105 citations · 196 across the 40 of their papers we have counts for
7 papers · 1 filter
Movable Subarray-Aided Hybrid Beamforming for Near-Field Multiuser Communications
Xiangqian Xu, Songjie Yang, Arumugam Nallanathan
Movable antenna (MA)-enabled near-field (NF) communications offer significant potential for 6G, yet existing designs often neglect the practical constraints of hybrid beamforming (…
Precoding Matrix Indicator in the 5G NR Protocol: A Tutorial on 3GPP Beamforming Codebooks
Boyu Ning, Haifan Yin, Sixu Liu +8
This paper bridges this critical gap by providing a systematic examination of the beamforming codebook technology, i.e., precoding matrix indicator (PMI), in the 5G NR from theoret…
Flexible Precoding for Multi-User Movable Antenna Communications
Songjie Yang, Wanting Lyu, Boyu Ning +2
This letter rethinks traditional precoding in multi-user wireless communications with movable antennas (MAs). Utilizing MAs for optimal antenna positioning, we introduce a sparse o…
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…
Reconfigurable Intelligent Surface-Aided Full-Duplex mmWave MIMO: Channel Estimation, Passive and Hybrid Beamforming
Songjie Yang, Wanting Lyu, Yunis Xanthos +3
Millimeter wave (mmWave) full-duplex (FD) is a promising technique for improving capacity by maximizing the utilization of both time and the rich mmWave frequency resources. Still,…
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…