READ ME File For 'Sixty Years of Coherent Versus Non-coherent Tradeoffs and the Road from 5G to Wireless Futures'

IEEE Access (Accepted on 2 Dec 2019)

Authors: Chao Xu, Naoki Ishikawa, Rakshith Rajashekar, Shinya Sugiura, Robert G. Maunder, Zhaocheng Wang, Lie-Liang Yang and Lajos Hanzo

C. Xu, R. Rajashekar, R. G. Maunder, L. L. Yang and L. Hanzo are with the School of Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK (e-mail: \{cx1g08,rmr1u14,lh\}@soton.ac.uk). N. Ishikawa is with the Graduate School of Information Sciences, Hiroshima City University, Ohzuka-higashi 731-3194, Japan (e-mail: naoki@ishikawa.cc). S. Sugiura is with the Institute of Industrial Science, University of Tokyo, Meguro-ku, Tokyo 153-8505, Japan (e-mail: sugiura@ieee.org). Z. Wang is with Tsinghua University, Beijing, China (e-mail: zcwang@tsinghua.edu.cn).

Acknowledgement: 
L. Hanzo would like to acknowledge the financial support of the Engineering and Physical Sciences Research Council projects EP/N004558/1, EP034284/1, COALESCE, of the Royal Society's Global Challenges Research Fund Grant, of the Royal Society Grant IF170002 as well as of the European Research Council's Advanced Fellow Grant QuantCom. The work of N. Ishikawa was supported in part by the Japan Society for the Promotion of Science KAKENHI under Grant 17H07036. The work of S. Sugiura was supported in part by Japan Society for the Promotion of Science (JSPS) KAKENHI under Grant Numbers 16KK0120, 17H03259, and in part by Japan Science and Technology Agency (JST) PRESTO under Grant Number JPMJPR1933.

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 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.


NOTE: .fig files are edited by Xfig in Linus systems; .dat files are read by .gle file in the same folder by gle.

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