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http://hdl.handle.net/10397/107110
Title: | Intelligent reflecting surface aided multicasting with random passive beamforming | Authors: | Tao, Q Zhang, S Zhong, C Zhang, R |
Issue Date: | Jan-2021 | Source: | IEEE wireless communications letters, Jan. 2021, v. 10, no. 1, p. 92-96 | Abstract: | In this letter, we consider a multicast system where a single-antenna transmitter sends a common message to multiple single-antenna users, aided by an intelligent reflecting surface (IRS) equipped with N passive reflecting elements. Prior works on IRS have mostly assumed the availability of channel state information (CSI) for designing its passive beamforming. However, the acquisition of CSI requires substantial training overhead that increases with N. In contrast, we propose in this letter a novel random passive beamforming scheme, where the IRS performs independent random reflection for Q ≥ 1 times in each channel coherence interval without the need of CSI acquisition. For the proposed scheme, we first derive a closed-form approximation of the outage probability, based on which the optimal Q with best outage performance can be efficiently obtained. Then, for the purpose of comparison, we derive a lower bound of the outage probability with traditional CSI-based passive beamforming. Numerical results show that a small Q is preferred in the high-outage regime (or with high rate target) and the optimal Q becomes larger as the outage probability decreases (or as the rate target decreases). Moreover, the proposed scheme significantly outperforms the CSI-based passive beamforming scheme with training overhead taken into consideration when N and/or the number of users are large, thus offering a promising CSI-free alternative to existing CSI-based schemes. | Keywords: | Intelligent reflecting surface Multicast Outage probability Random passive beamforming |
Publisher: | Institute of Electrical and Electronics Engineers | Journal: | IEEE wireless communications letters | ISSN: | 2162-2337 | EISSN: | 2162-2345 | DOI: | 10.1109/LWC.2020.3021473 | Rights: | © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The following publication Q. Tao, S. Zhang, C. Zhong and R. Zhang, "Intelligent Reflecting Surface Aided Multicasting With Random Passive Beamforming," in IEEE Wireless Communications Letters, vol. 10, no. 1, pp. 92-96, Jan. 2021 is available at https://doi.org/10.1109/LWC.2020.3021473. |
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