proceedings={Third International conference on advances in communication, network and computing},
        proceedings_a={CNC},
        year={2012},
        month={12},
        keywords={Cognitive Radio multimedia transmission TDMA Collision Multiple Description Coding Priority Encoding Transmission SPIHT},
        doi={10.1007/978-3-642-35615-5_15}
    }
    
  • Abdelaali Chaoub
    Elhassane Elhaj
    Year: 2012
    Improving Reliability in Cognitive Radio Networks Using Multiple Description Coding
    CNC
    Springer
    DOI: 10.1007/978-3-642-35615-5_15
Abdelaali Chaoub1,*, Elhassane Elhaj2,*
  • 1: Mohammed V-Agdal University
  • 2: National Institute of Posts and Telecommunications
*Contact email: chaoub.abdelaali@gmail.com, ibnelhaj@inpt.ac.ma

Abstract

This paper looks at the problem of multimedia traffic transmission over Cognitive Radio networks in a delay sensitive context and under lossy network conditions. Secondary Users are allowed to share the vacant subchannels using the Time Division Multiple Access method based on the Opportunistic Spectrum Sharing. Each Secondary User is assigned one time slot where it habitually transmits with a certain probability. The given model allows each Secondary User to transmit opportunistically in the remaining slots. Accordingly, the reasons for packets to be discarded are threefold: primary traffic interruptions, collisions between the competing secondary users and erasures due to subchannels fading. To mitigate the collision effects, an innovative idea is to exploit the Multiple Description Coding technique. More particularly, a specific packetization framework derived from the Priority Encoding Transmission is used to deal with the packet loss pattern. Numerical simulations, in view of Message Error Probability and Spectral Efficiency, show that the system still exhibit good secondary traffic robustness despite of the presence of primary reclaims, secondary collisions and subchannel errors.