Joint Power Allocation and Best-Relay Positioning for Incremental Selection Amplify-and-Forward Relaying

Incremental selection amplify-and-forward relaying (ISAF) has the best performance of outage probability among relaying strategies and has been identified as the best protocol. This paper proposes to jointly optimize power allocation (PA) and best-relay position based on cooperative diversity for ISAF in order to minimize outage probability. The closed-form solution to the adaptive allocation algorithm based on high signal-to-noise ratio (SNR) approximation of outage probability is presented, assuming maximum ratio combining (MRC) at the destination. Simulation results have shown that the system performance of outage probability with the proposal outperforms the fixed PA algorithms, and much less power is needed to achieve the same outage probability at the same effective rate. The power saving can be as much as 9 dB compared to the equal power allocation scheme.

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

[2]  Aria Nosratinia,et al.  Cooperative communication in wireless networks , 2004, IEEE Communications Magazine.

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

[4]  L.J. Cimini,et al.  New approaches for cooperative use of multiple antennas in ad hoc wireless networks , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[5]  Yi Gong,et al.  Joint power allocation and relay positioning in multi-relay cooperative systems , 2009, IET Commun..

[6]  Alexander M. Haimovich,et al.  Power allocation for cooperative relaying in wireless networks , 2005, IEEE Communications Letters.

[7]  Alexander M. Haimovich,et al.  Power allocation in a transmit diversity system with mean channel gain information , 2005, IEEE Communications Letters.

[8]  Thomas M. Cover,et al.  Elements of Information Theory , 2005 .

[9]  Francis Chung-Ming Lau,et al.  Two incremental relaying protocols for cooperative networks , 2008, IET Commun..

[10]  F.K. Jondral,et al.  Cooperative Communications in Wireless Networks - A Requested Relaying Protocol , 2007, 2007 16th IST Mobile and Wireless Communications Summit.

[11]  Mazen O. Hasna,et al.  Optimal power allocation for relayed transmissions over Rayleigh-fading channels , 2004, IEEE Transactions on Wireless Communications.

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

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

[14]  Gregory W. Wornell,et al.  Energy-efficient antenna sharing and relaying for wireless networks , 2000, 2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540).