Faster-than-Nyquist asynchronous NOMA outperforms synchronous NOMA
Faster-than-Nyquist asynchronous NOMA outperforms synchronous NOMA
Faster-than-Nyquist (FTN) signaling aided nonorthogonal multiple access (NOMA) is conceived and its achievable rate is quantified in the presence of random link delays of the different users. We reveal that exploiting the link delays may potentially lead to a signal-to-interference-plus-noise ratio (SINR) gain, while transmitting the data symbols at FTN rates has the potential of increasing the degree-of-freedom (DoF). We then unveil the fundamental trade-off between the SINR and DoF. In particular, at a sufficiently high symbol rate, the SINR gain vanishes while the DoF gain achieves its maximum, where the achievable rate is almost (1 + β) times higher than that of the conventional synchronous NOMA transmission in the high signal-to-noise ratio (SNR) regime, with β being the roll-off factor of the signaling pulse. Our simulation results verify our analysis and demonstrate considerable rate improvements over the conventional power-domain NOMA scheme.
NOMA, achievable rate, asynchronous transmission, faster-than-Nyquist signaling
1128-1145
Li, Shuangyang
72067f67-db02-4820-9e65-091d8ff39b65
Wei, Zhiqiang
7004a29f-a88a-40f6-bc92-61d93bd3286f
Yuan, Weijie
95773273-711f-44fd-8c33-1af681698f75
Yuan, Jinhong
d50102f7-4fbd-45e3-a5a9-7fee391481ce
Bai, Baoming
da03fc63-c5fb-44f2-9e28-a8406e944d43
Ng, Derrick Wing Kwan
8e2a32d3-cb0d-4c38-b05c-03ef16a5c707
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
1 April 2022
Li, Shuangyang
72067f67-db02-4820-9e65-091d8ff39b65
Wei, Zhiqiang
7004a29f-a88a-40f6-bc92-61d93bd3286f
Yuan, Weijie
95773273-711f-44fd-8c33-1af681698f75
Yuan, Jinhong
d50102f7-4fbd-45e3-a5a9-7fee391481ce
Bai, Baoming
da03fc63-c5fb-44f2-9e28-a8406e944d43
Ng, Derrick Wing Kwan
8e2a32d3-cb0d-4c38-b05c-03ef16a5c707
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Li, Shuangyang, Wei, Zhiqiang, Yuan, Weijie, Yuan, Jinhong, Bai, Baoming, Ng, Derrick Wing Kwan and Hanzo, Lajos
(2022)
Faster-than-Nyquist asynchronous NOMA outperforms synchronous NOMA.
IEEE Journal on Selected Areas in Communications, 40 (4), .
(doi:10.1109/JSAC.2022.3143245).
Abstract
Faster-than-Nyquist (FTN) signaling aided nonorthogonal multiple access (NOMA) is conceived and its achievable rate is quantified in the presence of random link delays of the different users. We reveal that exploiting the link delays may potentially lead to a signal-to-interference-plus-noise ratio (SINR) gain, while transmitting the data symbols at FTN rates has the potential of increasing the degree-of-freedom (DoF). We then unveil the fundamental trade-off between the SINR and DoF. In particular, at a sufficiently high symbol rate, the SINR gain vanishes while the DoF gain achieves its maximum, where the achievable rate is almost (1 + β) times higher than that of the conventional synchronous NOMA transmission in the high signal-to-noise ratio (SNR) regime, with β being the roll-off factor of the signaling pulse. Our simulation results verify our analysis and demonstrate considerable rate improvements over the conventional power-domain NOMA scheme.
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final
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Accepted/In Press date: 17 December 2021
e-pub ahead of print date: 14 January 2022
Published date: 1 April 2022
Additional Information:
Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 62171356. The work of Derrick Wing Kwan Ng was supported in part by the UNSW Digital Grid Futures Institute, University of New South Wales (UNSW), Sydney, under a cross-disciplinary fund scheme; and in part by the Australian Research Council s Discovery Project under Grant DP210102169. The work of Lajos Hanzo was supported in part by the Engineering and Physical Sciences Research Council under Project EP/P034284/1 and Project EP/P003990/1 (COALESCE) and in part by the European Research Council s Advanced Fellow Grant QuantCom under Grant 789028. An earlier version of this paper was presented in part at the IEEE Wireless Communications and Networking Conference 2021 [1] [DOI: 10.1109/WCNC49053.2021.9417538].
Publisher Copyright:
© 1983-2012 IEEE.
Keywords:
NOMA, achievable rate, asynchronous transmission, faster-than-Nyquist signaling
Identifiers
Local EPrints ID: 453277
URI: http://eprints.soton.ac.uk/id/eprint/453277
ISSN: 0733-8716
PURE UUID: cb538691-f3c2-4166-8ee6-08c12da740a3
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Date deposited: 11 Jan 2022 18:08
Last modified: 18 Mar 2024 02:36
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Contributors
Author:
Shuangyang Li
Author:
Zhiqiang Wei
Author:
Weijie Yuan
Author:
Jinhong Yuan
Author:
Baoming Bai
Author:
Derrick Wing Kwan Ng
Author:
Lajos Hanzo
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