Filters








57 Hits in 3.1 sec

Adaptive Downlink OFDMA System With Low-Overhead and Limited Feedback in Time-Varying Underwater Acoustic Channel

Gang Qiao, Lei Liu, Lu Ma, Yanling Yin
2019 IEEE Access  
Because of the time-varying characteristic and the large propagation delay in underwater acoustic (UWA) channel, adaptive resource allocation in UWA orthogonal frequency-division multiplexing access (OFDMA  ...  Therefore, this paper focuses on the outdated CSI and proposes an adaptive downlink OFDMA system with low-overhead and limited feedback in time-varying UWA channel.  ...  In [15] , a heuristic resource allocation method for underwater uplink OFDMA system was proposed to reduce computational complexity, but it assumes that the channel state is unchanged during the time  ... 
doi:10.1109/access.2019.2892812 fatcat:tw4usqbkynb4hn6pilgzf6k5ne

Downlink Power Allocation Strategy for Next-Generation Underwater Acoustic Communications Networks

Ahmad, Chang
2019 Electronics  
In this paper, we employ a downlink (DL) power allocation (PA) strategy using an orthogonal frequency-division multiple access (OFDMA) technique for underwater acoustic communications (UAC) networks.  ...  The increasing interest in next-generation underwater acoustic communications networks is due to vast investigation of oceans for oceanography, commercial operations in maritime areas, military surveillance  ...  In this paper, we consider a cellular type of UAC network architecture and employ a downlink (DL) power allocation (PA) strategy to analyze system throughput and outage performance in a system-level simulation  ... 
doi:10.3390/electronics8111297 fatcat:jaqbck7l35a25clq5lsbgomfmi

Table of Contents

2021 IEEE Transactions on Vehicular Technology  
Yang Channel State Information Prediction for Adaptive Underwater Acoustic Downlink OFDMA System: Deep Neural Networks Based Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  ...  Multi-AUV Collaborative Data Collection Algorithm Based on Q-Learning in Underwater Acoustic Sensor Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  ... 
doi:10.1109/tvt.2021.3108593 fatcat:feewwd6epzgjvg7v3g3dpmxopa

OSPG-MAC: An OFDMA-Based Subcarrier Pregrouping MAC Protocol for Underwater Acoustic Wireless Sensor Networks

Yishan Su, Yongpeng Zuo, Zhigang Jin, Xiaomei Fu
2019 Journal of Sensors  
In underwater acoustic wireless sensor networks (UAWSNs), designing media access control (MAC) protocols is highly challenging because of their significant influence on network performance.  ...  To make it easier to allocate subcarriers and avoid conflict, we group all the subcarriers into fixed subchannels in advance and allocate them in terms of these subchannels.  ...  through 61862020, 61861014, and 61701335; the Key Research and Development Plan of Hainan through ZDYF2018006; Natural Science Foundation of Tianjin through 17JCQNJC01300; and Science and Technology on Underwater  ... 
doi:10.1155/2019/4965231 fatcat:4yeigfe2tbed7psrx5pbhlol6i

A COMPREHENSIVE STUDY ON EFFICIENT RESOURCE ALLOCATION BY QoS IN WIRELESS NETWORKS

Manju C Thayammal, M Mary Linda
2017 ICTACT Journal on Communication Technology  
Resource allocation is a paramount topic in Wireless Networks with unsuitable resource allocation causing congestion and unfairness to users, where it has been used in Wired Networks such as telecommunications  ...  Finally, this paper presents the outcomes of survey which comprises significant observations, limitations and idea of further research in improving QoS in various wireless networks.  ...  These technologies are used in underwater acoustic wireless networks and the problem occurred is Doppler shift problem which result in ICI also he proposed a Doppler compensation resource allocation scheme  ... 
doi:10.21917/ijct.2017.0216 fatcat:pvc32ffeufcilibtmzqsgvb2tm

Table of Contents

2020 IEEE Transactions on Vehicular Technology  
Node Location Algorithm Based on Node Movement Prediction in Underwater Acoustic Sensor Networks . . . . . . . . . .  ...  Uchôa-Filho 2957 Location Based Joint Spectrum Sensing and Radio Resource Allocation in Cognitive Radio Enabled LTE-U Systems . . .  ... 
doi:10.1109/tvt.2020.2970959 fatcat:rmi2juemdneozo47iagkyagi6i

Capacity Analysis of NOMA-Enabled Underwater VLC Networks

Mohammed Elamassie, Lina Bariah, Murat Uysal, Sami Muhaidat, Paschalis C. Sofotasios
2021 IEEE Access  
Our results reveal that NOMA system is not only characterized by achieving higher sum capacity than the sum capacity of its counterpart, OFDMA system.  ...  Moreover, we compare the achievable capacity of NOMA system with its counterpart, i.e., orthogonal frequency division multiple access (OFDMA).  ...  Unlike OFDMA where nodes are allocated orthogonal resources in frequency domain.  ... 
doi:10.1109/access.2021.3122399 fatcat:goruj6s53jajxow43wxsfiyofm

Adaptive Energy Efficiency Maximization for Cognitive Underwater Acoustic Network under Spectrum Sensing Errors and CSI Uncertainties

Yaohui Wu, Youming Li, Qingpeng Yao
2019 Wireless Communications and Mobile Computing  
Energy efficiency (EE) maximization problem for Cognitive Underwater Acoustic Network is investigated in this study.  ...  Thus, an adaptive resource allocation scheme is proposed to maximize the EE, subject to the transmission power constraint of secondary user (SU) and the interference power constraint of primary user (PU  ...  The first constraint imposes the exclusive subcarrier allocation of OFDMA system [22] . The second constraint limits the total power allocated to each SU-Rx.  ... 
doi:10.1155/2019/2875136 fatcat:ftinkokwone6xak432ii7bf3aq

A novel distributed scheduling scheme for OFDMA uplink using channel information and probabilistic transmission

Elias Yaacoub, Zaher Dawy, Mohamad Adnan Al-Alaoui
2011 Computer Communications  
Distributed uplink scheduling in OFDMA systems is considered. In the proposed model, mobile terminals have the responsibility of making their own transmission decisions.  ...  Furthermore, it allows avoiding collisions during transmission since it leads to collision detection during the resource reservation phase.  ...  ACKNOWLEDGMENT The authors would like to thank the anonymous reviewers for their constructive feedback and comments that helped in reshaping this paper and in enhancing its quality and clarity.  ... 
doi:10.1016/j.comcom.2011.06.009 fatcat:z4ajwm7ehjhjtozboq4bvmdx24

2020 Index IEEE Transactions on Wireless Communications Vol. 19

2020 IEEE Transactions on Wireless Communications  
., Joint Access and Backhaul Resource Management in Satellite-Drone Networks: A Competitive Market Approach; TWC June 2020 3908-3923 Hu, Y.H., see Xia, M., TWC June 2020 3769-3781 Hua, C., see Li, M  ...  2020 650-664 Huang, A., see He, H., TWC Dec. 2020 7881-7896 Huang, C., Molisch, A.F., He, R., Wang, R., Tang, P., Ai, B., and Zhong, Z., Machine Learning-Enabled LOS/NLOS Identification for MIMO Systems  ...  ., +, TWC Feb. 2020 729-743 New Results on Joint Channel and Impulsive Noise Estimation and Tracking in Underwater Acoustic OFDM Systems.  ... 
doi:10.1109/twc.2020.3044507 fatcat:ie4rwz4dgvaqbaxf3idysubc54

IEEE Access Special Section Editorial: Emerging Trends, Issues, and Challenges in Underwater Acoustic Sensor Networks

Guangjie Han, Muhammad Imran, Danda B. Rawat, Sammy Chan, Fatos Xhafa
2021 IEEE Access  
and proposes an adaptive downlink orthogonal frequency-division multiplexing access (OFDMA) system with low-overhead and limited feedback in time-varying underwater acoustic (UWA) channel.  ...  The article ''Adaptive downlink OFDMA system with lowoverhead and limited feedback in time-varying underwater acoustic channel,'' by Qiao et al., focuses on the outdated channel state information (CSI)  ...  He has served/is serving as a Guest Editor for about two dozen special issues in journals, such as IEEE Communications Magazine, IEEE Wireless Communications Magazine, Future Generation Computer Systems  ... 
doi:10.1109/access.2020.3048580 fatcat:fxnwqo2q3fb2zndmxsv3vffpo4

A Survey of Rate-optimal Power Domain NOMA with Enabling Technologies of Future Wireless Networks [article]

Omar Maraqa, Aditya S. Rajasekaran
2020 arXiv   pre-print
Among the candidate schemes for future wireless networks are NOMA schemes that allow serving more than one user in the same resource block by multiplexing users in other domains than frequency or time.  ...  The considered system models, the optimization methods utilized to maximize the achievable rates, and the main lessons learnt on the optimization and the performance of these NOMA-enabled schemes and technologies  ...  examine the sum-rate performance of underwater acoustic NOMA system with the joint optimization of power allocation, resource allocation, and user clustering.  ... 
arXiv:1909.08011v4 fatcat:xlt7aul75zhozkb2stpbs4q2fm

A Multi-user Detection scheme based on Polar Code Construction in Downlink Underwater Acoustic OFDM Communication System

Gang Qiao, Siyu Xing, Feng Zhou
2019 IEEE Access  
In this paper, we propose a novel polar code construction scheme, suitable for the underwater acoustic (UWA) multi-user communication system using orthogonal frequency division multiplexing (OFDM).  ...  INDEX TERMS Underwater acoustic communication (UAC), orthogonal frequency division multiplexing (OFDM), multi-user detection, polar code construction.  ...  Therefore, OFDM has been extensively used in high-rate underwater acoustic communication (UAC) systems [2] - [4] .  ... 
doi:10.1109/access.2019.2916995 fatcat:dh34liv73vapxdfivvjm3ghaxa

Game-Theory-Based on Downlink Spectrum Allocation in Two-Tier Networks

Yu Zhang, Ye Tian, Fang Ye Yixuan Kang
2019 Zenodo  
This paper proposes a game-theory-based on OFDMA downlink spectrum allocation aiming at reducing co-channel interference in two-tier femtocell networks.  ...  Numerical results show that signal to interference and noise ratio can be obviously improved through the spectrum allocation scheme and the users quality of service in downlink can be satisfied.  ...  POTENTIAL GAME THEORETIC FRAMEWORK In this work, we consider the downlink scenario in a two-tier femtocell network, where time is divided into fixed-length time slots and OFDMA is assumed in each slot.  ... 
doi:10.5281/zenodo.3299434 fatcat:xtuuesiporg4tmfcokol5qwvpm

Optical Wireless Hybrid Networks: Trends, Opportunities, Challenges, and Research Directions

Mostafa Zaman Chowdhury, Moh Khalid Hasan, Md. Shahjalal, Md. Tanvir Hossan, Yeong Min Jang
2020 IEEE Communications Surveys and Tutorials  
Moreover, we consider underwater acoustic communication for hybrid acoustic/optical systems. The opportunities brought by hybrid systems are presented in detail.  ...  The co-deployment of wireless systems can improve system performance in terms of throughput, reliability, and energy efficiency of individual networks.  ...  Several studies already addressed resource allocation issues in their work.  ... 
doi:10.1109/comst.2020.2966855 fatcat:qgkoolfncjbm3cqwj7a3b7kr2i
« Previous Showing results 1 — 15 out of 57 results