731 citations · 3.8k across the 42 of their papers we have counts for
36 papers · 1 filter
Fundamental CRB-Rate Tradeoff in Multi-Antenna ISAC Systems with Information Multicasting and Multi-Target Sensing
Zixiang Ren, Yunfei Peng, Xianxin Song +5
This paper investigates the performance tradeoff for a multi-antenna integrated sensing and communication (ISAC) system with simultaneous information multicasting and multi-target…
QoS-based Beamforming and Compression Design for Cooperative Cellular Networks via Lagrangian Duality
Xilai Fan, Ya-Feng Liu, Liang Liu +1
This paper considers the quality-of-service (QoS)-based joint beamforming and compression design problem in the downlink cooperative cellular network, where multiple relay-like bas…
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…
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…
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…
Uplink-Downlink Duality Between Multiple-Access and Broadcast Channels with Compressing Relays
Liang Liu, Ya-Feng Liu, Pratik Patil +1
Uplink-downlink duality refers to the fact that under a sum-power constraint, the capacity regions of a Gaussian multiple-access channel and a Gaussian broadcast channel with Hermi…
Towards Reliable UAV Swarm Communication in D2D-Enhanced Cellular Network
Yitao Han, Liang Liu, Lingjie Duan +1
In the existing cellular networks, it remains a challenging problem to communicate with and control an unmanned aerial vehicle (UAV) swarm with both high reliability and low latenc…
Intelligent Reflecting Surface Assisted Massive MIMO Communications
Zhaorui Wang, Liang Liu, Shuguang Cui
In a practical massive MIMO (multiple-input multiple-output) system, the number of antennas at a base station (BS) is constrained by the space and cost factors, which limits the th…
Channel Estimation for Intelligent Reflecting Surface Assisted Multiuser Communications: Framework, Algorithms, and Analysis
Zhaorui Wang, Liang Liu, Shuguang Cui
In intelligent reflecting surface (IRS) assisted communication systems, the acquisition of channel state information (CSI) is a crucial impediment for achieving the beamforming gai…
Channel Estimation for Intelligent Reflecting Surface Assisted Multiuser Communications
Zhaorui Wang, Liang Liu, Shuguang Cui
In the intelligent reflecting surface (IRS) assisted communication systems, the acquisition of channel state information (CSI) is a crucial impediment for achieving the passive bea…
Joint Task Assignment and Resource Allocation for D2D-Enabled Mobile-Edge Computing
Hong Xing, Liang Liu, Jie Xu +1
With the proliferation of computation-extensive and latency-critical applications in the 5G and beyond networks, mobile-edge computing (MEC) or fog computing, which provides cloud-…
Exploiting NOMA for Multi-Beam UAV Communication in Cellular Uplink
Liang Liu, Shuowen Zhang, Rui Zhang
Unmanned aerial vehicles (UAVs) are expected to be an important new class of users in the fifth generation (5G) and beyond 5G cellular networks. In particular, there are emerging U…
Multi-Beam UAV Communication in Cellular Uplink: Cooperative Interference Cancellation and Sum-Rate Maximization
Liang Liu, Shuowen Zhang, Rui Zhang
Integrating unmanned aerial vehicles (UAVs) into the cellular network as new aerial users is a promising solution to meet their ever-increasing communication demands in a plethora…
Fundamental Tradeoffs in Communication and Trajectory Design for UAV-Enabled Wireless Network
Qingqing Wu, Liang Liu, Rui Zhang
The use of unmanned aerial vehicles (UAVs) as aerial communication platforms is of high practical value for future wireless systems such as 5G, especially for swift and on-demand d…
Sparse Signal Processing for Grant-Free Massive Connectivity: A Future Paradigm for Random Access Protocols in the Internet of Things
Liang Liu, Erik G. Larsson, Wei Yu +3
The next wave of wireless technologies will proliferate in connecting sensors, machines, and robots for myriad new applications, thereby creating the fabric for the Internet of Thi…
CoMP in the Sky: UAV Placement and Movement Optimization for Multi-User Communications
Liang Liu, Shuowen Zhang, Rui Zhang
Driven by the recent advancement in unmanned aerial vehicle (UAV) technology, this paper proposes a new wireless network architecture of \emph{coordinate multipoint (CoMP) in the s…
Channel Diagonalization for Cloud Radio Access
Liang Liu, Pratik Patil, Wei Yu
The diagonalization of a conventional multiple-input multiple-output (MIMO) channel into parallel and independent subchannels via singular value decomposition (SVD) is a fundamenta…
A D2D-based Protocol for Ultra-Reliable Wireless Communications for Industrial Automation
Liang Liu, Wei Yu
As one indispensable use case for the 5G wireless systems on the roadmap, ultra-reliable and low latency communications (URLLC) is a crucial requirement for the coming era of wirel…
Massive Connectivity with Massive MIMO-Part I: Device Activity Detection and Channel Estimation
Liang Liu, Wei Yu
This two-part paper considers an uplink massive device communication scenario in which a large number of devices are connected to a base-station (BS), but user traffic is sporadic…
Massive Connectivity with Massive MIMO-Part II: Achievable Rate Characterization
Liang Liu, Wei Yu
This two-part paper aims to quantify the cost of device activity detection in an uplink massive connectivity scenario with a large number of devices but device activities are spora…
An uplink-downlink duality for cloud radio access network
Liang Liu, Pratik Patil, Wei Yu
Uplink-downlink duality refers to the fact that the Gaussian broadcast channel has the same capacity region as the dual Gaussian multiple-access channel under the same sumpower con…
Cross-layer design for downlink multi-hop cloud radio access networks with network coding
Liang Liu, Wei Yu
There are two fundamentally different fronthaul techniques in the downlink communication of cloud radio access network (C-RAN): the data-sharing strategy and the compression-based…