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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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Design of limiting amplifier models for nonlinear amplify-and-forward distributed estimation
2013 18th International Conference on Digital Signal Processing (DSP), 2013This paper describes the design of limiting amplifier models to be used in the implementation of non-linear amplify-and-forward distributed estimation systems. The use of nonlinear amplifiers in amplify-and-forward distributed estimation can yield significant gains in sensor power efficiency compared to the more conventional linear amplifiers.
Robert W. Santucci +3 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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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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A Practical Differential Receiver for Amplify-and-Forward Relaying
IEEE Wireless Communications Letters, 2014A practical sequence detector of differential phase-shift keying (DPSK) is developed in closed-form for amplify-and-forward (AF) cooperative networks. This detector is applicable for general M-DPSK (M ≥ 2) with arbitrary sequence length N 8 ≥ 1, which includes a single-by-symbol detector as a special case N 8 = 1.
Peng Liu 0015 +2 more
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Subcarrier pairing for amplify-and-forward and decode-and-forward OFDM relay links
IEEE Communications Letters, 2009We 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 0001 +3 more
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Hybrid Decode-Forward Amplify-Forward Relaying with Opportunistic Layered Multicast
2018 10th International Conference on Wireless Communications and Signal Processing (WCSP), 2018In this paper, we propose a hybrid decode-forward & amplify-forward relaying with opportunistic layered multicast (HDAF-OLM) scheme for a cellular system with multiple relays and multiple users. The scheme integrates hybrid decode-forward and amplify-forward with non-orthogonal multiple access transmission (HDAF-NOMA) scheme and layered multicast ...
Yifan Liu, Yang Liu, Guannan Ma
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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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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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