Differential data-aided beam training for RIS-empowered multi-antenna communications

Chen Hu, Kun; Alexandropoulos, George C.; García-Armada, Ana

Publication:
Differential data-aided beam training for RIS-empowered multi-antenna communications

dc.affiliation.dpto	UC3M. Departamento de Teoría de la Señal y Comunicaciones	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Comunicaciones	es
dc.contributor.author	Chen Hu, Kun
dc.contributor.author	Alexandropoulos, George C.
dc.contributor.author	García-Armada, Ana
dc.contributor.funder	European Commission	en
dc.contributor.funder	Ministerio de Ciencia e Innovación (España)	es
dc.date.accessioned	2023-05-23T10:12:21Z
dc.date.available	2023-05-23T10:12:21Z
dc.date.issued	2022-01
dc.description.abstract	The Reconfigurable Intelligent Surface (RIS) constitutes one of the prominent technologies for the next generation of wireless communications. It is envisioned to enhance the signal coverage in cases when the direct link of the communication is weak. Recently, beam training based on codebook selection is proposed to obtain the optimized phase configuration of the RIS. After that, the data is transmitted and received by using the classical coherent demodulation scheme (CDS). This training approach is able to avoid the large overhead required by the channel sounding process, and it also circumvents complex optimization problems. However, the beam training still requires the transmission of some reference signals to test the different phase configurations of the codebook, and the best codeword is chosen according to the measurement of the received energy of the reference signals. Then, the overhead due to the transmission of reference signals reduces the spectral efficiency. In this paper, a zero overhead beam training for RIS is proposed, relying on data transmission and reception based on non-CDS (NCDS). At the BS, the received differential data can also be used for the determination of the best beam for the RIS. Therefore, the efficiency of the system is significantly enhanced since reference signals are fully avoided. After choosing the best codebook, NCDS is still more suitable to transmit information for high mobility scenarios as compared to the classical CDS. Analytical expressions for the Signal-to-Interference and Noise Ratio (SINR) for the non-coherent RIS-empowered system are presented. Moreover, a detailed comparison between the NCDS and CDS in terms of efficiency and complexity is also given. The extensive computer simulation results verify the accuracy of the presented analysis and showcase that the proposed system outperforms the existing solutions.	en
dc.description.sponsorship	This work was supported by the Spanish National Project IRENE-EARTH under Grant PID2020-115323RB-C33/AEI/10.13039/501100011033, and in part by the European Union (EU) H2020 Reconfigurable Intelligent Sustainable Environments for 6G Wireless Networks (RISE-6G) Project under Grant 101017011.	es
dc.format.extent	14
dc.identifier.bibliographicCitation	Chen-Hu, K., Alexandropoulos, G. C., & Armada, A. G. (2022). Differential Data-Aided Beam Training for RIS-Empowered Multi-Antenna Communications. IEEE Access, 10, 113200-113213.	en
dc.identifier.doi	http://dx.doi.org/10.1109/ACCESS.2022.3217204
dc.identifier.issn	2169-3536
dc.identifier.publicationfirstpage	113200
dc.identifier.publicationlastpage	113213
dc.identifier.publicationtitle	IEEE Access	en
dc.identifier.publicationvolume	10
dc.identifier.uri	https://hdl.handle.net/10016/37338
dc.identifier.uxxi	AR/0000032795
dc.language.iso	eng
dc.publisher	IEEE
dc.relation.projectID	info:eu-repo/grantAgreement/EC/H2020/101017011/RISE-6G	en
dc.relation.projectID	Gobierno de España. PID2020-115323RB-C33/IRENE-EARTH	es
dc.rights	© 2022, the author(s)	en
dc.rights	Atribución 3.0 España	*
dc.rights.accessRights	open access	en
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/es/	*
dc.subject.eciencia	Electrónica	es
dc.subject.eciencia	Informática	es
dc.subject.eciencia	Telecomunicaciones	es
dc.subject.other	Beam training	en
dc.subject.other	Codebook	en
dc.subject.other	Differential modulation	en
dc.subject.other	Non-coherent system	en
dc.subject.other	Reconfigurable intelligent surface	en
dc.title	Differential data-aided beam training for RIS-empowered multi-antenna communications	en
dc.type	research article	*
dc.type.hasVersion	VoR	*
dspace.entity.type	Publication