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Author

Xue-Jun Cheng

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Preprint Oct 2026

Sum Rate Maximization for Practical RIS-Enhanced Rate-Splitting Multiple Access Systems

Reconfigurable intelligent surfaces (RIS) combined with rate-splitting multiple access (RSMA) provide a promising solution for improving the spectral efficiency (SE) of sixth-generation (6G) communication systems. However, most existing studies neglect the practical coupling between the RIS phase shift and amplitude, w...

Qian Zhang, Xue-Jun Cheng, Jia-Min Shi et al. · 0 citations
Open access Sep 2026

RIS-Assisted Multiuser NOMA Networks With Imperfect CSI Under Transceiver Hardware Impairments

The incorporation of non-orthogonal multiple access (NOMA) and reconfigurable intelligent surface (RIS) provides a new solution to improve spectral efficiency. Unfortunately, the channel estimation error of RIS is noteworthy due to the absent active radio frequency link. Meanwhile, the transceivers at base stations (BS...

Qian Zhang, Mao Wang, Xue-Jun Cheng et al. · 1 citation
Open access Jul 2026

Hierarchical Beam Training and Codebook Design for Movable Antenna-Assisted Near-Field Systems

As sixth-generation (6G) communication systems evolve toward higher frequency bands and larger array apertures, the near-field range expands rapidly, making near-field channel estimation increasingly important and challenging. Beam training has been recognized as an effective approach for channel state information (CSI...

Mei-Hui Liu, Qian Zhang, Xue-Jun Cheng et al. · 0 citations
Open access Aug 2026

Joint Power Allocation and Phase-Shift Design for Beyond-Diagonal Stacked Intelligent Metasurfaces-Aided ISAC Systems

Stacked intelligent metasurfaces (SIM) provide an efficient architecture for integrated sensing and communication (ISAC) with few radio-frequency (RF) chains. However, diagonal SIM provide only element-wise phase control, so balancing multiuser communication and sensing performance may require additional layers. In thi...

Y. Jiao, Qian Zhang, Xue-Jun Cheng et al. · 0 citations
Open access Aug 2026

Joint Beamforming and Phase Shifts Design for RIS-Enabled RSMA-ISAC Systems

This letter investigates the sensing-centric design of reconfigurable intelligent surface (RIS)-enabled rate-splitting multiple access-integrated sensing and communication systems and proposes a new beam-gain approximation method to enhance the sensing beam gain while satisfying communication quality-of-service (QoS) c...

Xue-Jun Cheng, Qian Zhang, Y. Jiao et al. · 3 citations

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