Longxiang Yang
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View article: On the Performance of Downlink Channel Estimation‐Based Cell‐Free Massive MIMO Systems Under Correlated Rician Fading Channels
On the Performance of Downlink Channel Estimation‐Based Cell‐Free Massive MIMO Systems Under Correlated Rician Fading Channels Open
The prevailing research on cell‐free massive multiple‐input multiple‐output (MIMO) systems posits that, due to channel reciprocity and channel hardening properties, user equipment (UEs) can decode downlink data solely based on uplink stati…
View article: A hierarchical reinforcement learning approach for energy‐aware service function chain dynamic deployment in IoT
A hierarchical reinforcement learning approach for energy‐aware service function chain dynamic deployment in IoT Open
Traffic volume is increasing dramatically due to the quick development of technologies like online gaming, on‐demand video streaming, and the Internet of Things (IoT). The telecommunications industry's large‐scale expansion is increasing i…
View article: Downlink Transmissions of UAV-RIS-Assisted Cell-Free Massive MIMO Systems: Location and Trajectory Optimization
Downlink Transmissions of UAV-RIS-Assisted Cell-Free Massive MIMO Systems: Location and Trajectory Optimization Open
In this paper, we investigate a cell-free massive multiple-input multiple-output (CF-mMIMO) system with a reconfigurable intelligent surface (RIS) carried by an unmanned aerial vehicle (UAV), called the UAV-RIS. Compared with the RIS locat…
View article: An Architecture for AoI and Cache Hybrid Multicast/Unicast/D2D With Cell-Free Massive MIMO Systems
An Architecture for AoI and Cache Hybrid Multicast/Unicast/D2D With Cell-Free Massive MIMO Systems Open
The leitmotif of this paper aims at providing an architecture for the age of information (AoI) and cache-assisted hybrid multicast/unicast/device-to-device (D2D) transmission with the promising cell-free massive multiple-input multiple-out…
View article: Securing Dynamic Service Function Chain Orchestration in EC-IoT Using Federated Learning
Securing Dynamic Service Function Chain Orchestration in EC-IoT Using Federated Learning Open
Dynamic service orchestration is becoming more and more necessary as IoT and edge computing technologies continue to advance due to the flexibility and diversity of services. With the surge in the number of edge devices and the increase in…
View article: Secure and Intelligent Service Function Chain for Sustainable Services in Healthcare Cyber Physical Systems
Secure and Intelligent Service Function Chain for Sustainable Services in Healthcare Cyber Physical Systems Open
The gradual integration of Internet of Things (IoT) devices has made the healthcare cyber physical systems (CPSs) ubiquitous and complex. Since IoT devices are heterogeneous, it is crucial to virtualize these devices in a general way so as…
View article: A combinatorial precoding scheme of cell‐free massive MIMO with channel aging
A combinatorial precoding scheme of cell‐free massive MIMO with channel aging Open
Here, we investigate the precoding schemes for the downlink data transmission of a time‐division duplex cell‐free massive multiple‐input multiple‐output (MIMO) system with channel aging, which arises from the user mobility. Closed‐form spe…
View article: Energy-Efficient Virtual Resource Allocation of Slices in Vehicles-Assisted B5G Networks
Energy-Efficient Virtual Resource Allocation of Slices in Vehicles-Assisted B5G Networks Open
Academia community started the research beyond 5G (B5G) while 5G systems and networks are still being landed for large-scale commercial applications. In order to enhance the agility and flexibility attributes of B5G networks, network funct…
View article: Downlink Analysis for the D2D Underlaid Multigroup Multicast Cell-Free Massive MIMO With Low-Resolution ADCs/DACs
Downlink Analysis for the D2D Underlaid Multigroup Multicast Cell-Free Massive MIMO With Low-Resolution ADCs/DACs Open
To fully utilize the scarce spectrum resources, the downlink device-to-device (D2D) underlaid multigroup multicast cell-free massive multi-input multi-output (MIMO) systems is proposed, where the geographically distributed access points (A…
View article: Embedding Security Awareness for Virtual Resource Allocation in 5G Hetnets Using Reinforcement Learning
Embedding Security Awareness for Virtual Resource Allocation in 5G Hetnets Using Reinforcement Learning Open
n the 5G era, heterogeneous networks (Het-Nets) are designed for achieving data rates and customized service demands. To realize this, virtualization technologies are widely accepted as enablers for implementing 5G HetNets, aimed at managi…
View article: Interior-stress fields produced by a general axisymmetric punch
Interior-stress fields produced by a general axisymmetric punch Open
This work is a supplement to the work of Sneddon on axisymmetric Boussinesq problem in 1965 in which the distributions of interior-stress fields are derived here for a punch with general profile. A novel set of mathematical procedures is i…
View article: Analysis and Optimization for Downlink Cell-Free Massive MIMO System with Mixed DACs
Analysis and Optimization for Downlink Cell-Free Massive MIMO System with Mixed DACs Open
This paper concentrates on the rate analysis and optimization for a downlink cell-free massive multi-input multi-output (MIMO) system with mixed digital-to-analog converters (DACs), where some of the access points (APs) use perfect-resolut…
View article: An Edge-Fog Computing Framework for Cloud of Things in Vehicle to Grid Environment
An Edge-Fog Computing Framework for Cloud of Things in Vehicle to Grid Environment Open
The penetration of electric vehicles (EVs) embedded with information and communication technology (ICT) devices and tools form a huge connected network that can be viewed as Internet-of-EVs(IoEV). The huge data gathered in IoEV network nee…
View article: Joint Multioperator Virtual Network Sharing and Caching in Energy Harvesting-Aided Environmental Internet of Things
Joint Multioperator Virtual Network Sharing and Caching in Energy Harvesting-Aided Environmental Internet of Things Open
Environmental monitoring is one of the fundamental applications of the Internet of Things (IoT), and caching in energy harvesting-aided IoT is a promising solution to handle the energy charging of the IoT nodes in the vast monitoring area.…
View article: Joint resource optimisation in cell‐free massive MIMO with low‐resolution ADCs
Joint resource optimisation in cell‐free massive MIMO with low‐resolution ADCs Open
In this study, the uplink performance of cell‐free massive multi‐input multi‐output (mMIMO) system with multi‐antenna access points (APs) and users is investigated, assuming low‐resolution analogue–digital converters (ADCs) are employed at…
View article: NoViSec: Novel Virtual Network Mapping Framework for Secure Software-Defined Networking
NoViSec: Novel Virtual Network Mapping Framework for Secure Software-Defined Networking Open
Network softwarization technologies, such as software defined networking (SDN), network virtualization (NV), and network function virtualization (NFV), emerge and have been greatly promoted by their supporters. This softwarization scheme c…
View article: Alternating Optimization Based Hybrid Precoding Strategies for Millimeter Wave MIMO Systems
Alternating Optimization Based Hybrid Precoding Strategies for Millimeter Wave MIMO Systems Open
In millimeter wave (mmWave) multiple-input multiple-output (MIMO) systems, the hybrid beamforming architecture has been put forward to reduce the high hardware cost and power consumption, which are resulted from the tremendous requirements…
View article: Power Optimization in Cell‐Free Massive MIMO with Non‐ideal Hardware Transceiver
Power Optimization in Cell‐Free Massive MIMO with Non‐ideal Hardware Transceiver Open
A downlink cell-free massive Multipleinput multiple-output (mMIMO) system is explored. To investigate the impact of hardware distortion on downlink cell-free mMIMO, this paper recalls a well-established model of hardware impairment and der…
View article: Spatially Correlated Rayleigh Fading for Cell-Free Massive MIMO Systems
Spatially Correlated Rayleigh Fading for Cell-Free Massive MIMO Systems Open
In this paper, we present the detailed rate analysis for cell-free massive multiple-input multiple-output (MIMO) systems over spatially correlated Rayleigh fading channels. Taking the realistic impairment effects of spatial channel correla…
View article: Cell-free massive MIMO: Zero forcing and conjugate beamforming receivers
Cell-free massive MIMO: Zero forcing and conjugate beamforming receivers Open
In this paper, the uplink performance of cell-free massive multi-input multi-output (mMIMO) system with the zero-forcing (ZF) and conjugate beamforming (CB) receivers is investigated. A novel tight approximate rate expression for the ZF re…
View article: Distributed Green Offloading and Power Optimization in Virtualized Small Cell Networks With Mobile Edge Computing
Distributed Green Offloading and Power Optimization in Virtualized Small Cell Networks With Mobile Edge Computing Open
Virtualized small cell networks (SCNs) integrated with mobile edge computing (MEC) is a promising paradigm to provide both wideband access and intensive computation economically for user equipments (UEs) in the scenario of multiple mobile …
View article: Collaborative attributes and resources for single-stage virtual network mapping in network virtualization
Collaborative attributes and resources for single-stage virtual network mapping in network virtualization Open
Virtual network embedding (VNE) is the virtualized node and link resources allocation problem in network virtualization environment, aiming at achieving the simultaneous optimal node and link mapping assignment per VN. Currently, a large n…
View article: Dynamic Embedding and Quality of Service-Driven Adjustment for Cloud Networks
Dynamic Embedding and Quality of Service-Driven Adjustment for Cloud Networks Open
Cloud computing built on virtualization technologies can provide Internet service providers (SPs) with elastic virtualized node and link resources. SPs can outsource their virtualized resources as customized virtual networks (VNs) to end u…
View article: Mapping strategy for virtual networks in one stage
Mapping strategy for virtual networks in one stage Open
In the area of network virtualisation, virtual network embedding (VNE) refers to the resource allocation problem. In the literature, researchers have proposed multiple VNE algorithms. These algorithms have the goal of accommodating as many…
View article: CoMP and power allocation in 5G ultra dense networks
CoMP and power allocation in 5G ultra dense networks Open
5G Ultra-Dense Network(UDN) allows a large number of high-density low-power transmission points(TPs) to be deployed in heterogeneous networks(HetNets). It greatly improves the system performance whereas introduces inter-cell interference(I…
View article: Hybrid Self-Backhaul and Cache Assisted Millimeter Wave Two-Tier Heterogeneous Networks With MIMO Equipped Backhaul Access Points
Hybrid Self-Backhaul and Cache Assisted Millimeter Wave Two-Tier Heterogeneous Networks With MIMO Equipped Backhaul Access Points Open
This paper focuses on effective content delivering over the co-channel and full millimeter-wave (mm-Wave) heterogeneous networks (HetNets) by using hybrid self-backhaul and cache-assisted (HSBC-assisted) content delivering. Especially, the…
View article: Notice of Violation of IEEE Publication Principles: Dynamic Embedding and Scheduling of Service Function Chains for Future SDN/NFV-Enabled Networks
Notice of Violation of IEEE Publication Principles: Dynamic Embedding and Scheduling of Service Function Chains for Future SDN/NFV-Enabled Networks Open
Currently, software-defined networking (SDN) and network function virtualization (NFV) are the two most promising approaches for implementing network virtualization (NV). Traditional TCP/IP-based networks (e.g. Internet) will be transforme…
View article: On the Performance of Cell-Free Massive MIMO With Low-Resolution ADCs
On the Performance of Cell-Free Massive MIMO With Low-Resolution ADCs Open
This paper considers an uplink cell-free massive multi-input multi-output (mMIMO) system with multi-antenna access points (APs) and users, assuming low-resolution analog-to-digital converter (ADC) architecture is employed at the APs. Lever…
View article: Cross-Tier Dual-Connectivity Designs of Three-Tier Hetnets With Decoupled Uplink/Downlink and Global Coverage Performance Evaluation
Cross-Tier Dual-Connectivity Designs of Three-Tier Hetnets With Decoupled Uplink/Downlink and Global Coverage Performance Evaluation Open
In the conventionally coupled uplink (UL) and downlink (DL) association (CUDA) scheme, the UL performance is limited greatly by the DL parameters such as the density and power of base stations (BSs). To overcome this issue, this paper focu…
View article: <i>ER-VNE</i>: A Joint Energy and Revenue Embedding Algorithm for Embedding Virtual Networks
<i>ER-VNE</i>: A Joint Energy and Revenue Embedding Algorithm for Embedding Virtual Networks Open
Network virtualization (NV) has been accepted as the integral paradigm of next generation network (e.g., 5G virtualized network) since its inception. Virtual network embedding (VNE) is the resource optimization problem for NV. Over the pas…