Outage Analysis and Power Allocation for Space-time Block Coded Two-way Relaying

• Autorzy: Yıldız M. , Aygölü Ü.
• Języki publikacji: EN

Abstrakty

EN

In this paper, we consider the two-way relay channel (TWRC) over which communication is performed using spacetime block codes (STBC) with physical-layer network coding (PNC) protocol. The three-node two-way relaying (TWR) model consists of two end nodes (sources) simultaneously communicating with each other over a relay node where each node is equipped with two antennas and uses Alamouti’s STBC to provide diversity. We consider non-reciprocal channels where fading channel coefficients are independent for opposite directions of the same link. We first derive closed form expressions for the outage probability of the STBC-TWR system and uncoded TWRC assuming equal transmit power at each node and decode-and-forward (DF) strategy at the relay. We show that the STBC-TWR system significantly improves the uncoded TWRC outage performance. Then, to further improve the performance, we propose an optimal ower allocation in TWR scheme employing Alamouti’s STBC and PNC protocol. The optimal power allocation is obtained by maximizing the sum-rate under the total power constraint. We show that the optimal power allocation considerably improves the outage performance as well as the sum-rate compared to the equal-power case.

Słowa kluczowe

EN

MIMO system; space-time coding; two-way relaying

• Wydawca: Publishing House of Poznan University of Technology
• Czasopismo: Advances in Electronics and Telecommunications
• Rocznik: 2013
• Tom: Vol. 3, no. 5
• Strony: 25--31
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Yıldız M.

• Istanbul Technical University, Faculty of Electrical and Electronics Engineering, 34469, Maslak, Istanbul, Turkey

autor

Aygölü Ü.

• Istanbul Technical University, Faculty of Electrical and Electronics Engineering, 34469, Maslak, Istanbul, Turkey

Bibliografia

• [1] B. Rankov and A. Wittneben, “Spectral Efficient Protocols for Half-Duplex Relay Channels”, IEEE J. Sel. Areas Commun., vol. 25, no. 2, pp. 379-389, Feb. 2007.
• [2] S. Zhang, S. P. Liew and P. P. Lam, “Physical-Layer Network Coding”, ACM MOBICOM 2006, Los Angeles (CA,USA), Sep. 2006.
• [3] T. Cui, F. Gao, T. Ho, A. Nallanathan, “Distributed space-time coding for two-way wireless relay networks”, in Proc. of IEEE Int. Conf. on Commun. (ICC’08), Beijing, China, May 2008.
• [4] S.J. Alabed, J.M. Paredes, A.B. Gershman, “A simple distributed spacetime coded strategy for two-way relay channels”, IEEE Trans. Wireless Commun., vol. 11, no. 4, pp. 1260-1265, Apr. 2012.
• [5] H. Jafarkhani, Space-time Coding, Theory and Practice, Cambridge University Press, Cambridge, 2005.
• [6] Y. Jing, B. Hassibi, “Distributed space-time coding in wireless relay networks”, IEEE Trans. Wireless Commun., vol. 5, no. 12, pp. 3524-3536, Dec. 2006.
• [7] S. Alamouti, “A simple transmit diversity technique for wireless communications”, IEEE J. Sel. Areas Commun., vol. 16, no. 8, pp. 1451-1458, Oct. 1998.
• [8] N. Xu, S. Fu, “On the performance of two-way relay channels using spacetime codes”, Int. J. Commun. Systems, 2011, published online in Wiley Online Library (wileyonlinelibrary.com). DOI: 10.1002/dac.1205.
• [9] S. Sezginer, H. Sari, “Full-rate full-diversity 2×2 space-time codes of reduced decoder complexity”, IEEE Commun. Lett., vol. 11, no. 12, pp. 973-975, Dec. 2007.
• [10] Z. Wang, C. Zhang and G. Wei, “Physical-Layer Network Coding with Partial CSI”, in Proc. of IEEE ICCT 2010, Rajasthan, India, Nov. 2010.
• [11] I. Krikidis, “Relay selection for two-way relay channels with MABC DF: A diversity perspective”, IEEE Trans. Vehicular Tech., vol. 59, no. 9, pp. 4620-4628, Nov. 2010.
• [12] W. Shin, N. Lee, J.B. Lim and C. Shin, “An optimal transmit power allocation for the two-way relay channel using PLNC”, in Proc. of IEEE Int. Conf. on Commun. Workshops (ICC’09), Dresden, Germany, Jun. 2009.