Active RIS vs. Passive RIS: Which Will Prevail in 6G?
National Engineering Research Center for Information Technology in Agriculture · Tsinghua University · +1 more institution
Abstract
As a revolutionary paradigm for controlling wireless channels, reconfigurable intelligent surfaces (RISs) have emerged as a candidate technology for future 6G networks. However, due to the “multiplicative fading” effect, the existing passive RISs only achieve limited capacity gains in many scenarios with strong direct links. In this paper, the concept of active RISs is proposed to overcome this fundamental limitation. Unlike passive RISs that reflect signals without amplification, active RISs can amplify the reflected signals via amplifiers integrated into their elements. To characterize the signal amplification and incorporate the noise introduced by the active components, we develop and verify the signal…
Citation impact
- FWCI
- 85.14
- Percentile
- 100%
- References
- 44
Authors
7- ZZZijian ZhangCorresponding
National Engineering Research Center for Information Technology in Agriculture, Tsinghua University
- LDLinglong Dai
National Engineering Research Center for Information Technology in Agriculture, Tsinghua University
- XCXibi Chen
National Engineering Research Center for Information Technology in Agriculture, Tsinghua University
- CLChanghao Liu
National Engineering Research Center for Information Technology in Agriculture, Tsinghua University
- FYFan Yang
National Engineering Research Center for Information Technology in Agriculture, Tsinghua University
Topics & keywords
- Beamforming
- Electronic engineering
- Fading
- Wireless
- Precoding
- Maximization
- Computer science
- Amplifier