Inter-Relay Interference in Two-Path Digital Relaying Systems: Detrimental or Beneficial?

This Letter studies the two-path digital relaying systems, where two relay nodes alternately forward messages from the source to the destination. By applying the signal space diversity (SSD) technique, a novel adaptive scheme is proposed to deal with the inter-relay interference (IRI). Our work reveals that, with careful protocol design, the IRI becomes a beneficial resource that can be utilized rather than a detrimental factor that has to be suppressed. Simulation results demonstrate that, in high average SNR regions, the proposed method outperforms the existing alternatives in terms of symbol error probability.

[1]  Armin Wittneben,et al.  Spectral efficient protocols for half-duplex fading relay channels , 2007, IEEE Journal on Selected Areas in Communications.

[2]  H. Vincent Poor,et al.  A comprehensive study of repetition-coded protocols in multi-user multi-relay networks , 2009, IEEE Transactions on Wireless Communications.

[3]  Tobias J. Oechtering,et al.  A new cooperative transmission scheme using the space-time delay code , 2004, ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802).

[4]  Rui Zhang.  On achievable rates of two-path successive relaying , 2009, IEEE Transactions on Communications.

[5]  Halim Yanikomeroglu,et al.  Asymptotic BER analysis of threshold digital relaying schemes in cooperative wireless systems , 2008, IEEE Transactions on Wireless Communications.

[6]  Halim Yanikomeroglu,et al.  Threshold Selection for SNR-based Selective Digital Relaying in Cooperative Wireless Networks , 2008, IEEE Transactions on Wireless Communications.

[7]  Emanuele Viterbo,et al.  Signal Space Diversity: A Power- and Bandwidth-Efficient Diversity Technique for the Rayleigh Fading Channel , 1998, IEEE Trans. Inf. Theory.

[8]  Georgios B. Giannakis,et al.  Smart Regenerative Relays for Link-Adaptive Cooperative Communications , 2006 .

[9]  Alejandro Ribeiro,et al.  Opportunistic multipath for bandwidth-efficient cooperative networking , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[10]  Georgios B. Giannakis,et al.  High-Performance Cooperative Demodulation With Decode-and-Forward Relays , 2007, IEEE Transactions on Communications.

[11]  H. Vincent Poor,et al.  Recovering Multiplexing Loss through Successive Relaying Using Repetition Coding , 2007, IEEE Transactions on Wireless Communications.