Sparse space-time-frequency-domain spreading for large-scale non-orthogonal multiple access

Liu, Yusha, Yang, Lieliang and Hanzo, Lajos (2020) Sparse space-time-frequency-domain spreading for large-scale non-orthogonal multiple access. IEEE Transactions on Vehicular Technology, 69 (10), 12327-12332, [9144439]. (doi:10.1109/TVT.2020.3010437).

Record type: Article

Abstract

A generalised spatial modulation-aided sparse space-time-frequency spreading (GSM/SSTFS) scheme is proposed for supporting large-scale access at a high normalized user-load in next-generation systems by simultaneously exploiting the transmit diversity in the spatial- and frequency-domain. Specifically, in the GSM/SSTFS system employing two transmit antennas (TAs), each user equipment (UE) spreads its signal over two symbol durations, two active TAs, and multiple subcarriers by a unique pre-assigned sparse code, in order to attain spreading in three dimensions (3D). Furthermore, with the aid of GSM, extra information bits are embedded in the TA indices. At the receiver, a joint message passing-aided (JMPA) detector is employed for attaining near-single-user bit error rate (BER) performance, which is also compared to that of conventional multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems.

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Accepted/In Press date: 16 July 2020

e-pub ahead of print date: 20 July 2020

Published date: October 2020

Additional Information: Funding Information: Manuscript received March 11, 2020; revised June 26, 2020; accepted July 15, 2020. Date of publication July 20, 2020; date of current version October 22, 2020. The work of Lajos Hanzo was supported in part by Engineering and Physical Sciences Research Council Projects EP/Noo4558/1, EP/PO34284/1, and COALESCE, of the Royal Society’s Global Challenges Research Fund Grant and in part by the European Research Council’s Advanced Fellow Grant QuantCom. The review of this article was coordinated by Prof. K. Le. (Corresponding author: Lajos Hanzo.) The authors are with the School of Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, U.K. (e-mail: yl6g15@ecs.soton.ac.uk; lly@ecs.soton.ac.uk; lh@ecs.soton.ac.uk). Digital Object Identifier 10.1109/TVT.2020.3010437 Fig. 1. An example of the uplink GSM/SSTFS network employing N = 4 to support K = 6 UEs. Publisher Copyright: © 1967-2012 IEEE.

Keywords: Generalized spatial modulation, message passing, space-time spreading

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