Xiaoli Chu

Xiaoli Chu
The University of Sheffield | Sheffield · Department of Electronic and Electrical Engineering

PhD, BEng

About

250
Publications
41,845
Reads
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6,876
Citations
Citations since 2016
150 Research Items
5649 Citations
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
Additional affiliations
January 2007 - April 2012
King's College London
Position
  • Lecturer
September 2005 - December 2006
King's College London
Position
  • Research Associate
Education
August 2001 - July 2005
The Hong Kong University of Science and Technology
Field of study
  • Electronic and Electrical Engineering
September 1997 - June 2001
Xi'an Jiaotong University
Field of study
  • Information and Communications Engineering

Publications

Publications (250)
Article
Full-text available
With the dense deployment of small cells, the impact of height difference between base stations (BSs) and user equipment (UE) on the performance of heterogeneous networks (HetNets) becomes significant. The traditional two-dimensional models are no longer sufficient to capture the three-dimensional (3D) features of dense HetNets. On the other hand,...
Article
The authors regret the errors in [1, eqs. (13), (27), (34), and (35)] . The corrections for these equations are given as follows:
Article
Full-text available
Mutualistic cooperative ambient backscatter communications (AmBC) have been proposed to improve the spectrum and energy efficiencies of Internet-of-Things (IoT) systems, where a primary link (from a primary transmitter to a primary receiver) and an AmBC link (from an IoT device to the same primary receiver) form a mutualism relationship. We note th...
Article
Full-text available
Backscatter communication (BackCom) networks are vulnerable to eavesdropping, while its secrecy performance has not been sufficiently studied. In this letter, we propose a tag selection strategy to optimize the ergodic secrecy capacity (ESC) and the secrecy outage probability (SOP) simultaneously for a multi-tag self-powered BackCom network in the...
Article
Control-and user-plane separation (CUPS) and network slicing are two key technologies to support increasing network traffic and diverse wireless services. However, the benefit of CUPS in decoupling the network coverage and data service functions has not been fully utilized to facilitate network slicing. In this paper, we present a novel CUPS-based...
Article
In this paper, we consider an intelligent reflecting surface (IRS)-assisted cognitive radio system and maximize the secondary user (SU) rate by jointly optimizing the transmit power of secondary transmitter (ST) and the IRS’s reflect beamforming, subject to the constraints of the minimum required signal-to-interference-plus-noise ratio at the prima...
Article
Energy harvesting has been recognized as a promising technique with which to effectively reduce carbon emissions and electricity expenses of base stations. However, renewable energy is inherently stochastic and intermittent, imposing formidable challenges on reliably satisfying users' time-varying wireless traffic demands. In addition, the probabil...
Preprint
Full-text available
The emerging millimeter-wave (mm-wave) unmanned aerial vehicle (UAV) air-to-ground (A2G) communications are facing the Doppler effect problem that arises from the inevitable wobbling of the UAV. The fast time-varying channel for UAV A2G communications may lead to the outdated channel state information (CSI) from the channel estimation. In this pape...
Conference Paper
In order to support delay-sensitive applications of vehicle equipment (V-UE) in the Internet-of-Vehicles (IoV) systems, it is necessary to allow V-UEs to offload their computationally intensive applications to a cloud or fog computing server. Existing works mainly focused on minimising the transmission and processing delays while ignoring the mobil...
Poster
Full-text available
We are organising the IEEE VTC2022-Spring Workshop on 'Integration of Sensing, Computing, and Communication in 6G Networks' (WS11). The paper submission deadline is 24 February 2022. Submission Link: https://vtc2022s-rr-wks.trackchair.com/track/2046
Article
Full-text available
Software-defined wireless sensor networks (SDWSN), where the data and control planes are decoupled, are more suited to handling big sensor data and effectively monitoring dynamic environments and events. To overcome the limitations of using static routing tables under high traffic intensity, such as network congestion, high packet loss rate, low th...
Article
Full-text available
Cross-domain decision-making systems are suffering a huge challenge with the rapidly emerging uneven quality of user-generated data, which poses a heavy responsibility to online platforms. Current content analysis methods primarily concentrate on non-textual contents, such as images and videos themselves, while ignoring the interrelationship betwee...
Preprint
Full-text available
In mutualistic cooperative ambient backscatter communications (AmBC), Internet-of-Things (IoT) device sends its information to a desired receiver by modulating and backscattering the primary signal, while providing beneficial multipath diversity to the primary receiver in return, thus forming a mutualism relationship between the AmBC and primary li...
Article
In this paper, we consider a backscatter-assisted wireless powered mobile edge computing (MEC) network, where multiple Internet-of-Things (IoT) nodes harvest energy from the energy signals transmitted by a power beacon (PB) and utilize the harvested energy for local computing and task offloading via hybrid backscatter communication (BackCom) and ac...
Article
Graph entropy measures have recently gained wide attention for identifying and discriminating various networks in biology, society, transportation, etc. However, existing methods cannot sufficiently explore the structural contents by merely considering the elementary invariants of a graph, ignoring the underlying patterns in higher-order features....
Article
Full-text available
Heterogeneous cellular networks (HCNs) play a significant role in 5G networks, but have mainly been modeled and analyzed on a two-dimensional (2D) plane. In this paper, we model a three-dimensional (3D) two-tier HCN consisting of macro-cells and small-cells via a stochastic geometry approach, where the base stations (BSs) in each tier are assigned...
Article
Deep learning technologies have been widely exploited to predict mobile traffic. However, individually training deep learning models for various traffic prediction tasks is not only time consuming but also unrealistic, sometimes due to limited traffic records. In this article, we propose a novel deep meta-learning based mobile traffic prediction fr...
Preprint
Full-text available
This paper investigates the system outage performance of a simultaneous wireless information and power transfer (SWIPT) based two-way decode-and-forward (DF) relay network, where potential hardware impairments (HIs) in all transceivers are considered. After harvesting energy and decoding messages simultaneously via a power splitting scheme, the ene...
Article
Full-text available
Wireless powered communication via backscatter and/or harvest-then-transmit (HTT) has been considered a promising solution to connecting nodes in the Internet-of-things (IoT) networks. However, the harvested energy at an IoT node is heavily limited by the distance between the node and the power beacon (PB) due to the high propagation loss. In this...
Article
Full-text available
Indoor base stations (BSs) equipped with multiple-input multiple-output (MIMO) antenna arrays are commonly deployed in the vicinity of a wall. The wireless friendliness of the wall, determined by the intrinsic electromagnetic (EM) and physical properties of the wall material, significantly influences the indoor wireless performance and thus needs t...
Article
Full-text available
This paper investigates the system outage performance of a simultaneous wireless information and power transfer (SWIPT) based two-way decode-and-forward (DF) relay network, where potential hardware impairments (HIs) in all transceivers are considered.After harvesting energy and decoding messages simultaneously via a power splitting scheme, the ener...
Article
Due to the limited computing capacity in mobile devices, device-to-device (D2D) computation offloading has been proposed as a promising solution to improving the quality of service in the Internet of things (IoT) networks, by allowing mobile devices to exploit spare computing resources in nearby user devices. However, a major challenge to realizing...
Article
Full-text available
Small-cell networks (SCNs), especially those operating in millimeter-wave bands, are sensitive to blockages. In this letter, we develop a three-dimensional (3D) SCN model considering blockages to investigate the impact of base-station (BS) height, BS density and blockage density on the downlink coverage probability. More specifically, we model the...
Article
Full-text available
Driven by the limited radio spectrum resources and the high energy consumption of wireless devices, symbiotic radio (SR) has recently been proposed to support passive Internet-of-things (IoT) networks, where a primary transmitter (PT) transmits information to a primary reader (PR), while passive backscatter devices (BDs) modulate their own informat...
Article
In ultra dense networks (UDNs), the dense deployment of base stations (BSs) is facing challenges due to the pronounced unbalanced traffic loads, severe inter-cell interference, and uncertain traffic demands. In this paper, we tame traffic uncertainty for the joint optimization of BS activation and user association in UDNs to mitigate interference a...
Article
Complex network (CXN) is graph network with non-trivial topological features often occurring in real systems, such as video monitoring networks, social networks and sensor networks. While there is growing research study on complex networks, the main focus has been on the analysis and modeling of large networks with static topology. Predicting and c...
Article
In ultra-dense networks, the increasing popularity of computation intensive applications imposes challenges to the resource-constrained smart mobile devices (SMDs), which may be solved by offloading these computation tasks to the nearby mobile edge computing centers. However, when massive SMDs offload computation tasks in a dynamic wireless environ...
Article
Full-text available
Wireless powered mobile edge computing (MEC) leveraging hybrid passive backscatter communications (Back-Com) and active transmissions (AT) for efficient data offloading has been investigated in Internet of Things (IoT) networks, where however the delay minimization problem has not been sufficiently studied. In this work, we propose to minimize the...
Conference Paper
Full-text available
With the ever-increasing demand for wireless connections from vehicles, vehicle-to-everything (V2X) communication has become an emerging technology to enable vehicles to communicate with other vehicles, pedestrians, and communication infrastructures. In the meantime, most communication demands are initiated by human users, whose social-activities a...
Article
This paper investigates a device-to-device (D2D) cooperative computing system, where a user can offload part of its computation task to nearby idle users with the aid of an intelligent reflecting surface (IRS). We propose to minimize the total computing delay via jointly optimizing the computation task assignment, transmit power, bandwidth allocati...
Conference Paper
Full-text available
Transmission delay is critical to time-sensitive andpower-limited Internet of Things (IoT) systems. This workproposes a hybrid transmission scheme, which enables energy-constrained sensor nodes (SNs) to deliver data to an informationfusion via a hybrid of backscatter communications (BackCom)and wireless powered active communications (WPAC). Conside...
Article
When using blockchain in mobile systems, computation intensive mining tasks pose great challenges to the processing capabilities of mobile miner equipment. Mobile edge computing (MEC) is an effective solution to alleviating the problem via task offloading. In the mining process, miners compete for rewards through puzzle solving, where only the mine...
Preprint
Full-text available
This paper investigates a device-to-device (D2D) cooperative computing system, where an user can offload part of its computation task to nearby idle users with the aid of an intelligent reflecting surface (IRS). We propose to minimize the total computing delay via jointly optimizing the computation task assignment, transmit power, bandwidth allocat...
Article
To support ultra-reliable and low-latency communication (uRLLC) in vehicular networks, the virtual cells, where multiple access points (APs) cooperatively serve one mobile node, have been proposed to reduce the end-to-end latency in the downlink. The latency can be further reduced by eliminating the need for retransmission and feedback control, i.e...
Article
Full-text available
Emerging smart Internet-of-things (IoT) applications are increasingly relying on mobile edge computing (MEC) networks, where the energy efficiency of computation is one of the most pertaining issues. In this paper, considering the limited computation capacity at the MEC server and a practical non-linear energy harvesting (EH) model for IoT devices,...
Article
Unmanned aerial vehicles (UAVs) have the advantages of high mobility, remarkable versatility, and on-demand deployment, which lead to their wide applications in various industries. In disasters or other emergency events, UAV-enabled relaying can provide a temporary wireless connection for the affected area. Thus, a UAV-enabled multi-link relaying s...
Article
Content caching has limitations on achieving cache gains (e.g., cache hit ratio) in small cell networks, due to limited storages of small base stations (SBSs) and inherent user demand patterns (i.e., initial content preferences). Two effective approaches have been proposed to exploit the potential of content caching: SBS cooperation to utilize cach...
Article
Full-text available
In this paper, we investigate the system outage probability of a simultaneous wireless information, and power transfer (SWIPT) based two-way amplify-and-forward (AF) relay network, where transceiver hardware impairments (HIs) are considered. The energy-constrained relay node processes the received signals based on a power splitting protocol, and th...
Article
Full-text available
In this paper, we are the first to analyse the performance of the carrier sense adaptive transmission (CSAT) scheme in the large-scale coexisting LTE-U and WiFi networks (CLWNets) sharing multiple unlicensed channels (UCs). As the capability of idle channel detection (ICD) has significant effect on the medium access probability (MAP) of WiFi access...
Article
Full-text available
Mobile data traffic has been largely generated indoors. However, indoor cellular networks have been studied either on a two-dimensional (2D) plane or as an intractable optimization problem for a multi-storey building. In this paper, we develop a tractable three-dimensional small-cell network model for a multi-storey building. On each storey, the sm...
Article
Full-text available
In this paper, we introduce a backscatter assisted wirelessly powered mobile edge computing (MEC) network, where each edge user (EU) can offload task bits to the MEC server via hybrid harvest-then-transmit (HTT) and backscatter communications. In particular, considering a practical non-linear energy harvesting (EH) model and a partial offloading sc...
Preprint
Full-text available
In this paper, we introduce a backscatter assisted wirelessly powered mobile edge computing (MEC) network, where each edge user (EU) can offload task bits to the MEC server via hybrid harvest-then-transmit (HTT) and backscatter communications. In particular, considering a practical non-linear energy harvesting (EH) model and a partial offloading sc...
Article
Full-text available
Indoor access points (APs) with large-scale antenna arrays would commonly be deployed in the vicinity of a wall, where wall reflection (WR) affects the indoor electromagnetic (EM) wave propagation. In this paper, we investigate the effects of WR on the per-antenna power distribution of a transmit uniform linear array (ULA) adopting a zero-forcing (...
Article
Full-text available
Harvest-then-transmit (HTT) and backscatter communications have different tradeoffs between energy harvesting and data transmission and may complement each other for increasing the achievable throughput, which however has not been sufficiently exploited by the existing works. In this work, we propose a max-min throughput based resource allocation s...
Article
Full-text available
Immersive virtual reality (VR) video is becoming increasingly popular owing to its enhanced immersive experience. To enjoy ultra-high resolution immersive VR video with wireless user equipments such as head-mounted displays (HMDs), ultra-low-latency viewport rendering and data transmission are the core prerequisites, which could not be achieved wit...
Preprint
Full-text available
In this paper, we investigate the system outage probability of a simultaneous wireless information and power transfer (SWIPT) based two-way amplify-and-forward (AF) relay network considering transceiver hardware impairments (HIs), where the energy-constrained relay node processes the received signals based on a power splitting protocol and the two...
Article
Full-text available
—The tremendous popularity of internet of things (IoT) applications and wireless devices have prompted a massive increase of indoor wireless traffic. To further explore the potential of indoor IoT wireless networks, creating constructive interactions between indoor wireless transmissions and the built environments becomes necessary. The electromagn...
Article
Full-text available
To prolong the time duration of smart mobile devices (SMDs) or enable low‐latency tasks, mobile edge computing (MEC) has emerged as a promising paradigm by offloading tasks to nearby MEC servers (MECSs). In this study the authors propose an optimisation problem to minimise the weighted sum of the total delay and energy consumption of all SMDs in a...
Preprint
Full-text available
Ambient backscatter communications (AmBackComs) have been recognized as a spectrum- and energy-efficient technology for Internet of Things, as it allows passive backscatter devices (BDs) to modulate their information into the legacy signals, e.g., cellular signals, and reflect them to their associated receivers while harvesting energy from the lega...
Article
The application of network slicing to mobile edge computing (MEC) systems has aroused great interest from both academia and industry. However, the optimization of network slicing and MEC in most existing research works only focuses on resource slicing, energy scheduling, and power allocation from the perspective of mobile devices, without consideri...
Article
Full-text available
Abstract The application of unmanned aerial vehicles (UAVs) to emerging communication systems has attracted a lot of research interests due to the advantages of UAVs, such as high mobility, flexible deployment, and cost-effectiveness. The UAV-carried base stations (UAV-BS) can provide on-demand service to users in temporary or emergency events. How...
Article
Full-text available
Due to the limited battery capacity in mobile devices, simultaneous wireless information and power transfer (SWIPT) has been proposed as a promising solution to improving the energy efficiency (EE) in Internet of things (IoT) networks, i.e., device-to-device (D2D) networks, by allowing mobile devices to harvest energy from ambient radio frequency (...
Article
Full-text available
Wireless sensor networks play an important role in Internet of Things systems and services but are prone and vulnerable to poor communication channel quality and network attacks. In this paper we are motivated to propose resilient routing algorithms for wireless sensor networks. The main idea is to exploit the link reliability along with other trad...