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Sixty years of coherent versus non-coherent tradeoffs and the road from 5G to wireless futures

Sixty years of coherent versus non-coherent tradeoffs and the road from 5G to wireless futures
Sixty years of coherent versus non-coherent tradeoffs and the road from 5G to wireless futures
Sixty years of coherent versus non-coherent tradeoff as well as the twenty years of coherent versus non-coherent tradeoff in Multiple-Input Multiple-Output (MIMO) systems are surveyed. Furthermore, the advantages of adaptivity are discussed. More explicitly, in order to support the diverse communication requirements of different applications in a unified platform, the 5G New Radio (NR) offers unprecedented adaptivity, abeit at the cost of a substantial amount of signalling overhead that consumes both power and the valuable spectral resources. Striking a beneficial coherent versus non-coherent tradeoff is capable of reducing the pilot overheads of channel estimation, whilst relying on low-complexity detectors, especially in high-mobility scenarios. Furthermore, since energy-efficiency is of salient importance both in the operational and future networks, following the powerful Index Modulation (IM) philosophy, we conceive a holistic adaptive philosophy striking the most appropriate coherent/non-coherent, single-/multiple-antenna and diversity/multiplexing tradeoffs, where the number of RF chains, the Peak-to-Average Power Ratio (PAPR) of signal transmission and the maximum amount of interference tolerated by signal detection are all taken into account. We demonstrate that this intelligent triple-fold adaptivity offers significant benefits in next-generation applications of mmWave and Terahertz solutions, in space-air-ground integrated networks, in full-duplex techniques and in other sophisticated channel coding assisted system designs, where powerful machine learning algorithms are expected to make autonomous decisions concerning the best mode of operation with minimal human intervention.
2169-3536
178246-178299
Xu, Chao
5710a067-6320-4f5a-8689-7881f6c46252
Ishikawa, Naoki
7330750b-e4bc-4f46-b500-e190264b2af6
Mysore rajashekar, Rakshith
d2fbbb04-57c5-4165-908f-600fc1fbdeab
Sugiura, Shinya
4c8665dd-1ad8-4dc0-9298-bf04eded3579
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Yang, Lieliang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Xu, Chao
5710a067-6320-4f5a-8689-7881f6c46252
Ishikawa, Naoki
7330750b-e4bc-4f46-b500-e190264b2af6
Mysore rajashekar, Rakshith
d2fbbb04-57c5-4165-908f-600fc1fbdeab
Sugiura, Shinya
4c8665dd-1ad8-4dc0-9298-bf04eded3579
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Yang, Lieliang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Xu, Chao, Ishikawa, Naoki, Mysore rajashekar, Rakshith, Sugiura, Shinya, Maunder, Robert, Wang, Zhaocheng, Yang, Lieliang and Hanzo, Lajos (2019) Sixty years of coherent versus non-coherent tradeoffs and the road from 5G to wireless futures. IEEE Access, 7, 178246-178299. (doi:10.1109/ACCESS.2019.2957706).

Record type: Article

Abstract

Sixty years of coherent versus non-coherent tradeoff as well as the twenty years of coherent versus non-coherent tradeoff in Multiple-Input Multiple-Output (MIMO) systems are surveyed. Furthermore, the advantages of adaptivity are discussed. More explicitly, in order to support the diverse communication requirements of different applications in a unified platform, the 5G New Radio (NR) offers unprecedented adaptivity, abeit at the cost of a substantial amount of signalling overhead that consumes both power and the valuable spectral resources. Striking a beneficial coherent versus non-coherent tradeoff is capable of reducing the pilot overheads of channel estimation, whilst relying on low-complexity detectors, especially in high-mobility scenarios. Furthermore, since energy-efficiency is of salient importance both in the operational and future networks, following the powerful Index Modulation (IM) philosophy, we conceive a holistic adaptive philosophy striking the most appropriate coherent/non-coherent, single-/multiple-antenna and diversity/multiplexing tradeoffs, where the number of RF chains, the Peak-to-Average Power Ratio (PAPR) of signal transmission and the maximum amount of interference tolerated by signal detection are all taken into account. We demonstrate that this intelligent triple-fold adaptivity offers significant benefits in next-generation applications of mmWave and Terahertz solutions, in space-air-ground integrated networks, in full-duplex techniques and in other sophisticated channel coding assisted system designs, where powerful machine learning algorithms are expected to make autonomous decisions concerning the best mode of operation with minimal human intervention.

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Accepted/In Press date: 2 December 2019
e-pub ahead of print date: 4 December 2019

Identifiers

Local EPrints ID: 436375
URI: http://eprints.soton.ac.uk/id/eprint/436375
ISSN: 2169-3536
PURE UUID: 7643c256-a0cc-40c0-b083-15bee7ec8b5b
ORCID for Chao Xu: ORCID iD orcid.org/0000-0002-8423-0342
ORCID for Rakshith Mysore rajashekar: ORCID iD orcid.org/0000-0002-7688-7539
ORCID for Robert Maunder: ORCID iD orcid.org/0000-0002-7944-2615
ORCID for Lieliang Yang: ORCID iD orcid.org/0000-0002-2032-9327
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 09 Dec 2019 17:30
Last modified: 07 Oct 2020 04:18

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Contributors

Author: Chao Xu ORCID iD
Author: Naoki Ishikawa
Author: Rakshith Mysore rajashekar ORCID iD
Author: Shinya Sugiura
Author: Robert Maunder ORCID iD
Author: Zhaocheng Wang
Author: Lieliang Yang ORCID iD
Author: Lajos Hanzo ORCID iD

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