Longxiang Yang

ORCID

Publication Activity (10 Years)

Years Active: 2003-2024
Publications (10 Years): 142

Top Venues

IEEE Access

WCSP

IET Commun.

IEEE Internet Things J.

Publications

Haotong Cao, Neeraj Kumar, Longxiang Yang, Mohsen Guizani, F. Richard Yu
Resource Orchestration and Allocation of E2E Slices in Softwarized UAVs-Assisted 6G Terrestrial Networks. IEEE Trans. Netw. Serv. Manag. 21 (1) (2024)
Yao Zhang, Haitao Zhao, Wenchao Xia, Longxiang Yang, Hongbo Zhu
Rate Analysis and Optimization of IRS-Aided Hardware-Impaired Cell-Free Massive MIMO Systems Under Correlated Ricean Fading Channels. IEEE Trans. Veh. Technol. 73 (8) (2024)
Xu Qiao, Yao Zhang, Haitao Zhao, Longxiang Yang, Hongbo Zhu
Two-Layer Large Scale Fading Precoding for Cell-Free Massive MIMO: Performance Analysis and Optimization. IEEE Trans. Veh. Technol. 73 (3) (2024)
Haotong Cao, Sahil Garg, Georges Kaddoum, Mubarak Alrashoud, Longxiang Yang
Efficient Resource Allocation of Slicing Services in Softwarized Space-Aerial-Ground Integrated Networks for Seamless and Open Access Services. IEEE Trans. Veh. Technol. 73 (7) (2024)
Xu Qiao, Yao Zhang, Jun Zhang, Hao Fang, Longxiang Yang, Hongbo Zhu
Novel Beamforming Design for IRS-Assisted Cell-Free Massive MIMO Systems. IEEE Wirel. Commun. Lett. 13 (4) (2024)
Haotong Cao, Longxiang Yang, Sahil Garg, Mubarak Alrashoud, Mohsen Guizani
Softwarized Resource Allocation of Tailored Services with Zero Security Trust in 6G Networks. IEEE Wirel. Commun. 31 (2) (2024)
Hao Fang, Han Hu, Yao Zhang, Xu Qiao, Longxiang Yang, Hongbo Zhu
Achievable Rate Analysis and Power Optimization for Cell-Free Massive MIMO URLLC Systems Over Aging and Correlated Channels. IEEE Internet Things J. 11 (14) (2024)
Hao Fang, Han Hu, Yao Zhang, Xu Qiao, Longxiang Yang, Hongbo Zhu
Cell-Free Massive MIMO for URLLC With Imperfect Channel Reciprocity. IEEE Wirel. Commun. Lett. 13 (7) (2024)
Haotong Cao, Sahil Garg, Shahid Mumtaz, Mubarak Alrashoud, Longxiang Yang, Georges Kaddoum
Softwarized Resource Allocation in Digital Twins-Empowered Networks for Future Quantum-Enabled Consumer Applications. IEEE Trans. Consumer Electron. 70 (1) (2024)
Haitao Zhao, Yao Zhang, Wenchao Xia, Yiyang Ni, Longxiang Yang, Hongbo Zhu
Distributed Opportunistic Power Control for Uplink Cell-Free Massive MIMO-IoT Networks Under Ricean Fading Channels. IEEE Trans. Netw. Serv. Manag. 21 (2) (2024)
Qi Zhang, Jie Zhao, Rongcheng Zhang, Longxiang Yang
Downlink Transmissions of UAV-RIS-Assisted Cell-Free Massive MIMO Systems: Location and Trajectory Optimization. Sensors 24 (13) (2024)
Shuyi Wang, Longxiang Yang
A Survey of Service Function Chain Orchestration Based on Neural Network. VTC Fall (2023)
Bowen Li, Han Hu, Longxiang Yang, Fuhui Zhou
Game-Based Task Offloading and Resource Allocation in Multi-UAV-Assisted MEC Networks. ICCC (2023)
Haotong Cao, Anish Jindal, Han Hu, Md. Jalil Piran, Longxiang Yang
Secure and Intelligent Service Function Chain for Sustainable Services in Healthcare Cyber Physical Systems. IEEE Trans. Netw. Sci. Eng. 10 (5) (2023)
Yao Zhang, Wenchao Xia, Haitao Zhao, Gan Zheng, Sangarapillai Lambotharan, Longxiang Yang
Performance Analysis of RIS-Assisted Cell-Free Massive MIMO Systems With Transceiver Hardware Impairments. IEEE Trans. Commun. 71 (12) (2023)
Meng Zhou, Jinwen Li, Jiantao Yuan, Mangang Xie, Weiqiang Tan, Rui Yin, Longxiang Yang
An Architecture for AoI and Cache Hybrid Multicast/Unicast/D2D With Cell-Free Massive MIMO Systems. IEEE Access 11 (2023)
Qi Zhang, Zewei Chai, Lifu Wang, Longxiang Yang, Qiang Wang
Deployment Optimization in Cell-Free Massive MIMO with Joint Aerial and Ground APs. ICCT (2023)
Xin Tu, Hao Fang, Yao Zhang, Jie Yang, Longxiang Yang
RIS-assisted Spatially Correlated Cell-Free Massive MIMO System. ICCC (2023)
Yulun Cheng, Haitao Zhao, Yiyang Ni, Wenchao Xia, Longxiang Yang, Hongbo Zhu
A Game-Theoretic Incentive Mechanism for Battery Saving in Full Duplex Mobile Edge Computing Systems With Wireless Power Transfer. IEEE Trans. Netw. Serv. Manag. 20 (3) (2023)
Meng Zhou, Jinwen Li, Anping Wan, Jiantao Yuan, Rui Yin, Longxiang Yang
Rate analysis of ZF receiver for uplink cell-free massive MIMO systems with D2D communications. Phys. Commun. 58 (2023)
Yunfeng Qi, Hao Fang, Zhengcong Dai, Longxiang Yang, Yao Zhang
Beamforming Optimization for Cell-Free MIMO Systems Aided by Irregular RIS. ICCT (2023)
Xiaozhen Zhu, Longxiang Yang
Joint Active and Passive Beamforming Design in RIS-Aided Cell-Free Massive MIMO Systems for Aerial Networks. VTC Fall (2023)
Haotong Cao, Zhi Lin, Longxiang Yang, Jiangzhou Wang, Mohsen Guizani
DT-SFC-6G: Digital Twins Assisted Service Function Chains in Softwarized 6G Networks for Emerging V2 X. IEEE Netw. 37 (4) (2023)
Yanmei Zhu, Zhonghua Liu, Zhijian Wang, Longxiang Yang, Keshu Peng, Kai Liu
Tobacco Traceability and Storage Scheme Based on IPFS+ Consortium Chain. BIC (2022)
Xu Qiao, Yao Zhang, Longxiang Yang, Hongbo Zhu
Pilot Contamination Precoding Method for Cell-Free Massive MIMO Systems. ICCC (2022)
Yao Zhang, Wenchao Xia, Gan Zheng, Haitao Zhao, Longxiang Yang, Hongbo Zhu
Secure Transmission in Cell-Free Massive MIMO With Low-Resolution DACs Over Rician Fading Channels. IEEE Trans. Commun. 70 (4) (2022)
Yao Zhang, Haitao Zhao, Wenchao Xia, Jun Zhang, Longxiang Yang, Hongbo Zhu
Wireless-Powered Cell-Free Massive MIMO With Superimposed Pilot Transmission. IEEE Commun. Lett. 26 (7) (2022)
Run Luo, Xu Qiao, Hao Fang, Yufei Qiao, Zhencong Dai, Longxiang Yang
Ant Colony Optimization Based Pilot Assignment for Cell-Free Massive MIMO Systems. ICCC (2022)
Xu Qiao, Yao Zhang, Meng Zhou, Longxiang Yang, Hongbo Zhu
Downlink Achievable Rate of D2D Underlaid Cell-Free Massive MIMO Systems With Low-Resolution DACs. IEEE Syst. J. 16 (3) (2022)
Haotong Cao, Jianbo Du, Haitao Zhao, Daniel Xiapu Luo, Neeraj Kumar, Longxiang Yang, F. Richard Yu
Toward Tailored Resource Allocation of Slices in 6G Networks With Softwarization and Virtualization. IEEE Internet Things J. 9 (9) (2022)
Yao Zhang, Longxiang Yang, Hongbo Zhu
Cell-Free Massive MIMO Systems With Low-Resolution ADCs: The Rician Fading Case. IEEE Syst. J. 16 (1) (2022)
Jinwen Li, Anping Wan, Meng Zhou, Jiantao Yuan, Rui Yin, Longxiang Yang
Downlink Analysis for the D2D Underlaid Multigroup Multicast Cell-Free Massive MIMO With Low-Resolution ADCs/DACs. IEEE Access 10 (2022)
Yao Zhang, Haitao Zhao, Wenchao Xia, Feifei Gao, Longxiang Yang, Hongbo Zhu
Superimposed Pilot Transmission in Cell-Free Massive MIMO With Non-Ideal RF Responses. IEEE Trans. Veh. Technol. 71 (12) (2022)
Yao Zhang, Wenchao Xia, Haitao Zhao, Wei Xu, Kai-Kit Wong, Longxiang Yang
Cell-Free IoT Networks With SWIPT: Performance Analysis and Power Control. IEEE Internet Things J. 9 (15) (2022)
Shuyi Wang, Longxiang Yang
Securing Dynamic Service Function Chain Orchestration in EC-IoT Using Federated Learning. Sensors 22 (23) (2022)
Yulun Cheng, Jun Zhang, Jing Zhang, Haitao Zhao, Longxiang Yang, Hongbo Zhu
Small-Cell Sleeping and Association for Energy-Harvesting-Aided Cellular IoT With Full-Duplex Self-Backhauls: A Game-Theoretic Approach. IEEE Internet Things J. 9 (3) (2022)
Hao Fang, Han Hu, Longxiang Yang, Yao Zhang, Xu Qiao
A combinatorial precoding scheme of cell-free massive MIMO with channel aging. IET Commun. 16 (16) (2022)
Haotong Cao, Haitao Zhao, Daniel Xiapu Luo, Neeraj Kumar, Longxiang Yang
Dynamic Virtual Resource Allocation Mechanism for Survivable Services in Emerging NFV-Enabled Vehicular Networks. IEEE Trans. Intell. Transp. Syst. 23 (11) (2022)
Meng Zhou, Yao Zhang, Xu Qiao, Mangang Xie, Longxiang Yang, Hongbo Zhu
Multigroup Multicast Downlink Cell-Free Massive MIMO Systems With Multiantenna Users and Low-Resolution ADCs/DACs. IEEE Syst. J. 16 (3) (2022)
Haotong Cao, Haitao Zhao, Anish Jindal, Gagangeet Singh Aujla, Longxiang Yang
Energy-Efficient Virtual Resource Allocation of Slices in Vehicles-Assisted B5G Networks. IEEE Trans. Green Commun. Netw. 6 (3) (2022)
Haotong Cao, Gagangeet Singh Aujla, Sahil Garg, Georges Kaddoum, Longxiang Yang
Embedding Security Awareness for Virtual Resource Allocation in 5G Hetnets Using Reinforcement Learning. IEEE Commun. Stand. Mag. 5 (2) (2021)
Meng Zhou, Longxiang Yang, Hongbo Zhu
Sum-SE for Multigroup Multicast Cell-Free Massive MIMO With Multi-Antenna Users and Low-Resolution DACs. IEEE Wirel. Commun. Lett. 10 (8) (2021)
Yao Zhang, Xu Qiao, Longxiang Yang, Hongbo Zhu
Superimposed Pilots are Beneficial for Mitigating Pilot Contamination in Cell-Free Massive MIMO. IEEE Commun. Lett. 25 (1) (2021)
Haotong Cao, Yue Hu, Longxiang Yang
Towards intelligent virtual resource allocation in UAVs-assisted 5G networks. Comput. Networks 185 (2021)
Yao Zhang, Qi Zhang, Han Hu, Longxiang Yang, Hongbo Zhu
Cell-Free Massive MIMO Systems With Non-Ideal Hardware: Phase Drifts and Distortion Noise. IEEE Trans. Veh. Technol. 70 (11) (2021)
Yao Zhang, Yulun Cheng, Meng Zhou, Longxiang Yang, Hongbo Zhu
Analysis of Uplink Cell-Free Massive MIMO System With Mixed-ADC/DAC Receiver. IEEE Syst. J. 15 (4) (2021)
Yulun Cheng, Wenchao Xia, Haitao Zhao, Longxiang Yang, Hongbo Zhu
Joint Caching and User Association for Energy Harvesting Aided Internet of Things with Full-Duplex Backhauls. J. Commun. Inf. Networks 6 (4) (2021)
Yao Zhang, Longxiang Yang, Hongbo Zhu
On the spectral efficiency of cell-free large-scale MIMO non-orthogonal multiple access systems. Digit. Signal Process. 111 (2021)
Shengchen Wu, Haotong Cao, Haitao Zhao, Yue Hu, Longxiang Yang, Hao Yin, Hongbo Zhu
A softwarized resource allocation framework for security and location guaranteed services in B5G networks. Comput. Commun. 178 (2021)
Meng Zhou, Yao Zhang, Xu Qiao, Weiqiang Tan, Longxiang Yang
Analysis and Optimization for Downlink Cell-Free Massive MIMO System with Mixed DACs. Sensors 21 (8) (2021)
Haotong Cao, Jianbo Du, Haitao Zhao, Daniel Xiapu Luo, Neeraj Kumar, Longxiang Yang, F. Richard Yu
Resource-Ability Assisted Service Function Chain Embedding and Scheduling for 6G Networks With Virtualization. IEEE Trans. Veh. Technol. 70 (4) (2021)
Yao Zhang, Meng Zhou, Yulun Cheng, Longxiang Yang, Hongbo Zhu
RF Impairments and Low-Resolution ADCs for Nonideal Uplink Cell-Free Massive MIMO Systems. IEEE Syst. J. 15 (2) (2021)
Shuyi Wang, Haotong Cao, Longxiang Yang
A Survey of Service Function Chains Orchestration in Data Center Networks. GLOBECOM (Workshops) (2020)
Haotong Cao, Yue Hu, Shengchen Wu, Longxiang Yang
A Novel and Secure Service Function Chains Embedding Framework for NFV-Enabled Networks. WoWMoM (2020)
Yao Zhang, Haotong Cao, Meng Zhou, Xu Qiao, Shengchen Wu, Longxiang Yang
Cell-Free Massive MIMO with Few-bit ADCs/DACs: AQNM versus Bussgang. VTC Spring (2020)
Haotong Cao, Shengchen Wu, Yue Hu, Feng Tian, Longxiang Yang
Secure Virtual Resource Allocation in Heterogeneous Networks for Intelligent Transportation. VTC Spring (2020)
Haotong Cao, Yue Hu, Shengchen Wu, Jianbo Du, Feng Tian, Gagangeet Singh Aujla, Longxiang Yang
NoViSec: Novel Virtual Network Mapping Framework for Secure Software-Defined Networking. WCNC Workshops (2020)
Xuebing Bai, Meng Zhou, Xu Qiao, Yao Zhang, Longxiang Yang
Uplink Performance Analysis of Cell-Free MIMO with Low-Resolution ADCs and ZF Receiver. ICACT (2020)
Haotong Cao, Shengchen Wu, Yue Hu, Ravinder Singh Mann, Yun Liu, Longxiang Yang, Hongbo Zhu
An Efficient Energy Cost and Mapping Revenue Strategy for Interdomain NFV-Enabled Networks. IEEE Internet Things J. 7 (7) (2020)
Yao Zhang, Meng Zhou, Haotong Cao, Longxiang Yang, Hongbo Zhu
On the Performance of Cell-Free Massive MIMO With Mixed-ADC Under Rician Fading Channels. IEEE Commun. Lett. 24 (1) (2020)
Haotong Cao, Shengchen Wu, Yue Hu, Gagangeet Singh Aujla, Longxiang Yang
Virtual Resource Allocation for Tactile and Flexible Services in UAVs-Integrated 5G Networks. ICC (2020)
Yao Zhang, Meng Zhou, Haotong Cao, Yun Liu, Longxiang Yang, Hongbo Zhu
Joint resource optimisation in cell-free massive MIMO with low-resolution ADCs. IET Commun. 14 (12) (2020)
Xuebing Bai, Lingtao Zhou, Meng Zhou, Xu Qiao, Yao Zhang, Longxiang Yang
Sum-Rate Maximization in Cell-Free Massive MIMO with Low-Resolution ADCs and ZF Receiver. ICCT (2020)
Yulun Cheng, Jun Zhang, Longxiang Yang, Chenming Zhu, Hongbo Zhu
Joint Multioperator Virtual Network Sharing and Caching in Energy Harvesting-Aided Environmental Internet of Things. IEEE Internet Things J. 7 (8) (2020)
Shengchen Wu, Yue Hu, Longxiang Yang
Soft-Sec-Loc: A Softwarized Resource Allocation Framework for Guaranteed Security and Location. GLOBECOM (Workshops) (2020)
Neeraj Kumar, Tanya Dhand, Anish Jindal, Gagangeet Singh Aujla, Haotong Cao, Longxiang Yang
An Edge-Fog Computing Framework for Cloud of Things in Vehicle to Grid Environment. WoWMoM (2020)
Haotong Cao, Ailing Xiao, Yue Hu, Peiying Zhang, Shengchen Wu, Longxiang Yang
On Virtual Resource Allocation of Heterogeneous Networks in Virtualization Environment: A Service Oriented Perspective. IEEE Trans. Netw. Sci. Eng. 7 (4) (2020)
Haotong Cao, Yue Hu, Qin Wang, Shengchen Wu, Longxiang Yang
A Blockchain-Based Virtual Network Embedding Algorithm for Secure Software Defined Networking. INFOCOM Workshops (2020)
Yao Zhang, Meng Zhou, Haotong Cao, Longxiang Yang, Hongbo Zhu
Sum-rate maximization in uplink cell-free massive multiinput multioutput system with jamming. Trans. Emerg. Telecommun. Technol. 31 (9) (2020)
Haotong Cao, Shengchen Wu, Gagangeet Singh Aujla, Qin Wang, Longxiang Yang, Hongbo Zhu
Dynamic Embedding and Quality of Service-Driven Adjustment for Cloud Networks. IEEE Trans. Ind. Informatics 16 (2) (2020)
Haotong Cao, Hongbo Zhu, Longxiang Yang
Collaborative attributes and resources for single-stage virtual network mapping in network virtualization. J. Commun. Networks 22 (1) (2020)
Yulun Cheng, Jun Zhang, Longxiang Yang, Chenming Zhu, Hongbo Zhu
Distributed Green Offloading and Power Optimization in Virtualized Small Cell Networks With Mobile Edge Computing. IEEE Trans. Green Commun. Netw. 4 (1) (2020)
Xu Qiao, Yao Zhang, Meng Zhou, Longxiang Yang
Alternating Optimization Based Hybrid Precoding Strategies for Millimeter Wave MIMO Systems. IEEE Access 8 (2020)
Hui Zhang, Shu Liu, Longxiang Yang, Hongbo Zhu
Energy efficient resource matching algorithm for multi-homing services in dynamic wireless environment. Wirel. Networks 26 (2) (2020)
Meng Zhou, Yao Zhang, Xu Qiao, Longxiang Yang
Spatially Correlated Rayleigh Fading for Cell-Free Massive MIMO Systems. IEEE Access 8 (2020)
Dong Hu, Yao Zhang, Haotong Cao, Meng Zhou, Longxiang Yang
Energy-Efficient Transmission Design for Downlink Non-Orthogonal Multiple Access Network. ICCE-TW (2019)
Yao Zhang, Haotong Cao, Longxiang Yang
Max-Min Power Optimization in Multigroup Multicast Cell-Free Massive MIMO. WCNC (2019)
Haotong Cao, Yongan Guo, Shengchen Wu, Zhicheng Qu, Hongbo Zhu, Longxiang Yang
Location Aware and Node Ranking Value Driven Embedding Algorithm for Multiple Substrate Networks. ICC (2019)
Ying Zhou, Lihua Yang, Longxiang Yang, Meng Ni
Novel Energy-Efficient Data Gathering Scheme Exploiting Spatial-Temporal Correlation for Wireless Sensor Networks. Wirel. Commun. Mob. Comput. 2019 (2019)
Yao Zhang, Haotong Cao, Meng Zhou, Longxiang Yang
Cell-free massive MIMO: Zero forcing and conjugate beamforming receivers. J. Commun. Networks 21 (6) (2019)
Meng Zhou, Mangang Xie, Yao Zhang, Xiangdong Jia, Longxiang Yang
Safeguarding Non-Best User Association Aided 5G K-Tier HetNets Using Physical Layer Security. VTC Spring (2019)
Xiangdong Jia, Wenjuan Xu, Qiaoling Fan, Longxiang Yang
Conditional dual-connectivity decoupling design framework for OMA and NOMA heterogeneous networks and performance comparison. IET Commun. 13 (13) (2019)
Xu Qiao, Yao Zhang, Haotong Cao, Zhiqian Xu, Longxiang Yang
Hybrid Precoders and Combiners for Sub- Connected and Fully Connected Structures. ICCE-TW (2019)
Xu Qiao, Yao Zhang, Meng Zhou, Haotong Cao, Longxiang Yang
Eigen Decomposition-Based Hybrid Precoding for Millimeter Wave MIMO Systems With Low-Resolution ADCs/DACs. WCSP (2019)
Haotong Cao, Shengchen Wu, Yao Zhang, Meng Zhou, Longxiang Yang, Hongbo Zhu
Quality of Service Assisted Mapping Strategy in Virtualization Environment. ICCC (2019)
Yao Zhang, Haotong Cao, Meng Zhou, Longxiang Yang
Power Optimization for Energy Efficiency in Cell-Free Massive MIMO with ZF Receiver. ICACT (2019)
Zhiqian Xu, Yao Zhang, Xu Qiao, Haotong Cao, Longxiang Yang
Energy-Efficient Offloading and Resource Allocation for Multi-Access Edge Computing. ICCE-TW (2019)
Yao Zhang, Meng Zhou, Xu Qiao, Haotong Cao, Longxiang Yang
On the Performance of Cell-Free Massive MIMO With Low-Resolution ADCs. IEEE Access 7 (2019)
Haotong Cao, Shengchen Wu, Feng Tian, Longxiang Yang
Efficient Virtualized Resources Allocation in Network Virtualization Environment: A Service Oriented Perspective. WCSP (2019)
Yao Zhang, Haotong Cao, Meng Zhou, Longxiang Yang
Spectral Efficiency Maximization for Uplink Cell-Free Massive MIMO-NOMA Networks. ICC Workshops (2019)
Yao Zhang, Haotong Cao, Meng Zhou, Xu Qiao, Longxiang Yang
Rate Analysis of Cell-Free Massive MIMO with One-Bit ADCs and DACs. PIMRC (2019)
Jinbo Chen, Haotong Cao, Longxiang Yang
NFV MANO Based Network Slicing Framework Description. ICCE-TW (2019)
Yao Zhang, Haotong Cao, Meng Zhou, Shengchen Wu, Longxiang Yang
Rate Maximization for Cell-Free Massive MIMO with Low-Resolution ADCs. DASC/PiCom/DataCom/CyberSciTech (2019)
Meng Zhou, Yao Zhang, Haotong Cao, Xu Qiao, Longxiang Yang
Enhanced Power Allocation Algorithms for Uplink Mixed ADCS Massive MIMO Systems. GLOBECOM Workshops (2019)
Meng Zhou, Yao Zhang, Haotong Cao, Dong Hu, Longxiang Yang
Max-Min Fairness for Uplink Massive MIMO Systems with Low-Resolution ADC. ICCE-TW (2019)
Xiangdong Jia, Qiaoling Fan, Wenjuan Xu, Longxiang Yang
Cross-Tier Dual-Connectivity Designs of Three-Tier Hetnets With Decoupled Uplink/Downlink and Global Coverage Performance Evaluation. IEEE Access 7 (2019)
Haotong Cao, Shengchen Wu, Yongan Guo, Hongbo Zhu, Longxiang Yang
Mapping strategy for virtual networks in one stage. IET Commun. 13 (14) (2019)
Yao Zhang, Haotong Cao, Shengchen Wu, Meng Zhou, Longxiang Yang
Max-Min Fairness for Cell-Free Massive MIMO with Low-Resolution ADCs. GCCE (2019)
Yan Li, Yao Zhang, Longxiang Yang
Power Control Strategy for User-Centric in Cell-Free Massive MIMO. ICCE-TW (2019)
Yue Hu, Haotong Cao, Shengchen Wu, Feng Tian, Longxiang Yang
A Study on Service Oriented Resource Allocation in Virtualization Environment. GCCE (2019)

Longxiang Yang.css-eqlu8i{font-size:small;padding-left:4px;}

Publication Activity (10 Years)

Top Topics

Top Venues

Longxiang Yang