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 communica...

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Veröffentlicht in:IEEE access Jg. 7; S. 178246 - 178299
Hauptverfasser: Xu, Chao, Ishikawa, Naoki, Rajashekar, Rakshith, Sugiura, Shinya, Maunder, Robert G., Wang, Zhaocheng, Yang, Lie-Liang, Hanzo, Lajos
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Piscataway IEEE 2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
5G mobile communication
5G New Radio
Algorithms
artificial intelligence
channel coding
Channel estimation
Coherence
Coherent
decision-feedback
Decoding
differential encoding
Differential phase shift keying
differential space-time modulation
energy-efficiency
full-duplex
index modulation
link budget
Machine learning
Maximum likelihood estimation
millimeter wave
Millimeter waves
MIMO (control systems)
multiple-input multiple-output
non-coherent
Orthogonal Frequency Division Multiplexing
peak-to-average power ratio
physical layer
Power consumption
Signal detection
Signal transmission
space-air-ground
sphere decoding
Terahertz
Tradeoffs
ISSN:2169-3536, 2169-3536
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Zusammenfassung: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 unprecendented 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) pholosophy, we conceive a holistic adaptive pholosophy 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 tripple-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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ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2957706