Beixiong Zheng

TL;DR: This paper provides a tutorial overview of IRS-aided wireless communications, and elaborate its reflection and channel models, hardware architecture and practical constraints, as well as various appealing applications in wireless networks.

TL;DR: In this article, an IRS-enhanced orthogonal frequency division multiplexing (OFDM) system under frequency-selective channels is considered and a practical transmission protocol with channel estimation is proposed.

TL;DR: In this paper, a practical transmission protocol to execute channel estimation and reflection optimization successively for an IRS-enhanced orthogonal frequency division multiplexing (OFDM) system is proposed, where a novel reflection pattern at the IRS is designed to aid the channel estimation at the access point (AP) based on the received pilot signals from the user, for which the estimated CSI is derived in closed-form.

TL;DR: In this paper, a practical transmission protocol to execute channel estimation and reflection optimization successively for an IRS-enhanced orthogonal frequency division multiplexing (OFDM) system is proposed, where a novel reflection pattern at the IRS is designed to aid the channel estimation at the access point (AP) based on the received pilot signals from the user, for which the estimated CSI is derived in closed-form.

TL;DR: This letter analyzes the minimum transmit powers required by different multiple access schemes and compares them numerically, which turn out to not fully comply with the stereotyped superiority of NOMA over OMA in conventional systems without IRS, and proposes a low-complexity solution to achieve near-optimal performance.