Sort-based relay selection algorithm for decode-and-forward relay system

In this paper, a sort-based relay selection algorithm is proposed for decode-and-forward wireless relay systems. The proposed algorithm can reduce computational complexity and system overhead in the relay selection for practical decode-and-forward wireless relay systems with multiple sources and multiple relays. This would be a very important improvement. Firstly, the sufficient and necessary conditions for a relay to be feasible to a source are derived. By adopting relay transmission via its feasible relay, the source can improve channel capacity compared to direct transmission. Then, a sort-based relay selection algorithm is proposed based on the sufficient and necessary conditions. In the proposed algorithm, each relay makes decision on its feasibility individually, but the final source-relay paring decision is made in a centralized manner. Simulation results show that the proposed algorithm can provide considerable system performance improvement over the existing algorithm. Especially at low signal-to-noise (SNR) region, the performance of the proposed algorithm almost reaches the optimal one.

[1]  Jae Hong Lee,et al.  Partner Assignment Algorithm for Cooperative Diversity in Mobile Communication Systems , 2006, 2006 IEEE 63rd Vehicular Technology Conference.

[2]  D. G. Brennan,et al.  Linear diversity combining techniques , 2003 .

[3]  Elza Erkip,et al.  User cooperation diversity. Part I. System description , 2003, IEEE Trans. Commun..

[4]  Valentine A. Aalo,et al.  Outage Analysis of Multihop Relay Systems in Interference-Limited Nakagami- $m$ Fading Channels , 2012, IEEE Transactions on Vehicular Technology.

[5]  Aria Nosratinia,et al.  Grouping and partner selection in cooperative wireless networks , 2007, IEEE Journal on Selected Areas in Communications.

[6]  Yan Chen,et al.  Partial Channel State Information Based Cooperative Relaying and Partner Selection , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[7]  Jun Cai,et al.  Semi-Distributed User Relaying Algorithm for Amplify-and-Forward Wireless Relay Networks , 2008, IEEE Transactions on Wireless Communications.

[8]  Xuemin Shen,et al.  A cooperative diversity scheme based on quadrature signaling , 2007, IEEE Transactions on Wireless Communications.

[9]  Robert W. Heath,et al.  Hybrid-Arq in Multihop Networks with Opportunistic Relay Selection , 2007, 2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07.

[10]  Gerhard Fettweis,et al.  Relay-based deployment concepts for wireless and mobile broadband radio , 2004, IEEE Communications Magazine.

[11]  Halim Yanikomeroglu,et al.  Multihop diversity in wireless relaying channels , 2004, IEEE Transactions on Communications.

[12]  Elza Erkip,et al.  Cooperative regions and partner choice in coded Cooperative systems , 2006, IEEE Transactions on Communications.

[13]  Yuanan Liu,et al.  Improving amplify-and-forward relay selection algorithm based on partial relay link , 2010 .

[14]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.

[15]  Michael Gastpar,et al.  Cooperative strategies and capacity theorems for relay networks , 2005, IEEE Transactions on Information Theory.

[16]  Jun Cai,et al.  Packet level performance analysis in wireless user-relaying networks , 2008, IEEE Transactions on Wireless Communications.

[17]  Salama Ikki,et al.  Multihop Wireless Relaying Systems in the Presence of Cochannel Interferences: Performance Analysis and Design Optimization , 2012, IEEE Transactions on Vehicular Technology.