Filters








820 Hits in 8.6 sec

Degrees of freedom in wireless multiuser spatial multiplex systems with multiple antennas

Wei Yu, Wonjong Rhee
2006 IEEE Transactions on Communications  
Index Terms-Broadcast channel, multiple-access channel, multiple-input multiple-output (MIMO) system, multiuser diversity, spatial diversity, spatial multiplex.  ...  Based on a sum-capacity criterion, this letter shows that the optimal transmission strategy in an uplink or downlink channel with n antennas at the base-station involves more than n users at the same time  ...  Theorem 1: In a multiple-antenna multiple-access fading channel with i.i.d. complex Gaussian channel matrices, assuming perfect channel side information at all the transmitters and at the receiver, the  ... 
doi:10.1109/tcomm.2006.881357 fatcat:rqryt2xrbfbs5lyc7bjwto26d4

Capacity limits of MIMO channels

A. Goldsmith, S.A. Jafar, N. Jindal, S. Vishwanath
2003 IEEE Journal on Selected Areas in Communications  
We show that the capacity region of the MIMO multiple access and the largest known achievable rate region (called the dirty-paper region) for the MIMO broadcast channel are intimately related via a duality  ...  We summarize results for the MIMO broadcast and MAC for channels that are either constant or fading with perfect instantaneous knowledge of the antenna gains at both transmitter(s) and receiver(s).  ...  Index Terms-Antenna correlation, beamforming, broadcast channels (BCs), channel distribution information (CDI), channel state information (CSI), multicell systems, multiple-access channels (MACs), multiple-input  ... 
doi:10.1109/jsac.2003.810294 fatcat:bhfypf6q55babacntxohjerjiu

Power optimization in fading Gaussian MIMO broadcast channels

Guangping Li, Steven D. Blostein, Jiayin Qin
2008 2008 24th Biennial Symposium on Communications  
In this paper, we consider the problem of minimizing longterm sum power under the constraint of an average sum rate in fading multiple input multiple output (MIMO) broadcast channels (BC) with additive  ...  We first formulate the equivalent convex optimization problem using the duality between the MIMO multi-access channel (MAC) and the MIMO BC.  ...  means that the matrix is positive semi- definite. 0 S % perfect transmitter channel state information, Dirty Paper coding (DPC) can be employed at the transmitter.  ... 
doi:10.1109/bsc.2008.4563277 fatcat:gur4fucdg5echotst2qc5o6qai

Non-linear Transceiver Design for Broadcast Channels with Statistical Channel State Information

M. Botros Shenouda, T. N. Davidson
2007 2007 IEEE International Symposium on Signal Processing and Information Technology  
Motivated by the sensitivity of both broadcast channels system in the presence of uncertain channel state information and TH precoding to channel uncertainty, we design, herein, (CSI) at the base station  ...  We consider the design of Tomlinson-Harashima coding is particularly sensitive to inaccuracies in CSI, e.g., (TH) transceivers for the downlink of a multiuser communication [8].  ...  Hence, a total W2 M-l [ IP/1AC 2, pMAC 2 jT(14) TH precoding is the availability of perfect Channel State Information (CSI) at the transmitter. Perfect CSI enables the II.  ... 
doi:10.1109/isspit.2007.4458190 fatcat:4dxxrhkcifhl3itevd75t54vkq

Jointly Broadcasting Data and Power with Quality of Service Guarantees [article]

P K Deekshith, Trupthi Chougule, Shreya Turmari, Ramya Raju, Rakshitha Ram, Vinod Sharma
2016 arXiv   pre-print
This communication framework is captured by a fading Gaussian Broadcast Channel (GBC) with energy harvesting transmitter and receivers.  ...  We show that a time-switching receiver can switch between information reception mode and energy harvesting mode, without the transmitter's knowledge of the same and without any extra rate loss.  ...  In this work, we consider the problem of Simultaneous Wireless Information and Power Transfer (SWIPT) over a fading Gaussian broadcast channel (GBC) with an energy harvesting transmitter, ensuring a certain  ... 
arXiv:1612.04176v1 fatcat:f5y2xwd53vaghl4kspseiewld4

On Ergodic Sum Capacity of Fading Cognitive Multiple-Access and Broadcast Channels

Rui Zhang, Shuguang Cui, Ying-Chang Liang
2009 IEEE Transactions on Information Theory  
In particular, the fading cognitive multiple-access channel (C-MAC) is first studied, where multiple secondary users transmit to the secondary base station (BS) under both individual transmit-power constraints  ...  The fading cognitive broadcast channel (C-BC) that models the downlink transmission in the secondary network is then studied under the LT/ST transmit-power constraint at the secondary BS jointly with the  ...  Let be a mapping function that gives the index of the SU selected for transmission at a fading state with channel realization .  ... 
doi:10.1109/tit.2009.2030449 fatcat:m7kr2ko27fckzf4vq5w7f5zvei

On the capacity of multiple access and broadcast fading Channels with full channel state information at low power regime

Zouheir Rezki, Mohamed-Slim Alouini
2013 2013 IEEE International Symposium on Information Theory  
We study the throughput capacity region of the Gaussian multi-access (MAC) fading channel with perfect channel state information (CSI) at the receiver and at the transmitters (CSI-TR), at low power regime  ...  Using the duality of Gaussian MAC and broadcast channels (BC), we provide a simple characterization of the BC capacity region at low power regime.  ...  In this paper, we aim at studying the throughput capacity region of multi-access (MAC) and broadcast (BC) fading channels with Gaussian noise, where perfect channel state information (CSI) at the receiver  ... 
doi:10.1109/isit.2013.6620681 dblp:conf/isit/RezkiA13 fatcat:a43whqh6vbhcrezwb5f574ctf4

Optimized transmission for fading multiple-access and broadcast channels with multiple antennas

M. Mohseni, Rui Zhang, J.M. Cioffi
2006 IEEE Journal on Selected Areas in Communications  
In particular, the fading multiple-access channel (MAC) and the fading broadcast channel (BC) with additive Gaussian noise and multiple transmit and receive antennas are focused.  ...  at the transmitter and the receiver.  ...  These derivations are under the assumption that the channel state information (CSI) is completely known at both the transmitter and the receiver.  ... 
doi:10.1109/jsac.2006.879407 fatcat:qgnhojofife4jbxamfms45b2zu

Fading Channels: InformationTheoretic and Communications Aspects [chapter]

2009 Information Theory  
In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels.  ...  Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and multiuser transmission are examined.  ...  ACKNOWLEDGMENT The authors are grateful to Sergio Verdú for his continuous encouragement and stimulus during the preparation of this paper.  ... 
doi:10.1109/9780470544907.ch22 fatcat:ouk2ihgobzbpvlwsszfbtkcsyu

Fading channels: information-theoretic and communications aspects

E. Biglieri, J. Proakis, S. Shamai
1998 IEEE Transactions on Information Theory  
In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels.  ...  Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and multiuser transmission are examined.  ...  ACKNOWLEDGMENT The authors are grateful to Sergio Verdú for his continuous encouragement and stimulus during the preparation of this paper.  ... 
doi:10.1109/18.720551 fatcat:o44i6h5drrelngwzraykm2dd7e

Dirty-Paper Coding Versus TDMA for MIMO Broadcast Channels

N. Jindal, A. Goldsmith
2005 IEEE Transactions on Information Theory  
We compare the capacity of dirty-paper coding (DPC) to that of time-division multiple access (TDMA) for a multiple-antenna (multipleinput multiple-output (MIMO)) Gaussian broadcast channel (BC).  ...  We investigate the tightness of this bound in a time-varying channel (assuming perfect channel knowledge at receivers and transmitters) where the channel experiences uncorrelated Rayleigh fading and in  ...  ACKNOWLEDGMENT The authors wish to thank Jerry Foschini for his assistance with this work.  ... 
doi:10.1109/tit.2005.846425 fatcat:6n54ul6mevahho7bmz3xfdqcvm

The turbo-fountain

Hrvoje Jenkač, Joachim Hagenauer, Timo Mayer
2006 Transactions on Emerging Telecommunications Technologies  
Two realisations for the Turbo-Fountain are introduced. We show simulation results for the Turbo-Fountain realisations on the AWGN and on fading channels.  ...  Reliable wireless broadcast with asynchronous data access based on fountain coding is investigated.  ...  L-values [9] are obtained after the multiplication with the channel state information L c ¼ 4aðE s =N 0 Þ.  ... 
doi:10.1002/ett.1125 fatcat:a47vadt2lvbhlluhmgutpb45oi

Fundamental Limits in MIMO Broadcast Channels

Babak Hassibi, Masoud Sharif
2007 IEEE Journal on Selected Areas in Communications  
The crucial role of channel state information at the transmitter is emphasized, as well as the emergence of opportunistic transmission schemes.  ...  Index Terms-MIMO broadcast channels, sum-rate capacity, asymptotics, channel state information.  ...  This is referred to as having full channel state information (CSI) at the transmitter. A.  ... 
doi:10.1109/jsac.2007.070907 fatcat:a6fmvqi56jb3nlqypfuf7efqa4

Ergodic Capacity Of Block-Fading Gaussian Broadcast And Multi-Access Channels For Single-User-Selection And Constant-Power

Mohammad Shaqfeh, J.S. Thompson
2009 Zenodo  
Publication in the conference proceedings of EUSIPCO, Glasgow, Scotland, 2009  ...  The authors would also like to thank for the support from the Scottish Funding Council for the Joint Research Institute with the Heriot-Watt University which is a part of the Edinburgh Research Partnership  ...  ACKNOWLEDGEMENTS The work reported in this paper has formed part of the Core 4 Research Program of the Virtual Centre of Excellence in Mobile and Personal Communications, Mobile VCE, www.mobilevce.com,  ... 
doi:10.5281/zenodo.41718 fatcat:mgnbwwu5urethai7ddge6xnvdm

Stable Transmission in the Time-Varying MIMO Broadcast Channel

Adam L. Anderson, James R. Zeidler, Michael A. Jensen
2008 EURASIP Journal on Advances in Signal Processing  
This paper studies the performance of precoding techniques for the multiuser broadcast channel with outdated CSI at the transmitter.  ...  Both linear and nonlinear transmit precoding strategies based on accurate channel state information (CSI) can significantly increase available throughput in a multiuser wireless system.  ...  channel access for multiple users.  ... 
doi:10.1155/2008/617020 fatcat:em655uw5rvdrvp3ajmfahfgzqi
« Previous Showing results 1 — 15 out of 820 results