Results 231 to 240 of about 371,406 (280)

Estimation for amplify-and-forward transmissions with nonlinear amplifiers

2013 Constantinides International Workshop on Signal Processing (CIWSP 2013), 2013
This paper describes the development of a distributed estimation algorithm for amplify-and-forward sensor transmissions with realistic nonlinear amplifier models at the sensors. Specifically, an algorithm is developed that enables distributed estimation with amplifiers operating in the non-linear class AB region. In this system, a digital predistortion
R. Santucci, M.K. Banavar, C. Tepedelenlioglu, A. Spanias   +3 more
openaire   +1 more source

Adaptive Amplify-and-Forward Cooperative Channel

2007 IEEE International Symposium on Information Theory, 2007
In this work, we propose an amplify-and- forward (AF) protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation). The outage probability and the simulation results show that the new Adaptive AF protocol has better performance than the best known AF protocol (
Charlotte Hucher, Ghaya Rekaya-Ben Othman, Jean-Claude Belfiore   +2 more
openaire   +1 more source

Adaptive Amplify-and-Forward Relaying for Cellular Downlink

IEICE Transactions on Communications, 2011
This paper presents an adaptive amplify-and-forward (AF)-type relaying method appropriate for the cellular downlink. The proposed method adaptively selects active relay stations (RSs) based on the path loss between each set of user equipment (UE) and the base station (BS) and that between each RS in order to avoid unnecessary enhancement of inter-cell ...
Kiichi Tateishi, Kenichi Higuchi
openaire   +1 more source

Lifetime Maximization for Amplify-and-Forward Cooperative Networks

2007 IEEE Wireless Communications and Networking Conference, 2007
Joint relay-selection and power-allocation strategies are devised to prolong the lifetime of amplify-and-forward (AF) cooperative networks. Lifetime is defined as the time duration within which the desired signal-to-noise ratio (SNR) at the destination is met with a certain probability. Based on selective relaying, we propose three strategies that take
null Wan-Jen Huang, Y.-W.P. Hong, C.-C.J. Kuo   +2 more
openaire   +1 more source

An amplify-and-forward scheme for cognitive radios

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014
In this paper, we propose an opportunistic amplify-and-forward relaying scheme for a cognitive radio network, which is aimed at allowing a secondary user (SU) to transmit over the same timefrequency slot of a primary user (PU). In our scheme, the SU amplifies and transmits the PU signal it receives, by using as relaying gain the information symbols ...
VERDE, FRANCESCO, Anna Scaglione, GELLI, GIACINTO, Donatella Darsena   +3 more
openaire   +3 more sources

Nonlinear Amplifier Distortion in Cooperative Amplify-and-Forward OFDM Systems

2009 IEEE Wireless Communications and Networking Conference, 2009
This paper studies receiver techniques for nonlinear amplifier distortion compensation in an OFDM relay-assisted cooperative communication system. The system model includes a nonlinear amplifier at the amplify-and-forward relay, modeled as a solid state power amplifier (SSPA).
Victor del Razo, Taneli Riihonen, Fernando Gregorio, Stefan Werner, Risto Wichman   +4 more
openaire   +1 more source

Ressource management for Amplify and Forward and Decode and Forward relaying systems

2010 XIth International Workshop on Symbolic and Numerical Methods, Modeling and Applications to Circuit Design (SM2ACD), 2010
This paper addresses the optimization of ressource allocation based on Decode and Forward (DF) or Amplify and Forward (AF) relaying techniques for packet access Orthogonal Frequency Division Multiple Access (OFDMA) networks. A power allocation quasi-optimal solution with a low complexity has been proposed for the two forwarding techniques.
Wafa Ben Hassen, Afef El Gares, Noureddine Hamdi   +2 more
openaire   +1 more source

Cooperative Phase Sweep Amplify-and-Forward Transmission

2008 IEEE 68th Vehicular Technology Conference, 2008
This work presents a new amplify-and-forward (AF) cooperative multiple input multiple output (MIMO) transmission scheme based on phase sweep transmit diversity. In a single hop cooperative link, the relay node imposes a phase sweep on the signal it receives from the source node.
Geoffrey G. Messier, Sebastian Magierowski, Jean-Francois Bousquet   +2 more
openaire   +1 more source

Amplify-and-forward with partial relay selection

IEEE Communications Letters, 2008
This letter offers a statistical analysis of the basic two-hop Amplify-and-Forward link, where the relay node is selected based on instantaneous and partial knowledge of the channel. In contrast with previously reported work, where relay selection requires global knowledge (2 hops) of the relaying link, the problem considered is interesting in ...
Krikidis, Ioannis A., Thompson, J., McLaughlin, S., Goertz, N., Krikidis, Ioannis A., Thompson, J., McLaughlin, S., Goertz, N.   +7 more
openaire   +2 more sources

Overview of Amplify-and-Forward Relaying

2010
Amplify-and-Forward (AF) is a simple cooperative strategy for ad-hoc networks with critical power constraints. It involves an amplification of the received signal in the analogue domain at the relays without further signal processing. This chapter gives an overview of the basic AF protocols in the literature and discuss recent research contributions in
Ioannis Krikidis, John S. Thompson
openaire   +1 more source