Article
Engineering, Electrical & Electronic
Sachitha Kusaladharma, Wei-Ping Zhu, Wessam Ajib, Gayan Amarasuriya Aruma Baduge
Summary: This paper investigates the throughput improvement of cell-free massive MIMO systems using NOMA, with node locations modeled using Poisson point processes and matched-filter-based precoding employed. The study finds that NOMA can significantly increase average rates under low path loss exponents and dense networks, with user fairness boosted by proper parameter selection.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Telecommunications
Zheng Shi, Hong Wang, Yaru Fu, Guanghua Yang, Shaodan Ma, Xinrong Ye
Summary: This paper investigates the performance improvement of small cell networks by integrating MIMO and NOMA considering imperfect CSI. The study reveals that average outage probabilities are independent of BS intensity but must be restricted to achieve low outage probabilities as channel uncertainty decreases. Additionally, highly correlated estimation errors can improve outage performance under low CSI quality.
CHINA COMMUNICATIONS
(2021)
Article
Telecommunications
Zhihui Shang, Tao Zhang, Guojie Hu, Yueming Cai, Weiwei Yang
Summary: This letter explores the secure transmission issue in NOMA based cognitive radio networks with imperfect CSI. The proposed scheme aims to achieve good security and reliability performance, but there is a trade-off between the two indicators. Simulation results demonstrate that FD-NOMA operation outperforms HD-NOMA and HD-OMA in terms of EST.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Mohannad H. Al-Ali, Walid A. Al-Hussaibi
Summary: This article analyzes the ergodic sum rate (ESR) of uplink MIMO-NOMA networks under spatially correlated channels and imperfect CSI. Closed-form lower bounds for the ESR are provided, with simplified formulas in the high SNR regime. Numerical results validate the accuracy of the derived expressions.
IEEE SYSTEMS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Wessam M. Salama, Moustafa H. Aly, Eman S. Amer
Summary: This paper investigates the improvement of BER performance in MIMO systems using NOMA-VLC. Two modulation techniques, OOK and L-Pulse Position Modulation, are used with different scenarios and user counts. The authors propose a framework with two stages: data collection in MATLAB and training/testing of deep learning models (DLMs). The results show the superiority of ResNet50V2 over InceptionResNetV2 in different cases and for all users. The BER performance is also studied with different DL techniques and compared with previous results to show better performance.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Nibedita Nandan, Sudhan Majhi, Hsiao-Chun Wu
Summary: Physical layer security (PLS) is crucial in 5G wireless technology, particularly in the context of non-orthogonal multiple-access (NOMA) for spectrum sharing among multiple users. This study proposes a transmit-zero-forcing beamforming (ZFBF) technique with signal alignment to enhance PLS for MIMO-NOMA based cognitive radio networks, when perfect channel state information (CSI) is available at the base station (BS). Additionally, an eigen beamforming technique is introduced to improve PLS in the presence of imperfect CSI, with both techniques utilizing power allocation algorithms for further enhancement.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Hardware & Architecture
Yanlin Deng, Quanzhong Li, Qi Zhang, Liang Yang, Jiayin Qin
Summary: This paper investigates secure beamforming design in IoT networks to protect information from eavesdropping, maximizing achievable secrecy sum rate subject to constraints of interference cancellation and transmit power. It proposes optimization algorithms based on perfect CSI and robust design algorithms when perfect CSI is not available. The effectiveness of the algorithms is verified through simulation results.
Article
Engineering, Electrical & Electronic
Wen Wang, Wanli Ni, Hui Tian, Zhaohui Yang, Chongwen Huang, Kai-Kit Wong
Summary: This paper investigates the use of a reconfigurable dual-functional surface, namely the STAR-RIS, in NOMA networks to ensure secure transmission across the entire space. It explores three practical operating protocols, energy splitting, mode selection, and time splitting, to safeguard the downlink communication from the base station to the legitimate users in the presence of eavesdroppers. The joint optimization of power allocation, active and passive beamforming is studied to maximize the secrecy energy efficiency, considering imperfect channel state information. Simulation results show that the proposed STAR-RIS assisted NOMA networks outperform conventional RIS counterparts in terms of SEE, and the choice of protocol depends on the power domain and the accuracy of CSI estimation and bit resolution power consumption are crucial factors.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2022)
Article
Computer Science, Information Systems
Ahmed Al Amin, Soo Young Shin
Summary: In this letter, NOMA is integrated with OAM-MIMO and OAM-IM to improve downlink channel capacities for multiple users. Simulation results demonstrate that the proposed scheme outperforms conventional schemes in terms of both individual user and sum channel capacities.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Thai-Hoc Vu, Toan-Van Nguyen, Quoc-Viet Pham, Daniel Benevides da Costa, Sunghwan Kim
Summary: This paper studies the performance of UAV-aided short-packet NOMA systems under imperfect channel state information and successive interference cancellation. It provides closed-form expressions for various performance metrics and carries out an asymptotic BLER analysis for insights. Three optimization problems are formulated to minimize BLER, maximize throughput, and minimize AoI. Numerical results show the influence of ipCSI and the benefits of joint optimization.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2023)
Article
Computer Science, Information Systems
Vipul Dixit, Atul Kumar
Summary: This paper proposes a high-rate network solution with MIMO technology and NOMA-VLC system for a multi-user scenario, along with a detailed analysis of a practical scenario of imperfect SIC. The performance of the proposed multi-user MIMO-NOMA-VLC system outperforms the SISO-NOMA-VLC system with the same parameters.
Article
Engineering, Electrical & Electronic
Gangming Lyu, Yuning You, Ang Li, Xuewen Liao, Christos Masouros
Summary: This paper proposes a stochastic-robust constructive interference (CI) precoding scheme for downlink multi-user MISO systems, overcoming the challenges of imperfect channel state information (CSI). Through approximations and transformations, the stochastic CI problem is converted into convex constraints and second-order cone programming, showing improved performance over existing methods in terms of both transmit power and feasibility rate. Simulation results demonstrate the effectiveness of the proposed method in guaranteeing the desired CI probability under acceptable channel uncertainties.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Telecommunications
Mayank Gupta, Shankar Prakriya
Summary: This study proposes an optimal interference temperature limit (ITL) apportioning scheme based on channel state information (CSI) in a multiuser underlay uplink network, which maximizes throughput by controlling the transmit powers of users. The analysis includes the impact of NOMA/OMA switching, optimal user selection, and CSI based ITL apportioning on the uplink throughput performance, taking into account successive interference cancellation (SIC) errors, and derives useful performance bounds.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2022)
Article
Energy & Fuels
Mohamed Hassan, Manwinder Singh, Khalid Hamid, Rashid Saeed, Maha Abdelhaq, Raed Alsaqour
Summary: Cooperative non-orthogonal multiple access (NOMA) is a technology that addresses challenges in future wireless networks by providing a large amount of connectivity and system capacity. This paper proposes a design for distance and power location coefficients for far users in DL cooperative NOMA PD networks and evaluates their outage probability (OP) performance against SNR. The results show that increasing power location coefficients for far users can reduce OP rate, and DL cooperative NOMA outperforms NOMA in terms of OP performance. Furthermore, MIMO techniques and massive MIMO technology significantly improve OP performance.
Article
Computer Science, Information Systems
Israa Khaled, Charlotte Langlais, Ammar El Falou, Bachar A. Elhassan, Michel Jezequel
Summary: An angle-domain non-orthogonal multiple access (NOMA) scheme is proposed to enhance the performance of mmWave MU-MIMO system, utilizing angular-based performance metrics and methods. Numerical results show a significant improvement in system performance when the number of users is close to the number of antennas.
Article
Engineering, Electrical & Electronic
Zhiguo Ding, Robert Schober, Pingzhi Fan, H. Vincent Poor
IEEE TRANSACTIONS ON COMMUNICATIONS
(2019)
Article
Engineering, Electrical & Electronic
Kaidi Wang, Yuanwei Liu, Zhiguo Ding, Arumugam Nallanathan, Mugen Peng
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2019)
Article
Engineering, Electrical & Electronic
Jingjing Cui, Yuanwei Liu, Arumugam Nallanathan
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Jingjing Cui, Yuanwei Liu, Zhiguo Ding, Pingzhi Fan, Arumugam Nallanathan, Lajos Hanzo
IEEE VEHICULAR TECHNOLOGY MAGAZINE
(2020)
Article
Telecommunications
Zhiguo Ding, H. Vincent Poor
IEEE COMMUNICATIONS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Ximing Xie, Fang Fang, Zhiguo Ding
Summary: The combination of NOMA and IRS is proposed to enhance the energy efficiency of wireless communication systems. An alternating optimization based algorithm is introduced to minimize the transmit power in the multi-cluster NOMA network. Simulation results show that the proposed algorithm outperforms other schemes in terms of performance gain.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Yunus Dursun, Kaidi Wang, Zhiguo Ding
Summary: This study aims to maximize the secrecy sum rate (SSR) of a MIMO-NOMA uplink network under the constraints of maximum total transmit power and quality of service (QoS). The SSR of NOMA is compared with orthogonal multiple access and other algorithms using the generalized singular value decomposition method in different MIMO scenarios. The original problem is transformed into a suboptimal concave problem using a first order Taylor approximation due to the subtractive and non-convex nature of the SSR problem.
PHYSICAL COMMUNICATION
(2022)
Article
Engineering, Electrical & Electronic
Muhammad Norfauzi Dani, Daniel K. C. So, Jie Tang, Zhiguo Ding
Summary: This paper proposes a joint power allocation and subgrouping scheme to enhance the performance of multi-layer multicast systems using non-orthogonal multiple access (NOMA). By deriving power allocation techniques for different layers and formulating an optimization problem, the scheme successfully allocates power to each layer stream while maintaining minimum target rate and proportionality. Simulation results demonstrate the effectiveness of the proposed scheme in improving overall multicast rate performance and ensuring higher rates for the base layer stream.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Computer Science, Hardware & Architecture
Yunus Dursun, Muhammed Burak Goktas, Zhiguo Ding
Summary: Mobile edge computing (MEC) is a distributed computing paradigm that brings computing and data storage closer to the network's edge. This paper proposes a method that integrates NOMA, MIMO, and MEC technologies to minimize energy consumption during local computing, task offloading, and MEC computing in a MIMO uplink scenario. The proposed method achieves better energy performance than orthogonal multiple access (OMA) schemes, especially in 6G networks with large data sizes and stringent delay requirements.
Article
Telecommunications
Ximing Xie, Shiyu Jiao, Kaidi Wang, Zhiguo Ding
Summary: Introducing backscatter devices into a non-orthogonal multiple access (NOMA) network greatly improves spectrum efficiency, providing a promising solution for the combination of Internet of Things (IoT) and wireless networks. This letter investigates a BAC-NOMA network and formulates a sum-rate maximization problem, deriving a closed-form solution for the backscattering coefficient. The problem is then solved using a semi-definite relaxation (SDR) based algorithm and a learning based algorithm. Simulation results show that both algorithms have their own advantages and disadvantages, and should be chosen wisely based on the actual situation.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Telecommunications
Yunus Dursun, Fang Fang, Zhiguo Ding
Summary: This paper investigates the application of Non-orthogonal multiple access, multiple-input multiple-output, and mobile edge computing in the sixth generation communication networks, aiming to improve the performance of mobile edge computing by minimizing transmission delay.
CHINA COMMUNICATIONS
(2022)
Article
Telecommunications
Yunus Dursun, Fang Fang, Zhiguo Ding
Summary: This paper proposes a hybrid NOMA-MIMO-MEC system to improve the performance of MEC offloading by minimizing transmission delay. The delay minimization problem is solved using Dinkelbach transform and GSVD method. Simulation results show that the system achieves better delay performance and lower energy consumption compared to OMA.
CHINA COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Zhiguo Ding
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2020)
Article
Computer Science, Information Systems
Jingjing Cui, Zhiguo Ding, Yansha Deng, Arumugam Nallanathan, Lajos Hanzo
Article
Telecommunications
Yunus Dursun, Fang Fang, Zhiguo Ding
Summary: This paper focuses on minimizing transmission delay in the MIMO-MEC system to improve spectral efficiency, energy efficiency, and data rate of MEC offloading. The proposed Hybrid-NOMA-MIMO-MEC system demonstrates better delay performance and lower energy consumption compared to OMA.
CHINA COMMUNICATIONS
(2022)
