A suboptimal scheme for uplink NOMA in 5G systems

Non-orthogonal multiple access (NOMA) scheme is a key technique towards the 5th generation (5G) of wireless communication networks due to its higher spectral efficiency comparing to its orthogonal multiple access (OMA) counterpart. However, the complexity of conventional NOMA scheme is extremely high in massive-access scenes. In this paper, we propose a user-pairing based suboptimal scheme for uplink multiple-access by combining NOMA and OMA to facilitate the massive-access scenes. Furthermore, a user-pairing algorithm with O(nlogn) complexity is also derived. According to the Monte Carlo simulation, the proposed scheme shows only a little throughput loss comparing to the optimal transmission scheme in information-theoretic perspective.

[1]  Sergio Verdú,et al.  Linear multiuser detectors for synchronous code-division multiple-access channels , 1989, IEEE Trans. Inf. Theory.

[2]  Mohamed-Slim Alouini,et al.  On Multiple Users Scheduling Using Superposition Coding over Rayleigh Fading Channels , 2013, IEEE Communications Letters.

[3]  Rudolf Ahlswede,et al.  Multi-way communication channels , 1973 .

[4]  Pingzhi Fan,et al.  On the Performance of Non-Orthogonal Multiple Access in 5G Systems with Randomly Deployed Users , 2014, IEEE Signal Processing Letters.

[5]  Erik Dahlman,et al.  4G: LTE/LTE-Advanced for Mobile Broadband , 2011 .

[6]  Abdelaziz Amraoui,et al.  Achieving general points in the 2-user Gaussian MAC without time-sharing or rate-splitting by means of iterative coding , 2002, Proceedings IEEE International Symposium on Information Theory,.

[7]  Anass Benjebbour,et al.  Non-Orthogonal Multiple Access (NOMA) for Cellular Future Radio Access , 2013, 2013 IEEE 77th Vehicular Technology Conference (VTC Spring).

[8]  Henry D. Pfister,et al.  Universal codes for the Gaussian MAC via spatial coupling , 2011, 2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton).

[9]  Zhengang Pan,et al.  Toward green and soft: a 5G perspective , 2014, IEEE Communications Magazine.

[10]  Li Ping,et al.  On interleave-division multiple-access , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[11]  Jaap van de Beek,et al.  Multiple Access with Low-Density Signatures , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[12]  Muhammad Ali Imran,et al.  Uplink non-orthogonal multiple access for 5G wireless networks , 2014, 2014 11th International Symposium on Wireless Communications Systems (ISWCS).

[13]  Hosein Nikopour,et al.  Sparse code multiple access , 2013, 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC).

[14]  Abbas El Gamal,et al.  Lecture Notes on Network Information Theory , 2010, ArXiv.