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Abstract: We propose two novel power control policies for a two-way amplify-and-forward (AF) relaying system, in which each node (two sources and one relay) is assumed to operate under both minimum and peak power constraints. Through the exploitation of instantaneous channel gains, the first policy can maximize the sum rate of the system. However, the instantaneous channel gains may be unavailable in a rapid time-varying system, where the first policy is inoperable. Consequently, a robust power control policy which requires only mean channel gains is proposed to maximize the upper bound of the average sum rate, and the properties of this policy are investigated. Simulation results show that, by comparison with the policy in which all the nodes use their peak transmit power, the proposed power control policies can provide considerable system performance improvement. Furthermore, the performance difference between the two proposed policies is negligible when the relay is close to one source.

[1]Agustin, A., Vidal, J., Munoz, O., 2009. Protocols and Resource Allocation for the Two-Way Relay Channel with Half-Duplex Terminals. Proc. IEEE Int. Conf. on Communications, p.1-5.

[2]Cover, T.M., El Gamal, A., 1979. Capacity theorems for the relay channel. IEEE Trans. Inform. Theory, 25(5):572-584.

[3]Deng, X., Haimovich, A., 2005. Power allocation for cooperative relaying in wireless networks. IEEE Commun. Lett., 9(11):994-996.

[4]Gjendemsjø, A., Gesbert, D., Øien, G.E., Kiani, S.G., 2008. Binary power control for multi-cell capacity maximization. IEEE Trans. Wirel. Commun., 7(8):3164-3173.

[5]Han, Y., Ting, S.H., Ho, C.K., Chin, W.H., 2009. Performance bounds for two-way amplify-and-forward relaying. IEEE Trans. Wirel. Commun., 8(1):432-439.

[6]Ho, C.K., Zhang, R., Liang, Y., 2008. Two-Way Relaying over OFDM: Optimized Tone Permutation and Power Allocation. Proc. IEEE Int. Conf. on Communications, p.3908-3912.

[7]Laneman, J.N., 2002. Cooperative Diversity in Wireless Networks: Algorithms and Architectures. PhD Thesis, Massachusetts Institute of Technology, Massachusetts, USA.

[8]Laneman, J.N., Tse, D., Wornel, G.W., 2004. Cooperative diversity in wireless networks: efficient protocols and outage behavior. IEEE Trans. Inform. Theory, 50(12):3062-3080.

[9]Pabst, R., Walke, B.H., Schultz, D.C., Herhold, P., Yanikomeroglu, H., Mukherjee, S., Visvanathan, H., Lott, M., Zirwas, W., Dohler, M., et al., 2004. Relay-based deployment concepts for wireless and mobile broadband radio. IEEE Commun. Mag., 42(9):80-89.

[10]Popovski, P., Yomo, H., 2007. Physical Network Coding in Two-Way Wireless Relay Channels. Proc. IEEE Int. Conf. on Communications, p.707-712.

[11]Rankov, B., Wittneben, A., 2007. Spectral efficient protocols for half-duplex fading relay channels. IEEE J. Sel. Areas Commun., 25(2):379-389.

[12]Yang, Y., Hu, H.L., Xu, J., Mao, G.Q., 2009. Relay technologies for Wimax and LTE-advanced mobile systems. IEEE Commun. Mag., 47(10):100-105.

[13]Zhang, Y.Y., Ma, Y., Tafazolli, R., 2010. Power allocation for bidirectional AF relaying over Rayleigh fading channels. IEEE Commun. Lett., 14(2):145-147.