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Journal of Zhejiang University SCIENCE C 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/FITEE.2300120


Max-min rate optimization for multi-user MISO-OFDM systems assisted by RIS with wideband model∗


Author(s):  Yonghua QUAN, Zhong TIAN, Zhengchuan CHEN, Min WANG, Yunjian JIA

Affiliation(s):  School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China; more

Corresponding email(s):   qyh@cqu.edu.cn, ztian@cqu.edu.cn, czc@cqu.edu.cn

Key Words:  Reconfigurable intelligent surfaces, Max-min rate, Coalition-game subcarrier allocation


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Yonghua QUAN, Zhong TIAN, Zhengchuan CHEN, Min WANG, Yunjian JIA. Max-min rate optimization for multi-user MISO-OFDM systems assisted by RIS with wideband model∗[J]. Frontiers of Information Technology & Electronic Engineering, 1998, -1(-1): .

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doi="10.1631/FITEE.2300120"
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Abstract: 
reconfigurable intelligent surfaces (RISs) have the capability to change the wireless environment smartly. Considering the attenuation of subchannels and crowding users involved in the wideband system, we introduce RISs into the multi-user multi-input single-output (MU-MISO) system with orthogonal frequency division multiplexing (OFDM) for performance enhancement. Maximizing the minimum rate of dense users in an MU-MISO-OFDM system assisted by RIS with an approximate practical model is formulated as the joint optimization problem involving subcarrier allocation, transmit precoding (TPC) matrices at the base station, and RIS passive beamforming. A coalition-game subcarrier allocation (CSA) algorithm is proposed to solve space-frequency resource allocation on subcarriers, which reforms the interference topology among dense users. Fractional programming and convex optimization method are utilized to optimize the TPC matrices and the RIS passive beamforming, which improves the spectral efficiency synthetically across all subchannels in the wideband system. Simulation results indicate that the CSA algorithm provides a significant gain for dense users. Besides, the proposed joint optimization method shows the considerable advantage of the RISs in the MU-MISO-OFDM system.

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