731 citations · 3.8k across the 42 of their papers we have counts for
8 papers · 1 filter
Covariance-Based Joint Device Activity and Delay Detection in Asynchronous mMTC
Zhaorui Wang, Ya-Feng Liu, Liang Liu
In this letter, we study the joint device activity and delay detection problem in asynchronous massive machine-type communications (mMTC), where all active devices asynchronously t…
Efficiently and Globally Solving Joint Beamforming and Compression Problem in the Cooperative Cellular Network via Lagrangian Duality
Xilai Fan, Ya-Feng Liu, Liang Liu
Consider the joint beamforming and quantization problem in the cooperative cellular network, where multiple relay-like base stations (BSs) connected to the central processor (CP) v…
Detection of Abrupt Change in Channel Covariance Matrix for Multi-Antenna Communication
Runnan Liu, Liang Liu, Dazhi He +2
The knowledge of channel covariance matrices is of paramount importance to the estimation of instantaneous channels and the design of beamforming vectors in multi-antenna systems.…
Device-Free Sensing in OFDM Cellular Network
Qin Shi, Liang Liu, Shuowen Zhang +1
This paper considers device-free sensing in an orthogonal frequency division multiplexing (OFDM) cellular network to enable integrated sensing and communication (ISAC). A novel two…
Massive MIMO Communication with Intelligent Reflecting Surface
Zhaorui Wang, Liang Liu, Shuowen Zhang +1
This paper studies the feasibility of deploying intelligent reflecting surfaces (IRSs) in massive MIMO (multiple-input multiple-output) systems to improve the performance of users…
A New Channel Estimation Strategy in Intelligent Reflecting Surface Assisted Networks
Rui Wang, Liang Liu, Shuowen Zhang +1
Channel estimation is the main hurdle to reaping the benefits promised by the intelligent reflecting surface (IRS), due to its absence of ability to transmit/receive pilot signals…
User Grouping and Reflective Beamforming for IRS-Aided URLLC
Hailiang Xie, Jie Xu, Ya-Feng Liu +2
This paper studies an intelligent reflecting surface (IRS)-aided downlink ultra-reliable and low-latency communication (URLLC) system, in which an IRS is dedicatedly deployed to as…
On Massive IoT Connectivity with Temporally-Correlated User Activity
Qipeng Wang, Liang Liu, Shuowen Zhang +1
This paper considers joint device activity detection and channel estimation in Internet of Things (IoT) networks, where a large number of IoT devices exist but merely a random subs…