Filters








211 Hits in 10.2 sec

Sum rates, rate allocation, and user scheduling for multi-user MIMO vector perturbation precoding

Adeel Razi, Daniel Ryan, Iain Collings, Jinhong Yuan
2010 IEEE Transactions on Wireless Communications  
We conclude that for vector perturbation precoding most of the sum rate gains can be achieved by reducing the rate allocation problem to the user selection problem.  ...  We derive expressions for the sum rate in terms of the average energy of the precoded vector, and use this to derive a high signal-to-noise ratio (SNR) closed-form upper bound, which we show to be tight  ...  "Sum Rates, Rate Allocation, and User Scheduling for Multi-user MIMO Vector Perturbation Precoding"  ... 
doi:10.1109/twc.2010.01.090649 fatcat:ybzcsmj2d5embkq6ooxlb4776u

A Tradeoff among Fsc and Csi in Multiple Networking Systems

G. Mahesh, A Leelavathi
2014 IOSR Journal of Electronics and Communication Engineering  
In terms of system design, this corresponds to a preference for acquiring high-quality feedback from a few users on each time-frequency resource block, as opposed to coarse feedback from many users on  ...  Acquiring feedback from many receivers allows multiuser diversity to be exploited, while high-rate feedback allows for very precise selection of beamforming directions.  ...  Another way of looking at rate allocation is by scheduling users for data transfer such that the system sum rate is maximized.  ... 
doi:10.9790/2834-09533743 fatcat:x6quqidsyncwfhgc5sua3ycejm

Recent advances in multiuser MIMO systems

Rodrigo C de Lamare, Martin Haardt, Michael Joham, Didier Le Ruyet, David J Love
2011 EURASIP Journal on Wireless Communications and Networking  
sum-rate maximization for successive zero-  ...  The third group of papers focuses on resource allocation strategies for multiuser MIMO systems, which includes techniques for power allocation, user selection and scheduling.  ...  The third group of papers focuses on resource allocation strategies for multiuser MIMO systems, which includes techniques for power allocation, user selection and scheduling.  ... 
doi:10.1186/1687-1499-2011-157 fatcat:alwdnbrm3vclzdwoh23vq7n534

Massive MIMO Systems: Signal Processing Challenges and Research Trends [article]

R. C. de Lamare
2013 arXiv   pre-print
A linear algebra approach is considered for the description of the system and data models of massive MIMO architectures.  ...  The operational requirements of massive MIMO systems are discussed along with their operation in time-division duplexing mode, resource allocation and calibration requirements.  ...  to a chosen criterion such as the sum rate or a user target rate.  ... 
arXiv:1310.7282v1 fatcat:me2syt3uhrfi3l5nskhrjapzca

An Overview on Resource Allocation Techniques for Multi-User MIMO Systems

Eduardo Castaneda, Adao Silva, Atilio Gameiro, Marios Kountouris
2017 IEEE Communications Surveys and Tutorials  
antennas, spatial signaling, rate and power allocation, and transmission technique.  ...  The overall performance of MU-MIMO systems is a complex joint multi-objective optimization problem since many variables and parameters have to be optimized, including the number of users, the number of  ...  Index Terms-Downlink transmission, multi-user MIMO, precoding, resource allocation, spatial multiplexing, user scheduling. I.  ... 
doi:10.1109/comst.2016.2618870 fatcat:7kehhw6eibc7dfsjyovsf3t6ia

Scheduling for Multiuser MIMO Broadcast Systems: Transmit or Receive Beamforming?

Li-Chun Wang, Chu-Jung Yeh
2010 IEEE Transactions on Wireless Communications  
Instead of assuming a large number of users to obtain a scaling law as most current work, we derive the sum rate formulas of the ZF MIMO broadcast systems with a small number of scheduled users.  ...  In this paper, we present an approximation formula and the close-form expression for the sum rate of the transmit and the receive zero-forcing (ZF) multiple-input multiple-output (MIMO) broadcast systems  ...  For a finite number of users, a close-form sum rate expression was derived for the receive ZF scheduler based on equal power allocation [22] .  ... 
doi:10.1109/twc.2010.072110.081226 fatcat:cd7gp7cgjvgh7lr5jvpfecuxf4

Multi-User Visible Light Communications: State-of-the-Art and Future Directions

Saad Al-Ahmadi, Omar Maraqa, Murat Uysal, Sadiq M. Sait
2018 IEEE Access  
In this paper, we provide a comprehensive overview of multi-user VLC systems discussing the recent advances on multi-user precoding, multiple access, resource allocation, and mobility management.  ...  VLC has recently gained interest as cost-effective, secure, and energy-efficient wireless access technology particularly for indoor user-dense environments.  ...  diversity) while the sum rate capacity for vector BC channels can be achieved also by DPC.  ... 
doi:10.1109/access.2018.2879885 fatcat:y7ltnuy4yjfzzggeaolnasttz4

Precoding for High Throughput Satellite Communication Systems: A Survey [article]

Malek Khammassi, Abla Kammoun, Mohamed-Slim Alouini
2022 arXiv   pre-print
With the expanding demand for high data rates and extensive coverage, high throughput satellite (HTS) communication systems are emerging as a key technology for future communication generations.  ...  Further, practical system impairments are discussed, and robust precoding techniques are presented. Finally, future trends in precoding for satellites are addressed to spur further research.  ...  For example, one can readily employ multi-user detection and precoding techniques by modeling the return link as a MIMO multiple access channel and the forward link as a MIMO broadcast channel.  ... 
arXiv:2208.08542v1 fatcat:6nzq52blobawpc2ouixsd37pte

Pilot Distribution Optimization and Power Control in Multi-Cellular Large Scale MIMO Systems [article]

Jose Carlos Marinello, Taufik Abrao
2016 arXiv   pre-print
For unitary frequency reuse factor, we have found that the data throughput provided for 95% of the users increases when applying power control algorithm from 134kbps to 1.461Mbps with no pilot allocation  ...  Massive MIMO communication systems have been identified as one of the most prominent technologies of the next generation wireless standards, such as 5G, due to the large gains in energy and spectral efficiency  ...  However, in the large-system analysis, it was shown that linear precoding schemes outperforms TDVP, in terms of increased sum rates, regardless of the user scheduling method adopted.  ... 
arXiv:1611.01130v1 fatcat:bnxqepzh65frni6ht2cy6rythy

Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends [article]

Yijie Mao, Onur Dizdar, Bruno Clerckx, Robert Schober, Petar Popovski, H. Vincent Poor
2022 arXiv   pre-print
Rate-splitting multiple access (RSMA) has emerged as a novel, general, and powerful framework for the design and optimization of non-orthogonal transmission, multiple access (MA), and interference management  ...  a wide range of network loads (including both underloaded and overloaded regimes) and user channel conditions.  ...  Alternative non-linear precoding techniques such as Tomlinson-Harashima precoding (THP) and vector perturbation precoding have therefore been proposed.  ... 
arXiv:2201.03192v2 fatcat:z3ujjbqwxzc5dbgu3ganoqomae

Coordinated Tomlinson-Harashima precoding design algorithms for overloaded multi-user MIMO systems

Keke Zu, Bin Song, Martin Haardt, Rodrigo C. de Lamare
2014 2014 11th International Symposium on Wireless Communications Systems (ISWCS)  
The proposed algorithm is implemented on two types of THP structures, the decentralized THP (dTHP) with diagonal weighted filters at the receivers of the users, and the centralized THP (cTHP) with diagonal  ...  Simulation results show that a significantly better bit error rate (BER) and sumrate performances can be achieved by the proposed iterative coordinate THP algorithm as compared to previously reported techniques  ...  INTRODUCTION In multi-user MIMO (MU-MIMO) broadcast channels with independent and identically distributed (i.i.d.)  ... 
doi:10.1109/iswcs.2014.6933340 dblp:conf/iswcs/ZuSHL14 fatcat:yothehybf5b5zgomjiff7vfoki

Hybrid MU-MIMO Precoding Based on K-Means User Clustering

Razvan-Florentin Trifan, Andrei-Alexandru Enescu, Constantin Paleologu
2019 Algorithms  
Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) systems have been extensively investigated over the last few years from both theoretical and practical perspectives.  ...  Finding the optimum set of users that can be co-scheduled through LP schemes could require an exhaustive search and, thus, may not be affordable for practical systems.  ...  Vector Perturbation Precoding Vector perturbation works similarly to THP, as the transmitted symbols are "perturbed" and moved from the original to a new constellation of points.  ... 
doi:10.3390/a12070146 fatcat:tpidckhjwffk3h5le3dwsv4ffa

Linear and Dirty-Paper Techniques for the Multiuser MIMO Downlink [chapter]

Christian B. Peel, Quentin H. Spencer, A.Lee Swindlehurst, Martin Haardt, Bertrand M. Hochwald
2005 Space-Time Processing for MIMO Communications  
Multi-input, multi-output (MIMO) communications systems have attracted considerable attention over the past decade, mostly for single-user, point-to-point scenarios.  ...  Only recently has the multi-user MIMO downlink been addressed, beginning with information-theoretic capacity results [1] [2] [3] [4] [5] , and followed by practical implementations, including those based  ...  Acknowledgments Work for this paper was supported in part by the U.S. National Science Foundation under Information Technology Research Grants CCR-0081476 and CCR-0313056.  ... 
doi:10.1002/0470010045.ch6 fatcat:npfr4rgcunesjdw4mcs5a2vff4

User scheduling for MU-MIMO transmission with active CSI feedback

Kyu-haeng Lee, Chong-kwon Kim
2015 EURASIP Journal on Wireless Communications and Networking  
User scheduling boosts the multi-user multi-input multi-output (MU-MIMO) gain by selecting an optimal set of users to increase the 802.11 Wi-Fi system capacities.  ...  In this paper, we propose a new MU-MIMO MAC protocol, called 802.11ac+, including a novel user scheduling algorithm.  ...  Along this line, Lima et al. consider a frequency allocation problem for MIMO-OFDMA networks [14] .  ... 
doi:10.1186/s13638-015-0331-4 fatcat:c7uoxe7dd5ca7i2fanbvq5mlq4

Tomlinson–Harashima Precoding for Multiuser MIMO Systems With Quantized CSI Feedback and User Scheduling

Liang Sun, Matthew R. McKay
2014 IEEE Transactions on Signal Processing  
This paper studies the sum rate performance of a low complexity quantized CSI-based Tomlinson-Harashima (TH) precoding scheme for downlink multiuser MIMO tansmission, employing greedy user selection.  ...  For fixed finite signal to noise ratios and a finite number of transmit antennas n_T, we prove that as K grows large, the proposed approach can achieve the optimal sum rate scaling of the MIMO broadcast  ...  Vector perturbation has been proposed for multiuser MIMO channel model which can achieve rates near sum capacity [7] .  ... 
doi:10.1109/tsp.2014.2336633 fatcat:4lpni66pxzcvdoevz7lykhx7a4
« Previous Showing results 1 — 15 out of 211 results