Results 211 to 220 of about 139,761 (263)
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Adaptive Amplify-and-Forward Cooperative Channel
2007 IEEE International Symposium on Information Theory, 2007In 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 +2 more
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Amplify-and-forward with partial relay selection
IEEE Communications Letters, 2008This 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. +7 more
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Diversity in relaying protocols with amplify and forward
GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489), 2004We 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
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Beam Selection and Tracking for Amplify-and-Forward Repeaters
2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring), 2022Mobile network operators constantly have to upgrade their cellular network to satisfy the public's hunger for increasing data capacity. However, regulatory limits regarding allowed electromagnetic field strength on existing cell sites often limit or prevent the installation of new cells on additional frequency bands. Further densifying the radio access
Adrian Schumacher +2 more
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Lifetime Maximization for Amplify-and-Forward Cooperative Networks
2007 IEEE Wireless Communications and Networking Conference, 2007Joint 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 +2 more
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An Amplify-and-Forward architecture for low spectral efficiencies
2009 IEEE International Symposium on Circuits and Systems, 2009This 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. +1 more
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Beamforming in Nonorthogonal Amplify-and-Forward Relay Networks
IEEE Transactions on Vehicular Technology, 2011This 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 +2 more
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Multiple-Access Capabilities of Amplify-and-Forward Relaying
2015 IEEE Global Communications Conference (GLOBECOM), 2014This paper is concerned with the performance of a gateway connecting a group of independent users to their destinations and employ the random slotted- Aloha type protocol. The users are isolated from their destinations and the only way to communicate with their destinations is through the common gateway which acts as a blind amplify and forward relay ...
Abdurrahman Alfitouri +1 more
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Outage optimality of opportunistic amplify-and-forward relaying
IEEE Communications Letters, 2007In this paper, we show that optimal selection and transmission of a single relay among a set of multiple amplify-and-forward (AF) candidates minimize the outage probability (i.e., outage-optimal) and outperform any other strategy that involves simultaneous transmissions from more than one AF relay under an aggregate power constraint.
Moe Z. Win, Hyundong Shin, M Z Win
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Compressed cooperation in an amplify-and-forward relay channel
2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2015The theory of compressed sensing (CS) is very attractive in that it is possible to reconstruct sparse signals with a sub-Nyquist sampling rate. Recently many researches have applied CS as the channel code, and show its great potential in communication systems. This paper studies the compressed cooperation in an amplify-and-forward (CC-AF) relay channel,
Wenbo Xu 0003 +3 more
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