Non-Orthogonal Multiple Access (NOMA)
Non-orthogonal multiple access (NOMA) has been conceived as a breakthrough tech- nology for fifth generation (5G) wireless networks [1]–[3]. The main themes of 5G networks, namely, reduced latency, high connectivity, and ultra-fast speeds are being attributed to devising systems working on the principles of NOMA [1]. NOMA uses power domain to multiplex additional users in the time/frequency/code, slot already occupied by a mobile device.
In NOMA, the base station transmits a superposition coded signal, which is a sum of all messages of the users. The users are arranged with respect to their effective channel gains i.e., the one with the lowest gain is assumed to be at the bottom of the sequence, the one with the highest gain at the top, while the remaining are arranged in an increasing order between the two. NOMA ensures that the weaker users receive a higher frac- tion of the total power budget.
Publications
In NOMA, the base station transmits a superposition coded signal, which is a sum of all messages of the users. The users are arranged with respect to their effective channel gains i.e., the one with the lowest gain is assumed to be at the bottom of the sequence, the one with the highest gain at the top, while the remaining are arranged in an increasing order between the two. NOMA ensures that the weaker users receive a higher frac- tion of the total power budget.
Publications
- P. Swami, V. Bhatia, S. Vuppala, T. Ratnarajah "User Fairness in NOMA-HetNet Using Optimized Power Allocation and Time Slotting," IEEE Systems Journal, Vol. 15, Issue 1, pp. 1005-1014, March 2021.
- P Swami, M. K. Mishra, V. Bhatia, and T. Ratnarajah, "Performance Analysis of NOMA Enabled Hybrid Network with Limited Feedback," IEEE Trans on Vehicular Technology, Vol. 69, No. 4, pp. 4516-4521, April 2020.
- K. Singh, K. Wang, S. Biswas, Z. Ding, F. Khan, and T. Ratnarajah, "Resource Optimization in Full Duplex Non-orthogonal Multiple Access Systems," IEEE Trans on Wireless Communications, Vol. 18, No. 9, pp. 4312-4325, Sep. 2019.
- P. Swami, V. Bhatia, S. Vuppala, T. Ratnarajah "On User Offloading in NOMA-HetNet Using Repulsive Point Process," IEEE Systems Journal, Vol. 13, No. 2, pp. 1409-1420, June 2019.
- P. Swami.,V. Bhatia, S. Vuppala, T. Ratnarajah, "A Cooperation Scheme for User Fairness and Performance Enhancement in NOMA-HCNm," IEEE Trans on Vehicular Technology, Vol 67, No. 12, pp. 11965-11978, Dec. 2018..
- M-F Hanif, Z. Ding, T. Ratnarajah and G. K. Karagiannidis, "A Minorization-Maximization Method for Optimizing Sum Rate in Non-Orthogonal Multiple Access Systems," IEEE Trans. on Signal Processing, IEEE Trans. on Signal Processing, Vol. 64, No. 1, pp.76-88, Jan. 2016
- M. Sellathurai, T. Ratnarajah and P. Guinand, ''Multirate Layered Space-Time Coding and Successive Interference Cancellation Receivers in Quasi-Static Fading Channels,'' IEEE Trans. on Wireless Communications, Vol 6. Issue 12, pp. 4524-4533, Dec. 2007
