Cooperative/Relay Communications
COOPERATIVE communications has triggered enormous research interest in understanding the performance of different multi-way relay channels (MWRCs). The MWRC can be viewed as an extension of the two-way relay channel (TWRC), where two users exchange their information via a relay. In multi-way relay scenario, several users try to exchange their information with each other with the help of relays, where direct links between the source nodes whether exist or are not considered either due to large scale path loss or shadowing effects. Similar to two-way relaying, self interference can be removed by exploring the priori information at the source nodes.
Research
Members Involved : K. Singh
We study the multi-way relaying scenario with M users who want to exchange their information with each other with the help of N relays (N M) among them. There are no direct transmission channels between any two users. Particularly, all users transmit their signals to all relays in the first time slot and M − 1 relays are selected later to broadcast their mixture signals during the following M − 1 time slots to all users. Compared to the transmission with the help of single relay, the multi-way relaying scenario reduces the transmit time significantly from 2M to M time slots.
Publications
Research
Members Involved : K. Singh
We study the multi-way relaying scenario with M users who want to exchange their information with each other with the help of N relays (N M) among them. There are no direct transmission channels between any two users. Particularly, all users transmit their signals to all relays in the first time slot and M − 1 relays are selected later to broadcast their mixture signals during the following M − 1 time slots to all users. Compared to the transmission with the help of single relay, the multi-way relaying scenario reduces the transmit time significantly from 2M to M time slots.
Publications
- K. Singh, A. Gupta, T. Ratnarajah, and M-L Ku, "A General Approach Toward Green Resource Allocation in Relay-Assisted Multiuser Communication Networks," IEEE Trans on Wireless Communications, Vol. 17, Issue 2, pp. 848-862, Feb. 2018.
- K. Singh, A. Gupta and T. Ratnarajah, "A Utility-Based Joint Subcarrier and Power Allocation for Green Communications in Multi-user Two-Way Regenerative Relay Networks," IEEE Trans. on Communications, Vol. 65, Issue 9, pp. 3705-3722, Sep. 2017
- K. Singh, A. Gupta and T.Ratnarajah, "QoS-Driven Resource Allocation and EE-Balancing for Multiuser Two-Way Amplify-and-Forward Relay Networks," IEEE Trans on Wireless Communications, Vol. 16, Issue 5, pp. 3189-3204, March 2017.
- K. Singh, A. Gupta and T.Ratnarajah "Energy Efficient Resource Allocation for Multiuser Relay Networks," IEEE Trans on Wireless Communications, Vol. 16, Issue 2, pp. 1218-1235, Feb. 2017.
- K. Singh, A. Gupta and T.Ratnarajah "QoS-Driven Energy-Efficient Resource Allocation in Multiuser Amplify-and-Forward Relay Networks," IEEE Trans. on Signal and Information Processing over Networks,Vol. 3, Issue 4, pp. 771-786, Dec. 2017.
- J.Xue, T.Ratnarajah, M. Sellathurai and Z. Ding, "Performance Analysis for Multi-Way Relaying in Rician Fading Channels," IEEE Trans on Communications, Vol. 63, No. 11, pp. 4050-4062, Nov. 2015.
- Y. Zhang, J. Xue and T.Ratnarajah, "Error Exponents Analysis of Dual-hop \eta-\mu and \kappa-\mu Fading Channel with Amplify-and-Forward Relaying," IET Communications, Vol. 9, Iss. 11, pp.1367-1379, 2015.
- C. Zhong, T. Ratnarajah, S. Jin, and K-K Wong, "Performance Analysis of Optimal Beamforming in MIMO Dual-Hop AF Systems", IEEE Journal on Selected Areas in Communications, Vol. 30, No. 8, pp. 1415-1427, Sep. 2012
- F. AL-Qahtani, C. Zhong, K. A. Qaraqe, H. Alnuweiri and T. Ratnarajah, "Performance Analysis of Fixed-Gain AF Dual-Hop Relaying Systems over Nakagami-m Fading Channels in the Presence of Interference," EURASIP Journal on Wireless Communications and Networking, pp. 1-10, 2011.
- C. Zhong, M Matthaiou, G. K. Karagiannidis and T. Ratnarajah, "Generic Ergodic Capacity Bounds for Fixied-Gain AF Dual-Hop Relaying Systems", IEEE Trans on Vehicular Technology, Vol. 60, No. 8, pp. 3814-3824, Oct. 2011.
- C. Zhong, T. Ratnarajah, and K-K Wong, "Outage Analysis of Decode-and-Forward Dual-Hop Systems with Interference Constraint in Nakagami-m Fading Channels," IEEE Trans on Vehicular Technology, Vol. 60, No. 6, pp. 2875-2879, July 2011.
- Y. Gong, Z. Ding, T. Ratnarajah and C. F. N. Cowan, "Turbo Channel Estimation and Equalization for a Superposition-based Cooperative System," IEE Proc. on Communications, Vol. 3, Issue 11, pp. 1790-1799, Nov. 2010.
- Z. Ding, T. Ratnarajah and C. Cowan, ''Spectrally Efficient Cooperative Diversity Protocol for Uplink Wireless Transmission,'' IEE Proc. on Signal processing, Vol. 3, Issue 5, pp. 368-380, 2009.
- Z. Ding, T. Ratnarajah and K. K. Leung, "On the Study of Network Coded AF Transmission Protocol for Wireless Multiple Access Channels," IEEE Trans. on Wireless Communications, Vol. 7, Part 2, Issue 11, pp. 4568-4574, Nov. 2008.
- Z. Ding, Y. Gong, T. Ratnarajah and C.F.N. Cowan, "On the performance of opportunistic cooperative wireless networks," IEEE Trans. on Communications, Vol. 56, No. 8, pp. 1236-1240, Aug. 2008.
- Z. Ding, T. Ratnarajah, C. Cowan, ''On the Diversity-Multiplexing Tradeoff for Wireless Cooperative Multiple Access Systems,'' IEEE Trans. on Signal Processing, Vol. 55, No. 9, pp. 4627-4638, Sep. 2007
