English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Reconfigurable intelligent surface (RIS) has emerged as a cost- andenergy-efficient solution to enhance the wireless communication capacity.However, recent studies show that a very large surface is required for aRIS-assisted communication system; otherwise, they may be outperformed by theconventional relay. Furthermore, the performance gain of a RIS can beconsiderably degraded by hardware impairments such as limited-resolution phaseshifters. To overcome those challenges, we propose a novel concept of hybridrelay-reflecting intelligent surface (HR-RIS), in which a single or fewelements are deployed with power amplifiers (PAs) to serve as active relays,while the remaining elements only reflect the incident signals. Twoarchitectures are proposed, including the fixed and dynamic HR-RIS. Theircoefficient matrices are obtained based on alternating optimization (AO) andpower allocation strategies, which enable understanding the fundamentalperformances of RIS and relaying-based systems with a trade-off between thetwo. The simulation results show that a significant improvement in both thespectral efficiency (SE) and energy efficiency (EE) with respect to theconventional RIS-aided system can be attained by the proposed schemes,especially, by the dynamic HR-RIS. In particular, the favorable design anddeployment of the HR-RIS are analytically derived and numerically justified.

Hybrid Relay-Reflecting Intelligent Surface-Assisted Wireless Communication