Sum-rate maximization of two-way amplify-and-forward relay networks with imperfect channel state information

Considering a two-way amplify-and-forward (AF) relay network and aiming to simultaneously maximize the two users' mutual information lower bounds in the presence of channel estimation errors, we study the Pareto-front of users' mutual information lower bounds. Based on the Pareto-front we investigate the optimal power allocation among the two users and the relay, as well as the optimal power allotment between training and data symbols that maximize the average sum-rate lower bound, and explore the variations of these optimal power allocation as the relay position changes. We also show that the mean square error (MSE) of channel estimation is minimized when training vectors transmitted by the two users are orthogonal.

[1]  Anna Scaglione,et al.  On the effect of receiver estimation error upon channel mutual information , 2006, IEEE Transactions on Signal Processing.

[2]  Gerhard Bauch,et al.  Self-Interference Aided Channel Estimation in Two-Way Relaying Systems , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[3]  Azadeh Vosoughi,et al.  Impact of channel estimation error upon sum-rate in amplify-and-forward two-way relaying systems , 2010, 2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC).

[4]  Ying-Chang Liang,et al.  On the Design of Optimal Training Sequence for Bi-Directional Relay Networks , 2009, IEEE Signal Processing Letters.

[5]  Shahram Shahbazpanahi,et al.  Optimal Distributed Beamforming for Two-Way Relay Networks , 2010, IEEE Transactions on Signal Processing.

[6]  Ying-Chang Liang,et al.  Optimal beamforming for two-way multi-antenna relay channel with analogue network coding , 2008, IEEE Journal on Selected Areas in Communications.

[7]  Hyundong Shin,et al.  Amplify-and-Forward Two-Way Relay Networks: Error Exponents and Resource Allocation , 2010, IEEE Transactions on Communications.

[8]  Babak Hassibi,et al.  How much training is needed in multiple-antenna wireless links? , 2003, IEEE Trans. Inf. Theory.

[9]  Shuguang Cui,et al.  On Design of Distributed Beamforming for Two-Way Relay Networks , 2010, ArXiv.

[10]  Azadeh Vosoughi,et al.  How Does Channel Estimation Error Affect Average Sum-Rate in Two-Way Amplify-and-Forward Relay Networks? , 2012, IEEE Transactions on Wireless Communications.

[11]  Azadeh Vosoughi,et al.  Two-way relaying for energy constrained systems: Joint transmit power optimization , 2010, 2010 IEEE International Conference on Acoustics, Speech and Signal Processing.

[12]  Ying-Chang Liang,et al.  Optimal channel estimation and training design for two-way relay networks , 2009, IEEE Transactions on Communications.

[13]  Stephen P. Boyd,et al.  Convex Optimization , 2004, Algorithms and Theory of Computation Handbook.

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

[15]  Shahram Shahbazpanahi,et al.  Achievable rate region and sum-rate maximization for network beamforming for bi-directional relay networks , 2010, 2010 IEEE International Conference on Acoustics, Speech and Signal Processing.