Results 221 to 230 of about 134,511 (264)
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Amplify-and-forward with full-duplex relay selection
2012 IEEE International Conference on Communications (ICC), 2012This 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. +5 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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Overview of Amplify-and-Forward Relaying
2010Amplify-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
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On the Error Exponent of Amplify and Forward Relay Networks
IEEE Communications Letters, 2011In this letter we derive the exact random coding error exponent of a dual hop amplify and forward (AF) relay network with channel state information (CSI) assisted ideal relay gain. Numerical results have been presented, which provide insight about the performance tradeoff between the error exponent and the data rate of the network.
Bappi Barua +3 more
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Cooperative Amplify-and-Forward with Trellis Coded Modulation
2009 IEEE Wireless Communications and Networking Conference, 2009In a cooperative communication network, individual users are encouraged not only to transmit their own data, but also relay other user's data. This relaying transmission creates spatial diversity to combat the effect of individual severe fading and path loss.
Li Chen 0013 +3 more
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On the Power Allocation for Cooperative Amplify-and-Forward Transmission
2007 IEEE 66th Vehicular Technology Conference, 2007In this paper, efficient power allocation strategy for user cooperative transmission using amplify-and-forward (AF) approach is investigated. Power allocation is solved by finding the desirable ratio of power used for cooperative- information transmission to total power in an attempt to minimize bit error rate (BER) with a constraint of fixed total ...
Lian Zhao, Zaiyi Liao
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Cooperative Phase Sweep Amplify-and-Forward Transmission
2008 IEEE 68th Vehicular Technology Conference, 2008This 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 +2 more
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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), 2012In 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 +2 more
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MISO Amplify Forward scheme and its viability
2012 International Conference on Computing, Networking and Communications (ICNC), 2012In 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
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Distributed Amplify-and-Forward with Ring-TCM Codes
2010 7th IEEE Consumer Communications and Networking Conference, 2010This paper proposes a new distributed Amplify-and-Forward (AF) scheme which is integrated with the Ring-Trellis Coded Modulation (TCM) codes in order to achieve both high spectral efficiency and large diversity gain. In the distributed AF scheme, more users cooperate with each other.
Li Chen 0013 +2 more
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