1st International ICST Workshop on Wireless Networks: Communication, Cooperation and Competition

Research Article

Strategies and Tradeoffs for Coded Cooperation in Wireless Networks

  • @INPROCEEDINGS{10.1109/WIOPT.2007.4480100,
        author={Marco Levorato and Stefano Tomasin and Michele Zorzi},
        title={Strategies and Tradeoffs for Coded Cooperation in Wireless Networks},
        proceedings={1st International ICST Workshop on Wireless Networks: Communication, Cooperation and Competition},
        publisher={IEEE},
        proceedings_a={WNC\^{}3},
        year={2008},
        month={3},
        keywords={Access protocols  Analytical models  Electronic mail  Fading  Interference  Performance analysis  Relays  Resource management  Statistics  Wireless networks},
        doi={10.1109/WIOPT.2007.4480100}
    }
    
  • Marco Levorato
    Stefano Tomasin
    Michele Zorzi
    Year: 2008
    Strategies and Tradeoffs for Coded Cooperation in Wireless Networks
    WNC^3
    IEEE
    DOI: 10.1109/WIOPT.2007.4480100
Marco Levorato1,*, Stefano Tomasin1,*, Michele Zorzi1,*
  • 1: DEI University of Padova Via G. Gradenigo, 6/B, I-35131 Padova (PD), Italy
*Contact email: levorato@dei.unipd.it, tomasin@dei.unipd.it, zorzi@dei.unipd.it

Abstract

In a wireless network, fading significantly affects the performance, and diversity techniques are used to overcome this issue. Cooperation among nodes provides spatial diversity by means of packet relaying. In coded cooperation, diversity is further enhanced since cooperating nodes transmit different parts of a coded packet on different channels. In this paper we analyze various combinations of coded cooperation with a hybrid automatic retransmission request (HARQ) algorithm. We assume the use of a capacity-achieving code, so that an outage event occurs when the total transmission rate exceeds the channel capacity. We first provide an analysis of the outage probabilities at the various HARQ phases for different cooperative behaviors. In order to better understand the features of the proposed protocols, we model the network operation with simple semi-Markov processes and then we evaluate metrics such as throughput, efficiency, and success probability. More complex cases, such as networks with multiple simultaneous access to the radio resource and queueing aspects, are evaluated by simulation.