228 Hits in 7.6 sec

MIMO Broadcast Scheduling with Limited Feedback

Wei Zhang, Khaled Letaief
2007 IEEE Journal on Selected Areas in Communications  
The second reduced feedback scheduling approach employs quantization for each user, in which only few bits of quantized SINR are fed back to the BS.  ...  In the first approach, which we shall refer to as selected feedback scheduling, the users are selected based on their SINR compared to a predesigned threshold.  ...  In contrast, here the quantization of SINR is employed for each user in a multiuser MIMO system.  ... 
doi:10.1109/jsac.2007.070918 fatcat:txw2tol4fjfqdib6oil5nllwla

Scheduling for Multiuser MIMO Downlink Channels with Ranking-Based Feedback

Marios Kountouris, Thomas Sälzer, David Gesbert
2008 EURASIP Journal on Advances in Signal Processing  
The performance of a system that performs user selection using ranking-based CSIT in the context of random opportunistic beamforming is analyzed, and we provide design guidelines on the number of required  ...  We propose a novel type of CSIT representation for the purpose of user selection, coined as ranking-based feedback.  ...  The system rate of a system employing ranking-based feedback metric for user selection is analyzed in Section 4.  ... 
doi:10.1155/2008/854120 fatcat:2f4rcyi4tber3fwrh7uruschxq

Opportunistic Feedback for Multiuser MIMO Systems With Linear Receivers

Taiwen Tang, Robert W. Heath, Sunghyun Cho, Sangboh Yun
2007 IEEE Transactions on Communications  
A novel multiuser scheduling and feedback strategy for the multiple-input multiple-output (MIMO) downlink is proposed in this paper.  ...  In this system, the base station requires users' channel quality on each spatial channel for scheduling. An opportunistic feedback protocol is proposed to reduce the feedback requirements.  ...  CONCLUSION In this paper, we proposed a scheduling and feedback strategy for the MIMO downlink. The base station uses per-antenna scheduling while the users employ linear receivers.  ... 
doi:10.1109/tcomm.2007.896013 fatcat:3r5jqixd6ne3fhrqpaxv56drzy

Antenna Diversity in Multiuser Data Networks

J. Jiang, R.M. Buehrer, W.H. Tranter
2004 IEEE Transactions on Communications  
Jing Jiang (S'98) received the B.S. and M.S. degrees in radio engineering with honors from the  ...  ASYMPTOTIC SUM RATE A. Multiuser Channel Model We use a simple downlink model of a cellular packet data system, in which the base station transmitter sends packets to mobile terminals.  ...  of diversity, termed multiuser diversity, is obtained in a data system.  ... 
doi:10.1109/tcomm.2004.823637 fatcat:xdzlto2guzd5tp5ka4wradyarm

Sum Rate Analysis of a Reduced Feedback OFDMA Downlink System Employing Joint Scheduling and Diversity

Seong-Ho Hur, Bhaskar D. Rao
2012 IEEE Transactions on Signal Processing  
We consider joint scheduling and diversity to enhance the benefits of multiuser diversity in an system.  ...  Assuming largest normalized scheduling and a general value for , we develop a unified framework to analyze the sum rate of the system for both the quantized and non-quantized feedback schemes.  ...  CONCLUSION We considered joint scheduling and diversity to enhance the benefits of multiuser diversity in a multiuser OFDMA scheduling system.  ... 
doi:10.1109/tsp.2011.2173335 fatcat:5g4dmenqxng5dcgh23oq3xi74y

Performance of Orthogonal Beamforming for SDMA with Limited Feedback [article]

Kaibin Huang, Jeffrey G. Andrews, Robert W. Heath Jr
2008 arXiv   pre-print
PU2RC supports multiuser simultaneous transmission, enables limited feedback, and is capable of exploiting multiuser diversity.  ...  The optimal multiuser transmission, known as dirty paper coding, is not directly realizable.  ...  Both scheduling and beamforming in a SDMA system require channel state information (CSI) at the base station.  ... 
arXiv:cs/0606121v3 fatcat:t5q4age465b7xj227newnw2zgy

Multiuser Diversity - Multiplexing Tradeoff in MIMO Broadcast Channels with Limited Feedback

Marios Kountouris, Ruben de Francisco, David Gesbert, Dirk T. M. Slock, Thomas Salzer
2006 2006 Fortieth Asilomar Conference on Signals, Systems and Computers  
We consider joint scheduling and beamforming in a broadcast channel with multiple antennas at the transmitter and a single antenna at the mobile receiver.  ...  We identify the tradeoff between multiuser diversity and spatial multiplexing gain given a limited amount of feedback bits.  ...  In a system with joint downlink scheduling and beamforming with limited feedback, beamforming is performed based on quantized channel directions.  ... 
doi:10.1109/acssc.2006.354769 fatcat:7ucyavrlajahvhyhp4n6knl2cy

A Design Framework for Scalar Feedback in MIMO Broadcast Channels

Ruben de Francisco, Dirk T. M. Slock
2007 EURASIP Journal on Advances in Signal Processing  
Recommended by Markus Rupp Joint linear beamforming and scheduling are performed in a system where limited feedback is present at the transmitter side.  ...  In this paper, we present a design framework for scalar feedback in MIMO broadcast channels with limited feedback.  ...  The design framework for scalar feedback here presented can be applied to any system in which codebooks are employed for channel quantization, known both to the base station and mobile users.  ... 
doi:10.1155/2008/574784 fatcat:wvrxofnp35euhm3cq5wr3mikuq

Fairness, power allocation, and CSI quantization in block fading multiuser systems

Behrooz Makki, Thomas Eriksson
2013 EURASIP Journal on Wireless Communications and Networking  
This paper studies the fairness, power allocation, and channel state information (CSI) quantization in multiuser systems utilizing multiple feedback bits per user.  ...  For a given set of schedulers, we obtain the system throughput with different power allocation strategies and any combination of different fading distributions.  ...  A scheduler is employed by the BS which, based on the criterion c, selects one of the receivers to be served at any time slot d .  ... 
doi:10.1186/1687-1499-2013-249 fatcat:z363byljrbazbon63pwgopteme

Performance Analysis for Physical Layer Security in Multi-Antenna Downlink Networks with Limited CSI Feedback

Xiaoming Chen, Rui Yin
2013 IEEE Wireless Communications Letters  
This letter focuses on the quantitative analysis of the ergodic secrecy sum-rate in terms of feedback amount of the CSI from the legitimate users in multiuser multi-antenna downlink networks.  ...  Channel state information (CSI) at the transmitter is of importance to the performance of physical layer security based on multi-antenna networks.  ...  SYSTEM MODEL We consider a homogeneous multiuser multi-antenna downlink network employing physical layer security for secure communication, where a base station (BS) equipped with N t > 1 antennas communicates  ... 
doi:10.1109/wcl.2013.061913.130344 fatcat:x72ttb7nvjgqzauh4ftcyzon5e

Optimization of Cyclic-Delay Diversity Aided Frequency-Selective Scheduling in OFDMA Downlink Systems

Yu-Fan Chen, Wern-Ho Sheen, Li-Chun Wang
2014 IEEE Transactions on Vehicular Technology  
In the optimization of schedulinginformation feedback, a new channel-dependent feedback (CDF) method is proposed, where the feedback resource is allocated to users according to their frequency-selectivity  ...  The optimized scheduler is shown to provide significant improvement in both system sum rate and user fairness over previous methods under fixed feedback overhead.  ...  Scheduler In a frequency-selective scheduling, the improvement on system performance mainly comes from the scheduler at the BS that exploits the advantage of multiuser diversity based on the information  ... 
doi:10.1109/tvt.2013.2286179 fatcat:yblepaebujgxrmh7cngga4jdem

Corrections to "Unified Laguerre Polynomial-Series-Based Distribution of Small-Scale Fading Envelopes" [Oct 09 3988-3999]

Yin Sun, Árpád Baricz, Shidong Zhou
2011 IEEE Transactions on Vehicular Technology  
A Laguerre polynomial-series-based cdf formula for non-central chi-square distribution is also provided as a special case of our unified cdf result.  ...  In this correspondence, we point out two typographical errors in Chai and Tjhung's paper and we offer the correct formula of the unified Laguerre polynomial-series-based cumulative distribution function  ...  In this paper, we will consider a multiuser MIMO downlink system with both quantized CDI and CQI feedbacks but pursue another optimal strategy: minimizing the total transmit power under individual signal-to-interference-plus-noise-ratio  ... 
doi:10.1109/tvt.2010.2087368 fatcat:tyywlih7wzftnp4jntjkxt4tdi

Energy optimization in multiuser quantized feedback systems

Saud Althunibat, Nizar Zorba, Fabrizio Granelli, Christos Verikoukis
2013 EURASIP Journal on Wireless Communications and Networking  
This article explores the effects of quantization of feedback information on energy consumption in multiuser wireless communication systems.  ...  In order to optimize the energy consumption of the system, the article concentrates on the amount of transmit energy, the additional energy due to quantization and the probability of power outage.  ...  Based on the above, an optimization to find the best amount of feedback bits is required, in order to optimize both the system performance and the energy consumption.  ... 
doi:10.1186/1687-1499-2013-83 fatcat:ddbcyqv7yzhiddvua52k5sq6se

Feedback Reduction for Random Beamforming in Multiuser MIMO Broadcast Channel [article]

Jin-Hao Li, Hsuan-Jung Su, Yu-Lun Tsai
2011 arXiv   pre-print
For the multiuser multiple-input multiple-output (MIMO) downlink channel, the users feedback their channel state information (CSI) to help the base station (BS) schedule users and improve the system sum  ...  In this paper, we propose a novel scheme to reduce the feedback load in a downlink orthogonal space division multiple access (SDMA) system with zero-forcing receivers by allowing the users to dynamically  ...  A reduced feedback scheme was proposed in the simulation, Scheme A and Scheme B use B Q,A and B Q,B bits, respectively, to optimally quantize their SNR values.  ... 
arXiv:1103.3885v1 fatcat:r2ari4ltd5cprpmfal6nehfgyy

Limited Feedback Designs for Machine-type Communications Exploiting User Cooperation [article]

Jiho Song, Byungju Lee, Song Noh, Jong-Ho Lee
2019 arXiv   pre-print
Multiuser multiple-input multiple-output (MIMO) systems are a prime candidate for use in massive connection density in machine-type communication (MTC) networks.  ...  In this paper, we propose a user cooperation-based limited feedback strategy to support high connection density in massive MTC networks.  ...  SYSTEM MODEL AND BACKGROUND We briefly review the FDD-based multiuser MIMO systems. We first present the system model and then discuss antenna combining-based limited feedback.  ... 
arXiv:1805.06583v5 fatcat:qmjz63jjgfbkljhnm6ogayqaby
« Previous Showing results 1 — 15 out of 228 results