User pairing in noma. The system model is covered in Section 3.

User pairing in noma The dynamic uniform channel gain difference (DUCGD) user pairing technique plays an important role to maximize the capacity of all the paired and served users. Analysis of different MIMO-NOMA techniques based on different user pairing are explored in this paper. Section 2 is a survey of related works. Jul 9, 2018 · To solve this non-convex problem, we first obtain the optimal power allocation in an NOMA system with only 2 users; then analyze the user pairing problem in a simplified situation, i. NOMA allows multiple users transmit data using the same resource block simultaneously with proper user pairing. Aiming to maximize achievable sum rate and ensure the users' Quality-of-Service (QoS) requirements, we formulate an optimization problem which relies on reinforcement May 18, 2023 · In this paper, we propose an adaptive user pairing (AUP) scheme in multi-intelligent reflecting surface (IRS)-aided massive multiple-input multiple-output (MIMO)-non-orthogonal multiple access (NOMA) networks. In Sep 27, 2022 · While a NOMA user pairing scheme combined with the almost blank subframe (ABS) technology, and a dynamic NOMA power allocation scheme are presented to maximize the network fairness based on the optimized throughput of the edge users in . It presents the authoritative state-of-the-art results on capacity analysis, power allocation schemes, user fairness, and user-pairing schemes in NOMA (Xu et al. Dec 24, 2022 · The simulation results illustrate that the proposed user pairing strategies for cooperative NOMA and UAV-based cellular networks enhance downlink transmission performance and ensure optimum use of Sep 27, 2023 · In the recent times, non-orthogonal multiple access (NOMA) can be seen as a paradigm shift for next generations of communication networks such as the fifth generation (5G) and beyond 5G networks. Performance gains are attained when compared the proposed schemes with NOMA without user pairing and with Jul 1, 2023 · An adaptive user pairing scheme in multi-intelligent reflecting surface (IRS)-aided massive multiple-input multiple-output (MIMO)-non-orthogonal multiple access (NOMA) networks and a deep learning (DL) framework to predict the optimal solution of the precoding matrix, the phase shift of IRSs, and user pairing elements according to the user’s locations and channel gains is proposed. However, the formulated Motivated by these observations, for the work herein, we leaned upon a DRL algorithm to pair users and provide services with various delay QoS requirements for future NOMA-based satellite networks (since this paper’s aim was to pair users in delay-limited NOMA-based satellite networks with a DRL algorithm, while the impacts of low-density Massive connectivity and low latency are two important challenges for the Internet of Things (IoT) to achieve the Quality of Service (QoS) provisions required by the numerous devices it is designed to service. The base station divides the set of users into disjunct pairs and assigns the available resources to these pairs. In this letter, we explore user pairing in a downlink non-orthogonal multiple access (NOMA) network. In this paper, we propose a new method to achieve lower outage probability in millimeter wave -NOMA systems with massive multiple-input multiple-output (MIMO) structure. Compared to the user pairing strategies devel-oped in [18] and [19], our approach delivers effective user pairing solution using logarithmic barrier method in couple with closed-form optimal power allocation, hence achieving improved efficiency and accuracy. Firstly, the hard channel capacity and . The remainder sections are arranged in the following manner. To solve this non-convex problem, we NOMA systems, the achievable data rates are significantly dependent on the user pairing, and hence, while pairing the users in RIS-assisted NOMA systems, the network operator has to consider the imperfections in the phase compensation. In the considered NOMA network, a user with poor channel condition is paired with a user with good channel condition, when both their rate requirements are satisfied. A hybrid NOMA and orthogonal multiple access (OMA) scheme can be employed to accommodate multiple user pairs effectively. Sep 22, 2015 · In this paper, the impact of user pairing on the performance of two NOMA systems, i. the multiple users are divided into multiple two-user groups, where NOMA is employed within each group and OMA is employed for inter-group. Let's dive straight in! Download the MATLAB code here What is the user pairing problem in NOMA? We know that NOMA serves multiple users simultaneously in the same frequency. We derive the optimal power allocation that maximizes the sum secrecy rate while guaranteeing to each user a target secrecy rate. Efficient user pairing between multiple users is needed to enhance the capacity of uplink NOMA systems, and this paper investigates a user pairing strategy that In this paper, a downlink non-orthogonal multiple access (NOMA) network is studied. Compared to orthogonal multiple access techniques, NOMA offers extra benefits, including greater spectrum efficiency which is provided through multiplexing users in the transmission power domain while using the same spectrum Zhang et al. The focal point of this work is to explore the effects of UPPA on capacity and bit error rate (BER) of NOMA users, thereby understanding the tradeoffs involved when UPPA is performed. In this This study investigates user pairing strategies in a NOMA-assisted cell-free massive MIMO system. Many researchers have already investigated user pairing or power allocation in MIMO-NOMA systems [6,7,8,9,10,11,12]. To improve SE, the UEs were sorted by fading channel strength and then given the best resource allocation. The authors propose an adaptive user pairing (A-UP) algorithm for enhancing the sum-rate performance of the paired Jan 1, 2020 · Non-orthogonal multiple access (NOMA) configuration is a good nominee to accommodate with MIMO structure to fulfil the demands to extra user data rates and enriched spectral efficiencies. First, the optimal solution of power control for a user pair is obtained under different decoding orders, where closed-form expressions and a low-complexity algorithm Mar 20, 2018 · User pairing in Non-Orthogonal Multiple-Access (NOMA) uplink is investigated considering some predefined power allocation schemes. Nevertheless, the computational intricacy of this algorithm is high. As power allocation inherently intertwines with user pairing, a joint user pairing and power Dec 13, 2020 · For a practical dowlink NOMA system with imperfect successive interference cancellation (SIC), we derive bounds on channel coefficients and power allocation factors between NOMA users to achieve higher rates than an equivalent orthogonal multiple access (OMA) system. We first relax the binary constraints and adopt sequential convex Apr 1, 2019 · Results show that the performance of the NOMA system with the proposed optimal user pairing is significantly better than that of the OMA system, as well as the performance with random user pairing. Through dividually selecting the first user and the second user for each user pair, the proposed Non-orthogonal multiple access (NOMA) is consid-ered an important candidate for the next-generation cellular networks to address the issue of exponentially growing data traffic from technologies like the Internet of Things (IoT). However, if this constraint in (15) is not satisfied, then pairing such users may not be beneficial. Jan 27, 2022 · This paper provides a comprehensive framework to analyze the performance of non-orthogonal multiple access (NOMA) in the downlink transmission of a single-carrier and multi-carrier terahertz (THz) network. 2021). in [27] investigated a distance-based user pairing in the C-NOMA network, where the locations of the source and typical user are fixed, and the candidate users for pairing follow the distribution of homogeneous Poisson Point Pro-cess, and two close-to-user pairing and close-to-source pairing schemes were proposed. This study endeavors to examine the problem of user pairing (UP) in a downlink NOMA framework. We consider the Nov 13, 2020 · A new subcarrier-user allocation algorithm for the downlink non-orthogonal multiple access system is presented in this paper. In the AUP scheme, two users with different channel conditions are selected for user pairing while multiple IRSs assist to improve received signal quality at users. This paper investigates the problem of user pairing in multi-carrier non-orthogonal multiple access (MC-NOMA) systems. One of the key issues then is user pairing, which must be done in order to maximize the network capacity. The proposed approach relies on first constructing a conflict graph corresponding to all possible user pairings and then reformulating the problem of finding the best user pairs as that of finding the maximum weighted Mar 20, 2018 · User pairing in non-orthogonal multiple-access (NOMA) uplink is investigated considering some predefined power allocation schemes. Jan 21, 2024 · Non-orthogonal multiple access-unmanned aerial vehicles (NOMA-UAV) are the enabling technologies for 5G network in increasing the spectral efficiency as well as enhancing the computing capability for the massive machine type communication (mMTC) devices. We formulate maximizing the utility function Sep 8, 2022 · In this letter, we analyze the performance of the intelligent reflecting surface (IRS) assisted downlink non-orthogonal multiple access (NOMA) systems in the presence of imperfect phase compensation. For a practical downlink NOMA system with imperfect successive interference cancellation (SIC), we derive bounds on power allocation factors and formulate a minimum signal-to-interference-plus-noise ratio (SINR) difference criterion for NOMA pair In this paper, we investigate the user pairing and power allocation scheme for multiple cellular users (CUs) under the downlink non-orthogonal multiple access (NOMA) system. To acheive these objectives, reconfigurable intelligent surface (RIS), terahertz (THz) communication, and user pairing nonorthogonal multiple access (NOMA) have been recognized as key enabling technologies. In , a joint user pairing and power allocation scheme in virtual MIMO systems was proposed. In particular, we study the joint NOMA power allocation, user pairing, and UAV deployment (placement) for this wireless system. provide some insights for the CR-NOMA user pairing study. Furthermore, we show that optimal user pairing in uplink can be implemented using some algorithms with polynomial time complexity. Multiple users can be served within the same orthogonal domains in NOMA via power-domain multiplexing, whilst CR allows The proposed adaptive user pairing (A-UP) algorithm results in better performance than state-of-the-art NOMA pairing algorithms in the presence of SIC imperfections and is proposed for achieving better user rates. The system model is covered in Section 3. However, due to the nonconvex property of the formulated problem In this paper, we propose a dynamic graph-theoretical solution, aiming to minimize the average Age of Information, to the user pairing problem in cellular networks employing non-orthogonal multiple access with variable user rate demands. Each base station has multiple orthogonal physical resource blocks (PRBs). May 27, 2022 · The motivations for deploying energy and spectral-efficient network architectures are the high energy consumption and the need for more spectral resources in modern cellular networks. How-ever, the consideration of other NOMA pairs would not effect the performance of users in a specific NOMA pair. , NOMA with fixed power allocation (F-NOMA) and cognitive-radio-inspired NOMA (CR-NOMA), is characterized. Firstly, in the case of two-user This paper investigates the problem of user pairing in multi-carrier non-orthogonal multiple access (MC-NOMA) systems and makes a useful exploration on the use of MADRL to solve the resource allocation problems in communication systems. The simulation results for near-near (N-N) and near-far (N-F) user pairing shames have been provided. In the works [12–14], the op- Oct 5, 2022 · The integration of cognitive radio (CR) into power domain non-orthogonal multiple access (NOMA) wireless systems has been envisioned as a promising paradigm for supporting massive energy-efficient beyond fifth-generation (B5G)-based IoT connectivity. Hemanta Kumar and others published RIS-assisted User Pairing NOMA System for THz Communications | Find, read and cite all the research you need on ResearchGate approaches were developed and dedicated to user pairing, respectively. This paper investigates the sum rate maximization problem for NOMA system over a frequency selective fading channel with its users being paired according to their channel powers. In this study, we examine user pairing in NOMA strategy for multiple-input multiple-output (MIMO) users. , a NOMA Jun 25, 2019 · Simulation results demonstrate that the NOMA techniques, basic principles, and double-objective optimization problem can not only approach the throughput performance compared with the global optimal search and the classical water-filling power allocation using matching theory but also can improve the fairness of the users. In this context, channel gains of paired users and their PA factors are varied to comprehensively analyze the dynamics of UP and PA in the context of individual and sum capacity In 6G wireless communication systems, Nonorthogonal multiple access (NOMA) can solve the problem of extra consumption power and bandwidth to enhance the spectral-efficiency (SE) of the system. Dec 8, 2014 · In this paper, the impact of user pairing on the performance of two NOMA systems, NOMA with fixed power allocation (F-NOMA) and cognitive radio inspired NOMA (CR-NOMA), is characterized. The base station divides the set of users into disjunct pairs The integration of intelligent reflecting surface (IRS) to multiple access networks is a cost-effective solution for boosting spectrum/energy efficiency and enlarging network coverage/connections. Mar 1, 2022 · An illustration of user pairing problem in NOMA, considering two users in each pair. Jiang et al. Considering the geometric distance between nodes, close-to-user pairing (CUP) and close-to-source pairing (CSP) schemes The integration of intelligent reflecting surface (IRS) to multiple access networks is a cost-effective solution for boosting spectrum/energy efficiency and enlarging network coverage/connections. In this paper, we investigate the spectrum resource and power In this paper, the non-orthogonal multiple access (NOMA) principle is applied to reuse existing beams to serve additional far users, in the premise of a multi-antenna BS has designed the precoding for near users in an existing space division multiple access (SDMA) network. We propose an adaptive user pairing (A-UP) algorithm for NOMA systems. To support mMTC devices, machine learning (ML) based algorithms can efficiently exploit the user pairing (UP) scheme for NOMA-UAV system. As power allocation inherently intertwines with user pairing, a joint user pairing and power allocation problem is considered to optimize the achievable sum rate (ASR) with minimum rate constraint for each user, which is a mixed integer programming problem. what motivates this paper. INTRODUCTION Non-orthogonalmultiple access (NOMA) has recently been considered as a promising technology for future mobile net-works [1]–[3]. This is particularly true when technologies, such as non-orthogonal multiple access (NOMA), are used, making it possible for users to access each other's data. To enhance the spectral efficiency of non-orthogonal multiple access (NOMA) in massive multiple input multiple output systems, we propose of user pairing on the sum rate and the individual user rates achieved by F-NOMA is investigated. Non-orthogonal multiple access (NOMA) has been recognized as a key driving technology for the fifth generation (5G) and beyond 5G cellular networks. This user pairing strategy is so-called traditional NOMA user pairing. Knowing that C-NOMA uses the channel gain difference and the power allocation to increase the data rate of the pair, in a dense user environment, this channel gain difference narrows further. I. Azam et al. Multiple-input multiple-output (MIMO) NOMA system can be Feb 13, 2020 · In this letter, we propose two novel, yet efficient, user pairing schemes for non-orthogonal multiple access (NOMA) in 3D visible light communication (VLC). Aug 25, 2017 · In this paper, we study the user pairing in a downlink non-orthogonal multiple access (NOMA) network, where the base station allocates the power to the pairwise users within the cluster. Moreover, while the conventional schemes required a high computational complexity to determine the user pairing and power allocation in a MIMO-NOMA system, we find the user pairing and power allocation at the same time with low computational complexity. Two-user uplink NOMA network. We investigate the problem of jointly optimizing user pairing and beam-forming design to maximize the minimum rate among all users. This is particularly true when technologies, such as nonorthogonal multiple access (NOMA), are used, making it possible for users to access each other’s data. (4) the joint user pairing for NOMA and beamforming design of Multi-STAR-RISs in an indoor environment. In NOMA, UP and PA serve as critical factors to achieve high performance gains. Non-orthogonal multiple access (NOMA) guarantees good spectral efficiency and better enhance Jul 6, 2017 · User pairing in Non-Orthogonal Multiple-Access (NOMA) uplink based on channel state information is investigated considering some predefined power allocation schemes. Specifically, we first develop a novel user pairing scheme for the THz-NOMA network which ensures the performance gains of NOMA over orthogonal multiple access (OMA) for each individual user Jul 3, 2024 · In this paper, we consider a downlink communication and sensing system where cooperative non-orthogonal multiple access (C-NOMA) is adopted as a multiple access technique to jointly provide communication functionality to a set of users and sensing functionality to targets. Section 2 establishes the system and network model, including the system model and Nov 13, 2020 · Despite the promising high-data rate features of visible light communications (VLC), they still suffer from unbalanced services due to blockages and channel fluctuation among users. In [11], the user pairing NOMA system is investigated for a maximum of two users. With fixed locations of the source and typical user, the candidate users for pairing follow homogeneous Poisson point process. To maximize the sum-rate of all CUs, we formulate the resource allocation issue through optimizing the user pairing relationship and power allocation method. Using this bound, we propose an adaptive user pairing algorithm to maximize the The fifth generation (5G) wireless communication systems promise to provide massive connectivity over the limited available spectrum. However, as far as we are aware, how to improve α- Fairness based power allocation for a 2-user pair in the downlink NOMA system. Specifically, a common signal is generated at the base station (BS) and transmitted with the users' private signals. The proposed approach is based on first constructing a conflict graph corresponding to all possible user pairings and then reformulating the problem of In this paper, a user pairing scheme based on power boosting is proposed for NOMA systems, which enables users with similar channel gains to get paired and obtain NOMA advantage. The base station divides the set of users into disjunct pairs and Jul 6, 2022 · In this work, we study the joint optimization of multiple unmanned aerial vehicles (UAVs)’ trajectories, power allocation, user-UAV association, and user pairing for UAV-assisted wireless networks employing the nonorthogonal multiple access (NOMA) for uplink communications. In this paper, we propose a In the Internet of Things (IoT), massive sensitive and confidential information is transmitted wirelessly, making security a serious concern. This article studies secure communications in multiuser NOMA downlink systems, where each 2Our framework can be generalized for multiple users by making multiple two-user NOMA pairs in orthogonal time/frequency resource blocks. We propose a many-to For a given pair of two users, if γs − γw > ∆MSD then we can pair them as NOMA users. We obtain a Aug 9, 2023 · In this paper, we investigate a user pairing problem in power domain non-orthogonal multiple access (NOMA) scheme-aided satellite networks. One pair includes a near user and a far user, whose signals are superposed at the transmitter side, and successive interference cancellation (SIC) is Jul 26, 2023 · Moreover, we propose a hybrid NOMA and OMA scheme for VLC according to two user pairing guidelines. Let us consider the achievable rate of a NOMA user as R k, m NOMA = log 2 (1 + Jul 6, 2017 · User pairing in Non-Orthogonal Multiple-Access (NOMA) uplink based on channel state information is investigated considering some predefined power allocation schemes. Specifically, the same beam serves three users, including the existing near user and two far users to be selected. Sep 12, 2022 · To solve this non-convex problem, we first obtain the optimal power allocation in a NOMA system with only 2 users; then analyze the user pairing problem in a simplified situation, i. However, due to the new capability of IRS in reconfiguring the wireless propagation channels, it is fundamentally unknown which multiple access scheme is superior in the IRS-assisted wireless network May 28, 2023 · This work proposes the utilization of the quantum approximate optimization algorithm (QAOA) for user pairing in non-orthogonal multiple access (NOMA). The proposed approach maximizes the network sum rate by judiciously pairing UE with distinct channel gains and assigning RISs to proper clusters. In the proposed system, all users are divided into multiple user pairs, where the near user who can receive the visible light signal directly would help forward the Apr 15, 2022 · In this paper, we consider a non-orthogonal multiple access (NOMA) system with coordinated multi-point (CoMP), which is used in 5G cellular networks to guarantee the rate requirements from the different edge users. It is Although,user pairing and power allocation for NOMA uplink have been studied previously,to the best of our knowledge there is no analytical performance evaluation for optimum user pairing in NOMA uplink. Given the importance of uplink NOMA in uncoordinated massive access in future networks, we investigate user pair- Two efficient user-pairing algorithms for NOMA in VLC are presented, aiming to enhance achievable data rates effectively and demonstrate the superiority of NOMA in comparison to OFDMA. Mar 29, 2021 · This is NP-hard to estimate the best performance values for all users on a particular NOMA system subchannel. In the considered scenario, different satellite applications are assumed with various delay quality-of-service (QoS) requirements, and the concept of effective capacity is employed to characterize the effect of delay QoS limitations on achieved performance Jul 9, 2018 · In this paper we explore user pairing in a downlink non-orthogonal multiple access (NOMA) network. We derive an upper bound on the imperfect phase compensation to achieve minimum required data rate for each user. Owing to its remarkable benefits, even NOMA has been employed for the sixth generation (6G) systems as well. 1. These techniques offer high spectral efficiency by allowing multiple users to communicate on the same user in the pair computed as in [15], ˆγb,m s is the SINR of the strong user with perfect SIC after NOMA pairing, Pb,m is the total power assigned to the pair, gb,m s is the channel gain of the strong user as in (2), P ˆb∈B\b Pˆb,mgˆb,m s is the aggregate interference received from other BSs, ˆγb,m w is the SINR of the weak user after Jul 30, 2021 · Non-orthogonal multiple access (NOMA) along with cognitive radio (CR) have been recently configured as potential solutions to fulfill the extraordinary demands of the fifth generation (5G) and beyond (B5G) networks and support the Internet of Thing (IoT) applications. And, the traditional NOMA user pairing mode may cause the pairing problem of the average channel gain users located between the cell center and cell edge users . May 1, 2022 · In this paper we present a comprehensive overview of user pairing and power allocation techniques for NOMA-based VLC systems. This paper introduces and evaluates a new transmission scheme which adopts cooperative non-orthogonal multiple access (Co-NOMA) in hybrid VLC/radio-frequency (RF) systems, so as to improve both system sum-rate and May 4, 2019 · This means that cell center users (better channel gain) should be paired with cell edge users (poor channel gain). Moreover, an improved-QAOA is proposed to further enhance the performance by reducing the number In this paper, we investigate the integration of the Non-Orthogonal Multiple Access (NOMA) technology into the Unmanned Aerial Vehicle (UAV)-based wireless system. Then, we formulate the optimization problem with the objective of maximizing the total throughput of mobile users (MUs) by jointly optimizing the decoding order, user pairing, active beamforming, and passive Joint User Pairing and Power Allocation With Compressive Sensing in NOMA Systems A Nasser, O Muta, H Gacanin, M Elsabrouty IEEE Wireless Communications Letters 10 (1), 151-155 , 2020 Fair User Pairing for NOMA Systems KEN LONG 1 , PENGYU WANG , WEI LI 1 , DEJIAN CHEN 1 School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications Dec 1, 2017 · A fast user pairing and power allocation algorithm considering proportional fairness is proposed in [21]. Jan 24, 2020 · The integration of intelligent reflecting surface (IRS) to multiple access networks is a cost-effective solution for boosting spectrum/energy efficiency and enlarging network coverage/connections. e. The design aims to minimize the total energy consumption of ground users while guaranteeing to successfully transmit This study investigates user pairing strategies in a NOMA-assisted cell-free massive MIMO system. Multiple-users can share the same bandwidth by using user pairing techniques (UPT) which superimposes their signals with different power levels. We focus on a user pairing system for NOMA with cooperative relaying cellular networks, in which access devices are separated into two groups and a unit pair is produced from each group. In this article, the harmony between non-orthogonal multiple access (NOMA) and rate-splitting (RS) is explored in a multi-antenna scenario, where a RS-NOMA system is proposed to implement dynamically transformation between these two transmission schemes. Most of the pairing schemes, however, require prior information, such as location information of the users Dec 11, 2020 · We consider user pairing and power allocation in MIMO-NOMA systems. User pairing to satisfy some system performance indicators, such as achievable sum rates and spectral efficiency, has been investigated in works such as [18,19,20,21]. beamforming, NOMA with random-pairing and heuristic-search strategies. In this paper, we answer the question how much performance improves if the users in NOMA uplink are paired optimally. Index Terms—Non-orthogonal multiple access (NOMA), beamforming, convex optimization, user pairing. Nov 21, 2017 · To enhance the spectral efficiency of non-orthogonal multiple access (NOMA) in massive multiple input multiple output systems, we propose a user pairing and pair scheduling algorithm, which can, simultaneously, pair the selected users and schedule suitable user pairs for data transmission. The idea behind this is to highlight the main characteristics of this PSO-based configuration for understanding how this policy enables the transmitter to require the In a multichannel NOMA system with a large number of users, the literature has shown that the best performance is achieved if no more than three users share a channel. We propose a security-enhanced user pairing scheme under the constraints of weak security to achieve high spectrum efficiency as well as weak system secrecy. In this paper, we investigate a non-orthogonal multiple access (NOMA)-aided ISAC system in which the ISAC base station (BS) serves multiple pairs of NOMA users with the same spectrum resources Non-orthogonal multiple access (NOMA) is a promising multiple access scheme for next generation wireless networks. Aug 14, 2024 · These papers particularly focused on power-domain NOMA which exploits superposition coding at the transmitter and successive interference cancellation at the receiver. First, power allocation was performed with known paired user groups Feb 11, 2023 · In the Internet-of-Things (IoT), massive sensitive and confidential information is transmitted wirelessly, making security a serious concern. [ 14 ] highlighted that pairing users with highly distinctive channel gains not only enhances system capacity but also maintains fairness in resource allocation. III. We In this letter, we explore user pairing in a downlink non-orthogonal multiple access (NOMA) network. But few writers focus on various services UEs’ associations with BSs. ADAPTIVE USER PAIRING (A-UP) In this paper, we investigate the joint user pairing and association problem for multicell non-orthogonal multiple access (NOMA) systems. 2. To enhance the spectral efficiency, the In this paper, we present a hybrid Visible Light Communication (VLC) and Radio Frequency (RF) based Non-Orthogonal Multiple Access (NOMA) system to extend the coverage of VLC and support multi-user communications at the same time. ADAPTIVE USER PAIRING (A-UP) Generally, user pairing in NOMA is based on the distance between the Base Station (BS) and the users, which may lead extra time consumption in measuring distance. Specifically, the quality of service for This paper focuses on user pairing (UP) and power allocation (PA) by considering an uplink Non-orthogonal multiple access (NOMA) system. We further extend our proposed algorithms to a generalized multi-radar sensing scenario. The remainder of this paper is organized as follows. Our analysis is carried out assuming different heights for the users' location as well as two dynamic power allocation strategies. A. For a practical downlink NOMA RL to determine the power of the UEs in each pair in the MIMO-NOMA system. , an NOMA system with four users. IV. Thus, the concept of user pairing has been developed,which divides users into multiple user pairs within a cell and every user pair is served with NOMA technique. By exploiting quantum concepts such as the quantum adiabatic theorem, a user pairing solution was derived that approximates a suboptimal sum rate. SYSTEM MODEL that the user pairing D/L NOMA with optimal resource allocation provides a much better SE than the conventional NOMA system. A hierarchical power allocation process is proposed, whereby the users are divided into two groups Mar 29, 2021 · In this paper, we investigate the user pairing and power allocation scheme for multiple cellular users (CUs) under the downlink non-orthogonal multiple access (NOMA) system. With this technology, all users can share same time or frequency resources and this improves data rate. Most research typically allocates two users to a channel. A random user pairing naturally leads to non-optimal performance, whereas an exhaustive search is unfavorable in practice due to high complexity. The combinatorial problem of user pairing to achieve the maximum sum rate is analyzed in the large system limit for In this paper the transmission security for multiuser multi-input single-output (MU-MISO)- Non-orthogonal multiple access (NOMA) downlink transmission is studied for untrusted users. In view of the aforementioned details, we present the following key contributions in this paper. Based on the China Family Panel Studies (CFPS) dataset, we use several learning algorithms to predict users’ rate requirements according to their profiles. Next, we utilize the MSD criterion in (15) for the adaptive NOMA user pairing algorithm. But how many users can we support in one frequency carrier? This paper proposes an exhaustive analysis of a particle swarm optimization (PSO)-based configuration applied in non-orthogonal multiple access (NOMA) systems in order to perform user aggregation along different sub-channels. In this paper, we propose a joint optimization of user pairing strategy with beamforming and power allocation to maximize the minimum downlink rate per Therefore, NOMA users should be categorized into distinct groups to balance implementation complexity and resource utilization . To this end, we consider the general problem of user pairing in NOMA uplink in a cellular network with some fixed power allocation schemes. Dec 7, 2024 · Sedaghat et al. Specifically, we first develop a novel user pairing scheme for the THz-NOMA network which ensures the performance gains of NOMA over orthogonal multiple access (OMA) for each individual user Feb 25, 2024 · The user pairing concept has been proposed to group users into multiple pairs with the aim of maximizing the channel gain difference among users, thereby enhancing the performance of NOMA. As power-domain NOMA exploits different power levels assigned to each user for Motivated by the above, we study the joint user pairing for NOMA and the beamforming design of Multi-STAR-RISs in an indoor environment. As power allocation inherently intertwines with user pairing, a joint user pairing and power For a given pair of two users, if γs − γw > ∆MSD then we can pair them as NOMA users. In order to maximize the achievable sum rate, a permutation-based genetic algorithm with low complexity is proposed to optimize user pairings in the hybrid NOMA and OMA scheme. The key method to solve the energy efficiency EE maximization problem of the downlink non-orthogonal multiple access (NOMA)-based massive MIMO system is to decouple it into user pairing and efficient power The main characteristic of the next-generation wire-less communications are seamless connectivity, large bandwidth, and high spectral and energy efficiencies. Finally, extensive simulation results validate that the proposed adaptive resource scheduling algorithm greatly improves network throughput while strictly maintaining buffer stability. We consider a scenario where the user equipments (UEs) are located in a multicell network equipped with multiple base stations. In this paper, we investigate the user pairing schemes for NOMA-enabled backscatter communication network. The base station divides the set of users into disjunct pairs and Nov 5, 2024 · Based on the obtained user pairing strategy, a corrective beamforming scheme is devised. However, due to the new capability of IRS in reconfiguring the wireless propagation channels, it is fundamentally unknown which multiple access scheme is superior in the IRS-assisted wireless network Dec 29, 2020 · Hello everyone! In this post, we'll look at the user pairing problem in NOMA. Since the successful decoding of high channel gain users can significantly improve the system performance, to make more high channel gain users be decoded successfully, we propose a pairing scheme, M-UPS, which is based on the user channel gain difference. Impact of user pairing on the sum rate In this subsection, we focus on how user pairing affects the probability that NOMA achieves a lower sum rate than conventional MA schemes, which is given by P(Rm +Rn < R¯m +R¯n). Feb 23, 2023 · Download Citation | On Feb 23, 2023, M. We investigate the problem of jointly optimizing user pairing and beamforming design to maximize the minimum May 1, 2018 · It is shown that for the considered power allocation scheme, random and optimum user pairing perform similarly in the large system limit, but optimum pairing is significantly better in finite dimensions. User pairing in non-orthogonal multiple-access (NOMA) uplink is investigated considering some predefined power allocation schemes. User pairing in Non-Orthogonal Multiple-Access (NOMA) uplink based on channel state information is investigated considering some predefined power allocation schemes. This paper studies secure communications in multiuser NOMA downlink systems, where each user Jun 1, 2020 · This paper examines the user pairing scheme that will be called D-NOMA (Distributed NOMA), in a uniform deployment scenario, to distribute the data throughput in the N OMA sets, to exploit the intergroup gap and facilitate a controlled data throughput distribution of NomA weak pairs more precisely. The proposed algorithm aims to enhance the spectral efficiency of the system and the successive interference cancelation performance by guaranteeing a high difference in channel-gain between the paired users per subcarrier. Two-user NOMA has been standardized as Multi-user Superposition Transmission (MUST) in 3GPP Jun 21, 2023 · We propose a joint user equipment (UE) clustering and RIS assignment/alignment approach that jointly ensures the power reception disparity required by the power domain NOMA (PD-NOMA). Jul 13, 2018 · However, the introduction of NOMA for all the users will increase the system complexity and bring more interference. Various new transmission paradigms such as non-orthogonal multiple access (NOMA) and cognitive radio (CR) have emerged as potential 5G enabling technologies. users in NOMA uplink are paired optimally. In this paper, we evaluate the performance of multiple-input multiple-output (MIMO) communication systems applied with a non-orthogonal multiple access (NOMA)-based indoor visible light communication (VLC). Apr 30, 2022 · In next-generation wireless communication systems, non-orthogonal multiple access (NOMA) has been recognized as essential technology for improving the spectrum efficiency. Jul 6, 2017 · It is shown that random and optimum user pairing perform similarly in the large system limit, but optimum pairing is significantly better in finite dimensions. 56 created a user pairing matrix based on the fading link gains of all Jul 7, 2016 · Non-orthogonal multiple access (NOMA) is a promising multiple access scheme for next generation wireless networks. The combinatorial problem of user pairing to achieve the maximum sum rate is analyzed in the large system limit for various scenarios, and some optimum In this paper, we investigate the joint user pairing and power coefficient allocation for unmanned aerial vehicle (UAV) systems which employ non-orthogonal multiple access (NOMA) to communicate with multiple ground users. Mar 20, 2018 · Abstract: User pairing in non-orthogonal multiple-access (NOMA) uplink is investigated considering some predefined power allocation schemes. In The potential of non-orthogonal multiple access (NOMA) as a multiple access strategy for 5G and LTE upgrades has attracted much attention. By utilizing successive Integrated sensing and communication (ISAC) is a promising paradigm to efficiently utilize the radio resources and hardware for both sensing and communication in the future Internet of Things (IoT). Then, we formulate the optimization problem with the objective of maximizing the total throughput of mobile users (MUs) by jointly optimizing the decoding order, user pairing, active beamforming, and passive beamforming. We first formulate a sum-rate maximization problem for Jan 23, 2022 · This paper provides a comprehensive framework to analyze the performance of non-orthogonal multiple access (NOMA) in the downlink transmission of a single-carrier and multi-carrier terahertz (THz) network. Simulation results validate that the proposed joint user pairing and beamforming design achieves noticeable performance improvements compared to the existing methods. To gain insight into the optimal structure of this problem, we derive the optimal power allocation and To cancel the interference of other users’ downlink uses successive interference cancellation (SIC). In addition to a feasibility analysis on promoting more paired users by increasing certain power, the relationship between the required power boosting and channel Thus, it is advisable to divide users into orthogonal frequency groups and adopt a Conventional NOMA (C-NOMA) pairing within each group (hybrid NOMA). Each PRB can be allocated to a pair of UEs using NOMA Dec 1, 2023 · In this paper, a downlink non-orthogonal multiple access (NOMA) network is studied. After that, the channel capacity is divided by the number of pairs, with each pair sharing the same sub-channel to deliver their data. Oct 1, 2018 · This paper comprehensively investigates the dynamics of user pairing and power allocation (UPPA) in non-orthogonal multiple access (NOMA). To the best of our knowledge, at date, most of the works on NOMA face this aspect pairing at most two users per sub-channel [4, 8, 17]. In further detail, in this paper we investigate the secrecy rates and provide closed-form expressions for the secrecy outage probability in a full-duplex two-user NOMA uplink network. To reduce the communication latency caused by user pairing, we propose an ultra-fast user pairing algorithm using laser chaos based Multi-Armed-Bandit (MAB) algorithm. The research work on NOMA user pairing and power allocation normally considers uniform distribution of users in a cellular area, such that each cell center user can find a cell edge user to make a user pair. In the considered scenario, different satellite In this paper, we study the coverage probability and average data rate of user pairing in cooperative non-orthogonal multiple access (NOMA) networks. So, we proposed the modified Hungarian method for the problem of user pairing, which provides the same performance as HA but with lower complexity . Fig. However, due to the new capability of IRS in reconfiguring the wireless propagation channels, it is fundamentally unknown which multiple access scheme is superior in the IRS-assisted wireless network Mar 1, 2021 · Non-orthogonal multiple access (NOMA) is a prominent 5G wireless communication technique which ensures higher spectral efficiency, low latency and user fairness. Feb 24, 2023 · Moreover, HA is perfectly suitable for pairing the users on the SB in the NOMA systems to improve the sum rate [13, 22, 28]. Random user pairing naturally leads to a non May 1, 2022 · The implementation of NOMA is not viable on all the users jointly because of the added signalling overhead related to channel feedback management and propagation of errors [30]. The next nearest user is paired with the next farthest user and so on. Aug 13, 2022 · Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for resource allocation improvement in the (5th) generation of cellular networks. Specifically, we first develop a novel user pairing scheme for the THz-NOMA network which ensures the performance gains of NOMA over orthogonal multiple access (OMA) for each individual user Aug 9, 2023 · In this paper, we investigate a user pairing problem in power domain non-orthogonal multiple access (NOMA) scheme-aided satellite networks. In fact, in the literature more focus is given to downlink NOMA, and as far as the authors know the rare cases that address the uplink consider cooperative NOMA networks. Specifically, we leverage the potential gains of cooperative links between far and near NOMA users in terms of reducing Aug 17, 2019 · However, another aspect which represents a key factor for NOMA system performance, is the user-aggregation policy adopted for multiplexing users along different sub-channels . In this paper, we propose two user pairing algorithms for cooperative downlink non-orthogonal multiple access (NOMA) system, where a base station (BS) equipped with N antennas selects N pairs of users equipped with single antenna to serve. Jul 13, 2021 · SIC and user pairing (UP) has a major influence on NOMA performance . To evaluate the performance of the proposed scheme, we The primary issues that we address in this work are related to how to pair NOMA users within each available orthogonal resource, user-pairing strategy for NOMA as well as cooperative relaying in our UAV model, which has a better performance given a specific user pairing strategy. A hierarchical power allocation process is proposed, whereby the users are divided into two groups In this letter, we propose a two-step user-paring scheme for an orthogonal frequency-division multiplexing (OFDM)-based cooperative non-orthogonal multiple-access (NOMA) system where far users cannot communicate with the base station directly. further analysis on user-pairing strategies in NOMA, showing that optimizing pairing can significantly improve sum-rate performance. This study investigates a non-orthogonal multiple access (NOMA)-assisted cell-free massive multiple-input multiple-output (MIMO) system, considering the impact of both individual and linear-combination channel estimations. Otherwise, the expected improvements in the network through-puts will not be realized in practice. This paper presents a novel two-dimensional orthogonal multiple access (OMA)-NOMA CR-based power minimization approach for battery-constrained This correspondence investigates the optimal decoding order and its impact on user pairing in non-orthogonal multiple access (NOMA)-enabled coordinated multipoint (CoMP) joint transmission (JT) to maximize the sum rate of users. We present a detailed analysis on α-Fairness among the 2-user pair in a practical NOMA system with imperfect SIC. To make the best use of NOMA as an enabler for cell-free massive MIMO systems, user pairing should be employed effectively. In this paper, we propose a joint optimization of user pairing strategy with beamforming and power allocation to maximize the minimum downlink rate per Jan 23, 2022 · This paper provides a comprehensive framework to analyze the performance of non-orthogonal multiple access (NOMA) in the downlink transmission of a single-carrier and multi-carrier terahertz (THz) network. The considered problem belongs to a difficult class of mixed-integer nonconvex optimization programming. Furthermore, we design a user pairing scheme to construct the user set for NOMA transmission in the same communication channels. Aug 3, 2021 · We propose a novel graph-theoretical dynamic user pairing strategy based on the user rate requirements in cellular networks employing non-orthogonal multiple access (NOMA). NOMA, in spite of bestowing with an enhancement in spectral efficiency (SE) by enabling the Nov 23, 2018 · A user pairing and pair scheduling algorithm, which can, simultaneously, pair the selected users and schedule suitable user pairs for data transmission, and has excellent sum rate and outage performance compared with the traditional user pairing algorithms. In this paper, we consider a hybrid system where NOMA is applied together with OMA, i. Apr 19, 2021 · A recent study on user pairing in NOMA with practical SIC is presented in [21]. The first step is for allocating near users, and the second step is for allocating far users. Jul 26, 2021 · In this method, the nearest user to the base station is paired with the farthest user from the base station. pbaix ypfqhi zihfyp tvirv obwp utc okcnt ooqap kzckffm jeblaeq