Changes between Version 1 and Version 2 of IEEE_COMM_MAG


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Timestamp:
Jan 28, 2009, 12:59:30 PM (15 years ago)
Author:
jdavis
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  • IEEE_COMM_MAG

    v1 v2  
    44
    55== Abstract ==
    6 Cooperation in wireless networks has shown significant performance gains in comparison to legacy wireless networks.  Cooperative wireless protocols achieve such efficiency by enabling cooperation among nods to exploit spatial diversity.  CoopMAC is a Medium Access Control (MAC) protocol that enables cooperation by using an intermediate node as a helper to a direct communication under poor channel conditions.  The helper is typically located in a position whetre it experiences a good channel with both the source and destination.  Therefore, it increases the efficiency of the communication by forwarding a packet from the source and destinatiion using high transmission rates.  In an earlier attempt, we demonstrated the benefits of cooperation at the MAC layer by implementating the CoopMAC protocol using an open source wireless driver platform.  However, due to some limitations posed by the hardware, the full potential of the protocl could not be explored. In this paper, we proceed with a complete implementation of the cooperative MAC protocl using an OFDM based software defined radio (SDR) platform.  We investigate the benefits of the SDR approach, describe the details of the implementation, as well as the experiments we reun in order to evaluate the protocol. Experimental results show that CoopMAC can easily be implemented and can lead to a significant improvement in the performance of wireless networks.
     6Cooperative networking, by leveraging the broadcast nature of the wireless channel, significantly improves system performance and constitutes a promising technology for next generation wireless networks.   Even though there is a large body of literature in cooperative communications, most of the work is limited to theoretical or simulation studies.  In order to impact the next generation of wireless technologies and standards, it is essential to demonstrate that cooperative techniques indeed work in practice.  This paper describes two programmable cooperative communication testbeds built at Polytechnic Institute of NYU to achieve this goal.  The testbeds are based on open source platforms and enable implementation of cooperative networking protocols in both the physical and the medium access control layer.  Extensive experiments carried out using the testbeds suggest not only that cooperative communication techniques can be integrated into current wireless technologies, but also that significant benefits of cooperation can be observed in terms of network throughput, delay and video quality in real applications.
    77{{{
    88        {Korakis:2009,