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A new class of structured beamforming for content-centric fog radio access networks

A new class of structured beamforming for content-centric fog radio access networks
A new class of structured beamforming for content-centric fog radio access networks
A multi-user fog radio access network (F-RAN) is designed for supporting content-centric services. The requested contents are partitioned into sub-contents, which are then ‘beamformed’ by the remote radio heads (RRHs) for transmission to the users. Since a large number of beamformers must be designed, this poses a computational challenge. We tackle this challenge by proposing a new class of regularized zero forcing beamforming (RZFB) for directly mitigating the inter-content interferences, while the ‘intra-content interference’ is mitigated by successive interference cancellation at the user end. Thus each beamformer is decided by a single real variable (for proper Gaussian signaling) or by a pair of complex variables (for improper Gaussian signaling). Hence the total number of decision variables is substantially reduced to facilitate tractable computation. To address the problem of energy efficiency optimization subject to multiple constraints, such as individual user-rate requirement and the fronthauling constraint of the links between the RRHs and the centralized baseband signal processing unit, as well as the total transmit power budget, we develop low-complexity path-following algorithms. Finally, we confirm their performance by simulations.
0090-6778
Zhu, Wenbo
5996f1d5-1840-4430-a9a4-10c993db0805
Tuan, Hoang Duong
d4ab81d8-7122-4973-9919-ab0e4149026d
Dutkiewicz, Eryk
758c11d4-76a2-4df8-8ec9-451a8ff91aab
Fang, Yong
ee01e563-d859-4b84-a6da-c60a530de500
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Zhu, Wenbo
5996f1d5-1840-4430-a9a4-10c993db0805
Tuan, Hoang Duong
d4ab81d8-7122-4973-9919-ab0e4149026d
Dutkiewicz, Eryk
758c11d4-76a2-4df8-8ec9-451a8ff91aab
Fang, Yong
ee01e563-d859-4b84-a6da-c60a530de500
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Zhu, Wenbo, Tuan, Hoang Duong, Dutkiewicz, Eryk, Fang, Yong and Hanzo, Lajos (2021) A new class of structured beamforming for content-centric fog radio access networks. IEEE Transactions on Communications. (In Press)

Record type: Article

Abstract

A multi-user fog radio access network (F-RAN) is designed for supporting content-centric services. The requested contents are partitioned into sub-contents, which are then ‘beamformed’ by the remote radio heads (RRHs) for transmission to the users. Since a large number of beamformers must be designed, this poses a computational challenge. We tackle this challenge by proposing a new class of regularized zero forcing beamforming (RZFB) for directly mitigating the inter-content interferences, while the ‘intra-content interference’ is mitigated by successive interference cancellation at the user end. Thus each beamformer is decided by a single real variable (for proper Gaussian signaling) or by a pair of complex variables (for improper Gaussian signaling). Hence the total number of decision variables is substantially reduced to facilitate tractable computation. To address the problem of energy efficiency optimization subject to multiple constraints, such as individual user-rate requirement and the fronthauling constraint of the links between the RRHs and the centralized baseband signal processing unit, as well as the total transmit power budget, we develop low-complexity path-following algorithms. Finally, we confirm their performance by simulations.

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Accepted/In Press date: 9 August 2021

Identifiers

Local EPrints ID: 450946
URI: http://eprints.soton.ac.uk/id/eprint/450946
ISSN: 0090-6778
PURE UUID: 541e88cc-4144-4686-ab1e-e353689c2ff4
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 25 Aug 2021 16:31
Last modified: 17 Mar 2024 02:35

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Contributors

Author: Wenbo Zhu
Author: Hoang Duong Tuan
Author: Eryk Dutkiewicz
Author: Yong Fang
Author: Lajos Hanzo ORCID iD

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