Programmable Metasurface Based Multicast Systems: Design and Analysis

Journal article


Zhu, Y (2020). Programmable Metasurface Based Multicast Systems: Design and Analysis. IEEE Journal on Selected Areas in Communications. https://doi.org/10.1109/JSAC.2020.3000809
AuthorsZhu, Y
Abstract

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This paper considers a multi-antenna multicast system with programmable metasurface (PMS) based transmitter. Taking into account of the finite-resolution phase shifts of PMSs, a novel beam training approach is proposed, which achieves comparable performance as the exhaustive beam searching method but with much lower time overhead. Then, a closed-form expression for the achievable multicast rate is presented, which is valid for arbitrary system configurations. In addition, for certain asymptotic scenario, simple approximated expressions for the multicase rate are derived. Closed-form solutions are obtained for the optimal power allocation scheme, and it is shown that equal power allocation is optimal when the pilot power or the number of reflecting elements is sufficiently large. However, it is desirable to allocate more power to weaker users when there are a large number of RF chains. The analytical findings indicate that, with large pilot power, the multicast rate is determined by the weakest user. Also, increasing the number of radio frequency (RF) chains or reflecting elements can significantly improve the multicast rate, and as the phase shift number becomes larger, the multicast rate improves first and gradually converges to a limit. Moreover, increasing the number of users would significantly degrade the multicast rate, but this rate loss can be compensated by implementing a large number of reflecting elements.

KeywordsProgrammable metasurface; multicast systems; channel estimation
Year2020
JournalIEEE Journal on Selected Areas in Communications
PublisherInstitute of Electrical and Electronics Engineers
ISSN0733-8716
Digital Object Identifier (DOI)https://doi.org/10.1109/JSAC.2020.3000809
Publication dates
Print08 Jun 2020
Publication process dates
Accepted18 Feb 2020
Deposited09 Jun 2020
Accepted author manuscript
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Open
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