Results 241 to 250 of about 371,406 (280)

MISO Amplify Forward scheme and its viability

2012 International Conference on Computing, Networking and Communications (ICNC), 2012
In this paper, we consider a MISO equivalent of a three node cooperative communication system as described in [1] and compare its energy efficiency with a pure relaying scheme. Specifically, we first quantify the transmit energy required to maintain a target error probability at the destination in an Amplify Forward (AF) based MISO scheme.
Narayanan Krishnan, Bala Natarajan
openaire   +1 more source

Performance of Untrusted Amplify-and-Forward Relaying

2013 4th International Conference on Intelligent Systems, Modelling and Simulation, 2013
In this paper, we analyze the secrecy outage performance of amplify-and-forward (AF)-based relay networks consisting of a source, a destination, and an untrusted relay, where each terminal has a single antenna and operates in a half-duplex mode. In this network, the common message is transmitted through the relay-path, and the private message is ...
null MinChul Ju, null Do-Hoon Kim
openaire   +1 more source

Relay-Aided Amplify-and-Forward Powerline Communications

IEEE Transactions on Smart Grid, 2013
Powerline communications (PLC) is a favorable technique for many smart grid applications. By transmitting information over the existing powerline infrastructure, PLC has the benefit of low deployment cost. However, due to low transmit power, limited bandwidth, and harsh channel conditions, reliable long-distance and high-capacity PLC is challenging ...
Xilin Cheng, Rui Cao, Liuqing Yang
openaire   +1 more source

Amplify-Forward and Decode-Forward: The Impact of Location and Capacity Contour

MILCOM 2005 - 2005 IEEE Military Communications Conference, 2006
Successful message relay, or the quality of the inter-user channel, is critical to fully realize the cooperative benefits promised by the theory. This in turn points out the importance of the relative location of the users. This paper investigates the impact of the location on the system capacity and outage probability for both amplify-forward (AF) and
null Meng Yu, null Jing Li, H. Sadjadpour   +2 more
openaire   +1 more source

Energy Efficiency of Cooperative SIMO Schemes -Amplify Forward and Decode Forward

2009 Proceedings of 18th International Conference on Computer Communications and Networks, 2009
In this paper, we quantify and compare the en- ergy efficiency of Amplify-and-Forward (AF) and Decode-and- Forward (DF) schemes on a basic three node cooperative network. Total energy is calculated considering circuit energy as well as transmission energy.
Narayanan Krishnan, Balasubramaniam Natarajan   +1 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

Non-orthogonal Amplify-and-Forward for block-fading channels

2008 IEEE International Symposium on Information Theory, 2008
In this paper, we deal with the amplify-and-forward (AF) cooperative strategy in slot-based block-fading environments. In contrast with previous schemes which assume a constant channel during the cooperative frame (several slots), here, we relax this constraint and assume a classical quasi-static block-fading channel (constant for one slot).
Krikidis, Ioannis A., Thompson, J., McLaughlin, S., Goertz, N., Krikidis, Ioannis A., Thompson, J., McLaughlin, S., Goertz, N.   +7 more
openaire   +2 more sources

Flexible Amplify and Forward Relaying Protocol with Optimized Duplexing

VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009
In this paper we propose a novel flexible amplify and forward (AF) relaying protocol with different duplexing ratios. We show that the average throughput can be considerably improved by properly adjusting the duplex ratio. Here it is considered that the transmitted and received channel state information (CSI) are available at the relay.
Fazel M.S., Hoshyar R., Tafazolli R.
openaire   +1 more source

Energy efficiency contours for amplify-and-forward and decode-and-forward cooperative protocols

2012 8th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2012
In this paper we compare the energy efficiency of different cooperative schemes by means of energy efficiency contours. We consider a three-nodes cooperative scenario, employing either the amplify-and-forward (AF) or the decode-and-forward (DF) protocol.
Marcos Tomio Kakitani, Richard Demo Souza, Muhammad Ali Imran   +2 more
openaire   +1 more source

Subcarrier pairing for amplify-and-forward and decode-and-forward OFDM relay links

IEEE Communications Letters, 2009
We consider a two-hop relay link in which orthogonal frequency division multiplexing (OFDM) is used on both hops. Under a joint sum-power constraint, our aim is to allocate power over subcarriers on the two hops such that the instantaneous rate of the relay link is maximized.
Yong Li, Wenbo Wang, Jia Kong, Mugen Peng   +3 more
openaire   +1 more source