48 citations · 138 across the 20 of their papers we have counts for
6 papers · 1 filter
Near-Field Channel Estimation for Extremely Large-Scale Reconfigurable Intelligent Surface (XL-RIS)-Aided Wideband mmWave Systems
Songjie Yang, Chenfei Xie, Wanting Lyu +3
Near-field communications present new opportunities over near-field channels, however, the spherical wavefront propagation makes near-field signal processing challenging. In this c…
Active 3D Double-RIS-Aided Multi-User Communications: Two-Timescale-Based Separate Channel Estimation via Bayesian Learning
Songjie Yang, Wanting Lyu, Yue Xiu +2
Double-reconfigurable intelligent surface (RIS) is a promising technique, achieving a substantial gain improvement compared to single-RIS techniques. However, in double-RIS-aided s…
Efficient Multi-Beam Training For Terahertz Wireless communications
Songjie Yang, Zhongpei Zhang, Zhenzhen Hu +2
Although Terahertz communication systems can provide high data rates, it needs high directional beamforming at transmitters and receivers to achieve such rates over a long distance…
Spectral and Energy Efficiency of Multicell Massive MIMO With Variable-Resolution ADCs Over Correlated Rayleigh Fading Channels
Youzhi Xiong, Sanshan Sun, Ning Wei +2
This paper analyzes the performance of multicell massive multiple-input and multiple-output (MIMO) systems with variable-resolution analog-to-digital converters (ADCs). In such an…
Throughput Optimal Listen-Before-Talk for Cellular in Unlicensed Spectrum
Ning Wei, Xingqin Lin, Wanwan Li +2
The effort to extend cellular technologies to unlicensed spectrum has been gaining high momentum. Listen-before-talk (LBT) is enforced in the regions such as European Union and Jap…
Optimal Relay Probing in Millimeter Wave Cellular Systems with Device-to-Device Relaying
Ning Wei, Xingqin Lin, Zhongpei Zhang
Millimeter-wave (mmWave) cellular systems are power-limited and susceptible to blockages. As a result, mmWave connectivity will be likely to be intermittent. One promising approach…