Beamforming Design with Partial Channel Estimation and Feedback for FDD RIS-Assisted Systems

no code implementations • 23 Feb 2023 • Xiaochun Ge, Shanping Yu, Wenqian Shen, Chengwen Xing, Byonghyo Shim

To acquire the dominating path gain information (DPGI, also regarded as the path gains of selected dominant paths) at the base station (BS), we propose a DPGI estimation and feedback scheme by jointly beamforming design at BS and RIS.

Joint Hybrid and Passive RIS-Assisted Beamforming for MmWave MIMO Systems Relying on Dynamically Configured Subarrays

no code implementations • 12 Jan 2022 • Chenghao Feng, Wenqian Shen, Jianping An, Lajos Hanzo

Specifically, the associated bandwidth-efficiency maximization problem is transformed into a series of sub-problems, where the sub-array of phase shifters and RIS elements are jointly optimized for maximizing each sub-array's rate.

Wideband Channel Estimation for IRS-Aided Systems in the Face of Beam Squint

no code implementations • 5 Jun 2021 • Siqi Ma, Wenqian Shen, Jianping An, Lajos Hanzo

Intelligent reflecting surfaces (IRSs) improve both the bandwidth and energy efficiency of wideband communication systems by using low-cost passive elements for reflecting the impinging signals with adjustable phase shifts.

Passive Beamforming Design for Intelligent Reflecting Surface Assisted MIMO Systems

no code implementations • 2 Jun 2021 • Chenghao Feng, Wenqian Shen, Xinyu Gao, Jianping An

Firstly, we decouple the optimization problem and design the active beamforming for a given IRS configuration.

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