Cascaded Channel Estimation for IRS-assisted Mmwave Multi-antenna with Quantized Beamforming
Wenhui Zhang, Jindan Xu, Wei Xu, Derrick Wing Kwan Ng, and Huan Sun

TL;DR
This paper develops an optimized cascaded channel estimator for IRS-assisted mmWave multi-antenna systems with quantized beamforming, improving estimation accuracy by leveraging channel sparsity.
Contribution
It introduces a closed-form optimal estimator for cascaded channels in IRS-assisted systems, incorporating channel sparsity for enhanced performance and reduced complexity.
Findings
Proposed estimator outperforms existing methods in simulations.
Exploiting channel sparsity improves estimation accuracy.
Closed-form solution simplifies implementation.
Abstract
In this letter, we optimize the channel estimator of the cascaded channel in an intelligent reflecting surface (IRS)-assisted millimeter wave (mmWave) multi-antenna system. In this system, the receiver is equipped with a hybrid architecture adopting quantized beamforming. Different from traditional multiple-input multiple-output (MIMO) systems, the design of channel estimation is challenging since the IRS is usually a passive array with limited signal processing capability. We derive the optimized channel estimator in a closed form by reformulating the problem of cascaded channel estimation in this system, leveraging the typical mean-squared error (MSE) criterion. Considering the presence of possible channel sparsity in mmWave channels, we generalize the proposed method by exploiting the channel sparsity for further performance enhancement and computational complexity reduction.…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAdvanced Wireless Communication Technologies · Antenna Design and Analysis · Millimeter-Wave Propagation and Modeling
