9 citations · 34 across the 18 of their papers we have counts for
7 papers · 1 filter
Asymptotic Achievability of the Cramér-Rao Lower Bound of Channel Estimation for Reconfigurable Intelligent Surface Aided Communication Systems
Yiming Liu, Erwu Liu, Rui Wang +2
To achieve the joint active and passive beamforming gains in the reconfigurable intelligent surface assisted millimeter wave system, the reflected cascade channel needs to be accur…
Deep Deterministic Policy Gradient for Relay Selection and Power Allocation in Cooperative Communication Network
Yuanzhe Geng, Erwu Liu, Rui Wang +4
Perfect channel state information (CSI) is usually required when considering relay selection and power allocation in cooperative communication. However, it is difficult to get an a…
Hierarchical Reinforcement Learning for Relay Selection and Power Optimization in Two-Hop Cooperative Relay Network
Yuanzhe Geng, Erwu Liu, Rui Wang +1
Cooperative communication is an effective approach to improve spectrum utilization. In order to reduce outage probability of communication system, most studies propose various sche…
Reconfigurable Intelligent Surface Aided Wireless Localization
Yiming Liu, Erwu Liu, Rui Wang
The advantages of millimeter-wave and large antenna arrays technologies for accurate wireless localization received extensive attentions recently. However, how to further improve t…
Beamforming Design and Performance Evaluation for Reconfigurable Intelligent Surface Assisted Wireless Communication Systems With Non-Ideal Hardware
Yiming Liu, Erwu Liu, Rui Wang +2
Reconfigurable intelligent surface (RIS) can effectively control the wavefront of the impinging signals and has emerged as a cost-effective promising solution to improve the spectr…
Energy Efficiency Analysis of Intelligent Reflecting Surface System with Hardware Impairments
Yiming Liu, Erwu Liu, Rui Wang
Recently, as explosive growth of mobile data traffic, the performance of wireless communication systems requires to be enhanced significantly in future. Intelligent reflecting surf…
Channel Estimation and Power Scaling Law of Large Reflecting Surface with Non-Ideal Hardware
Yiming Liu, Erwu Liu, Rui Wang +1
Large reflecting surface (LRS) has emerged as a new solution to improve the energy and spectrum efficiency of wireless communication system. Most existing studies were conducted wi…