Results 131 to 140 of about 140,869 (184)

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
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Diversity in relaying protocols with amplify and forward

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489), 2004
We examine a network consisting of one source, one destination and two amplifying and forwarding relays and consider a scenario in which destination and relays can have various processing limitations. For all possible diversity combining schemes at the relays and at the destination, we find diversity order results analytically and confirm our findings ...
Melda Yuksel, Elza Erkip
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
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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
Wan-Jen Huang, Yao-Win Peter Hong, C.-C. Jay Kuo   +2 more
openaire   +1 more source

An Amplify-and-Forward architecture for low spectral efficiencies

2009 IEEE International Symposium on Circuits and Systems, 2009
This paper proposes a simple architecture for half-duplex cooperative systems which use Amplify-and-Forward (AF) as a relay strategy and one-dimensional modulations for source messages. The proposed solution uses the two orthogonal channels of quadrature modulation in order to allow a node to behave simultaneously as a source and a relay. We prove that
Krikidis, Ioannis A., Krikidis, Ioannis A.   +1 more
openaire   +2 more sources

Linear detection for the nonorthogonal amplify and forward protocol

IEEE Transactions on Wireless Communications, 2009
In this paper, we present three new detection schemes for the nonorthogonal amplify and forward (NAF) protocol in a cooperative diversity system based on a multiuser detection approach, namely, a channel inversion type detector, a maximal-ratio combining (MRC) type detector, and a biased maximum likelihood (ML) detector. The decision variables in these
Aakanksha Chowdhery, Ranjan K. Mallik
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 0001, Hoang Duong Tuan   +2 more
openaire   +1 more source