Spatial channel pairing based coherent combining for relay networks

Abstract

In this paper, spatial channel pairing (SCP) is introduced to coherent combining at the relay in relay networks. Closed-form solution to optimal coherent combining is derived. Given coherent combining, the approximate SCP solution is presented. Finally, an alternating iterative structure is developed. Simulation results and analysis show that, given the symbol error rate and data rate, the proposed alternating iterative structure achieves signal-to-noise ratio gains over existing schemes in maximum ratio combining (MRC) plus matched filter, MRC plus antenna selection, and distributed space-time block coding due to the use of SCP and iterative structure.

Keywords

Spatial channel pairing / Coherent combining / Alternating iterative structure / Symbol error rate / Distributed space-time block coding

References

[1] Chang, M., Dong, M., 2013. SNR-based channel pairing design in multichannel TDBC-based two-way relaying. Proc. Asilomar Conf. on Signals, Systems and Computers, p.220–224.

[2] Chang, Y., Hua, Y., 2003. Application of space-time linear block codes to parallel wireless relays in mobile ad hoc networks. Proc. 37th Asilomar Conf. on Signals, Systems and Computers, p.1002–1006.

[3] Dang, W., Tao, M., Mu, H., , 2010. Subcarrierpair based resource allocation for cooperative multi-relay OFDM systems. IEEE Trans. Wirel. Commun., 9(5):1640–1649.

[4] Fang, Z., Hua, Y., Koshy, J.C., 2006. Joint source and relay optimization for a non-regenerative MIMO relay. Proc. 4th IEEE Workshop on Sensor Array and Multichannel Processing, p.239–243.

[5] Graham, R.L., Knuth, D.E., Patashnik, O., 1994. Concrete Mathematics: a Foundation for Computer Science (2nd Ed.). Addison-Wesley Professional, USA.

[6] Hammerstrom, I., Wittneben, A., 2006. On the optimal power allocation for nonregenerative OFDM relay links. Proc. IEEE Int. Conf. on Communications, p.4463–4468.

[7] Hottinen, A., Heikkinen, T., 2007. Optimal subchannel assignment in a two-hop OFDM relay. Proc. IEEE 8th Workshop on Signal Processing Advances in Wireless Communications, p.1–5.

[8] Jing, Y., 2010. Combination of MRC and distributed spacetime coding in networks with multiple-antenna relays. IEEE Trans. Wirel. Commun., 9(8):2550–2559.

[9] Jing, Y., 2013. Distributed Space-Time Coding. Springer-Verlag, New York.

[10] Jing, Y., Hassibi, B., 2006. Distributed space-time coding in wireless relay networks. IEEE Trans. Wirel. Commun., 5(12):3524–3536.

[11] Laneman, J.N., Wornell, G.W., 2003. Distributed spacetime-coded protocols for exploiting cooperative diversity in wireless networks. IEEE Trans. Inform. Theory, 49(10):2415–2425.

[12] Lee, N., Yang, H.J., Chun, J., 2008. Achievable sum-rate maximizing AF relay beamforming scheme in two-way relay channels. Proc. IEEE Int. Conf. on Communications Workshops, p.300–305.

[13] Li, C., Yang, L., Zhu, W., , 2009. Cooperative schemes for two-way relaying protocol. Proc. Asia Pacific Conf. on Postgraduate Research in Microelectronics and Electronics, p.49–52.

[14] Li, X., Zhang, Q., Zhang, G., , 2013. Joint power allocation and subcarrier pairing for cooperative OFDM AF multi-relay networks. IEEE Commun. Lett., 17(5):872–875.

[15] Li, Y., Wang, W., Kong, J., , 2009. Subcarrier pairing for amplify-and-forward and decode-and-forward OFDM relay links.IEEE Commun. Lett., 13(4):209–211.

[16] Liu, Y., Tao, M., 2012. Optimal beamforming for twoway multi-antenna relay channel with analogue network coding. IEEE Trans. Commun., 60(2):317–321.

[17] Nabar, R.U., Bolcskei, H., Kneubuhler, F.W., 2004. Fading relay channels: performance limits and space-time signal design. IEEE J. Sel. Areas Commun., 22(6):1099–1109.

[18] Nasir, A.A., Mehrpouyan, H., Durrani, S., , 2013. Transceiver design for distributed STBC based AF cooperative networks in the presence of timing and frequency offsets. IEEE Trans. Signal Process., 61(12): 3143–3158.

[19] Shu, F., Lu, Y.Z., Chen, Y., , 2014a. High-sumrate beamformers for multi-pair two-way relay networks with amplify-and-forward relaying strategy. Sci. China Inform. Sci., 57(2):1–11.

[20] Shu, F., Chen, Y., You, X.H., , 2014b. Low-complexity optimal spatial channel pairing for AF-based multi-pair two-way relay networks.Sci. China Inform. Sci., 57(10):1–10.

[21] Wang, J., Shu, F., You, X., , 2015. Space-frequency channel pairing and power allocation for OFDM-based multi-pair two-way relay wireless networks.Sci. China Inform. Sci., 45(7):878–888 (in Chinese).

[22] Wang, J., Shu, F., Huang, X., , 2016. Optimal coherent combining scheme for relay networks. Wirel. Pers. Commun., 88(3):575–585.

RIGHTS & PERMISSIONS

Zhejiang University and Springer-Verlag Berlin Heidelberg