Multi-Relay Cooperative Retransmission Strategies over Time-Correlated Channels

Time-varying property of practical wireless channels affects the performance of cooperative protocol in multi-relay networks. In this paper, we evaluate and compare four decode-and-forward (DF) retransmission strategies over time-correlated Rayleigh channels, which are the combinations of two relay selection (RS) schemes and two repeater switching patterns: RS can be based on either statistical or outdated channel state information (CSI); in the static switching pattern all forwardings are executed by the same relay that is selected at the beginning, while in the dynamic pattern relays that have not recovered the source message keep receiving from the forwarding relay to extend the decoding subset, from which the activated relay for next retransmission is reselected. Numerical simulations validate that statistical information is more beneficial than outdated CSI over weakly correlated channels. On the other hand, the dynamic switching pattern generally outperforms the static one especially with relatively large maximum transmission number, at the cost of higher complexity of decoding and signalling.

[1]  Lajos Hanzo,et al.  Relay switching aided turbo coded Hybrid-ARQ for correlated fading channel , 2011, 2011 IEEE Wireless Communications and Networking Conference.

[2]  Frank Y. Li,et al.  Optimization of the Relay Selection Scheme in Cooperative Retransmission Networks , 2011, 2011 IEEE 73rd Vehicular Technology Conference (VTC Spring).

[3]  Wei Xu,et al.  On the Design of Relay Selection Strategies in Regenerative Cooperative Networks with Outdated CSI , 2011, IEEE Transactions on Wireless Communications.

[4]  Marco Levorato,et al.  Analysis of Non-Cooperative and Cooperative Type II Hybrid ARQ Protocols with AMC over Correlated Fading Channels , 2011, IEEE Transactions on Wireless Communications.

[5]  Aggelos Bletsas,et al.  A simple Cooperative diversity method based on network path selection , 2005, IEEE Journal on Selected Areas in Communications.

[6]  Ilmu Byun,et al.  The maximum achievable throughput of a decode-and-forward based hybrid-ARQ protocol , 2009, MILCOM 2009 - 2009 IEEE Military Communications Conference.

[7]  Wan Choi,et al.  Optimal Rate Adaptation for Hybrid ARQ in Time-Correlated Rayleigh Fading Channels , 2011, IEEE Transactions on Wireless Communications.

[8]  Hirley Alves,et al.  Performance of Type-I and Type-II Hybrid ARQ in Decode and Forward Relaying , 2011, 2011 IEEE 73rd Vehicular Technology Conference (VTC Spring).

[9]  Keith Q. T. Zhang,et al.  A simple capacity formula for correlated diversity Rician fading channels , 2002, IEEE Communications Letters.

[10]  Wuyang Zhou,et al.  Bound Analysis of Physical Layer Network Coding in Interference-Limited Two-Way Relaying System , 2012, 2012 IEEE 75th Vehicular Technology Conference (VTC Spring).

[11]  Gregory W. Wornell,et al.  Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks , 2003, IEEE Trans. Inf. Theory.

[12]  Dongfeng Yuan,et al.  ARQ Based Joint Relay Selection and Cooperative Protocol Switch Cooperative Scheme , 2011, 2011 IEEE International Conference on Communications (ICC).