Results 251 to 260 of about 371,406 (280)

Performance of Amplify-and-Forward and Decode-and-Forward Relays in LTE-Advanced

2009 IEEE 70th Vehicular Technology Conference Fall, 2009
Current broadband wireless networks are characterized by large cell sizes. Yet, even in advanced networks, users on the cell edge will face relatively low Signal-to- Interference-plus-Noise-Ratio (SINR). An attractive solution for this problem is provided by multi-hop technologies.
Abdallah Bou Saleh, Simone Redana, Bernhard Raaf, Taneli Riihonen, Jyri Hamalainen, Risto Wichman   +5 more
openaire   +1 more source

Robust Power Allocation for Amplify-and-Forward Relay Networks

2007 IEEE International Conference on Communications, 2007
Relay power allocation has been shown to provide substantial performance gain in wireless relay networks when perfect global channel state information (CSI) is available. In this paper, we consider a more realistic scenario, where such global CSI is subject to uncertainty, and we aim to design robust power allocation protocols for both the coherent and
T. Q. S. Quek, H. Shin, M. Z. Win, CHIANI, MARCO   +3 more
openaire   +2 more sources

Is amplify-and-forward practically better than decode-and-forward or vice versa?

Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005., 2006
The paper evaluates the relative merits of amplify-and-forward (AF) and decode-and-forward (DF), the two basic modes of cooperative communications, in practical systems. Specifically, the paper considers the case where the two user channels are slow fading with similar channel qualities and the inter-user channel is some 10 dB better.
null Meng Yu, null Jing Li
openaire   +1 more source

Design of limiting amplifier models for nonlinear amplify-and-forward distributed estimation

2013 18th International Conference on Digital Signal Processing (DSP), 2013
This paper describes the design of limiting amplifier models to be used in the implementation of non-linear amplify-and-forward distributed estimation systems. The use of nonlinear amplifiers in amplify-and-forward distributed estimation can yield significant gains in sensor power efficiency compared to the more conventional linear amplifiers.
Robert Santucci, Mahesh K. Banavar, Andreas Spanias, Cihan Tepedelenlioglu   +3 more
openaire   +1 more source

Amplify-and-forward with full-duplex relay selection

2012 IEEE International Conference on Communications (ICC), 2012
This paper focuses on the relay selection problem in amplify-and-forward (AF) cooperative communication with full-duplex (FD) operation. Different relay selection schemes assuming the availability of different instantaneous information are studied. We consider an optimal relay selection that maximizes the instantaneous FD channel capacity and requires ...
Krikidis, Ioannis A., Suraweera, H. A., Yuen, C., Krikidis, Ioannis A., Suraweera, H. A., Yuen, C.   +5 more
openaire   +2 more sources

Beamforming in Nonorthogonal Amplify-and-Forward Relay Networks

IEEE Transactions on Vehicular Technology, 2011
This paper considers wireless amplify-and-forward (AF) relay networks in which the source communicates with the relays and destination in the first phase and the relays simultaneously forward signals to the destination in the second phase over uncorrelated Rayleigh fading channels.
Tung T. Pham, Ha H. Nguyen, Hoang D. Tuan   +2 more
openaire   +1 more source

Multistage cooperative broadcast using amplify-and-forward relays

2010 - MILCOM 2010 MILITARY COMMUNICATIONS CONFERENCE, 2010
In this work we study the propagation of the signal in a cooperative network where a single source message is retransmitted by multiple stages (levels) of relays. Relays are assumed to have limited computational abilities and hence adopt the amplify-and-forward scheme.
Bhargava Yammanuru, Birsen Sirkeci-Mergen   +1 more
openaire   +1 more source

Delay-tolerant STBC for both amplify-and-forward and decode-and-forward cooperative networks

2008 IEEE International Symposium on Information Theory, 2008
Distributed space-time code constructions are presented that are suitable for asynchronous cooperative networks using different cooperation strategies. The codes presented herein may be used with either an amplify-and-forward or a decode-and-forward protocol, achieving in either scenario full spatial diversity despite arbitrary timing offsets among ...
A. Roger Hammons, Mohamed Oussama Damen
openaire   +1 more source

Older adult participation in cancer clinical trials: A systematic review of barriers and interventions

Ca-A Cancer Journal for Clinicians, 2021
Mina S Sedrak, Rachel A Freedman, Aminah Jatoi   +2 more
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Advances in the development of personalized neoantigen-based therapeutic cancer vaccines

Nature Reviews Clinical Oncology, 2021
Patrick A Ott
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