Results 231 to 240 of about 134,681 (260)

Compressed cooperation in an amplify-and-forward relay channel

2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2015
The 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, Yifan Wang 0006, Jiaru Lin, Lixi Fu   +3 more
openaire   +1 more source

A Practical Differential Receiver for Amplify-and-Forward Relaying

IEEE Wireless Communications Letters, 2014
A 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, Saeed Gazor, Il-Min Kim 0001   +2 more
openaire   +1 more source

Noncoherent Detection in Amplify-and-Forward Relay Systems

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference, 2008
In amplify-and-forward single-relay systems that employ an average relay power constraint, one-shot detection at the destination terminal is not optimal when the channel between the source and relay terminals is unknown. In this work, we derive the maximum-likelihood (ML) block noncoherent detector and show that it can be expressed as a reduced-rank ...
Maria Gkizeli, George N. Karystinos
openaire   +1 more source

Jamming in Dual-Hop Amplify-and-Forward Relaying

IEEE Transactions on Vehicular Technology, 2015
The performance of a dual-hop amplify-and-forward (AF) relaying system in the presence of a jammer is analyzed by obtaining the end-to-end outage probability for the scenario where the system is interference limited and operates in either Nakagami-0.5 or Rayleigh fading environments.
Aydin Behnad, Xianbin Wang 0001
openaire   +1 more source

On Slotted Amplify-and-Forward Cooperative Diversity Schemes

2006 IEEE International Symposium on Information Theory, 2006
All previously proposed amplify-and-forward (AF) and decode-and-forward (DF) schemes do not improve with the number of relays in terms of the diversity-multiplexing tradeoff (DMT) for multiplexing gains r higher than 0.5. In this work, we study the class of slotted amplify-and-forward (SAF) schemes.
Sheng Yang 0001, Jean-Claude Belfiore
openaire   +1 more source

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

Robust Power Allocation for Amplify-and-Forward Relay Networks

2007 IEEE International Conference on Communications, 2007
Relay power allocation has been shown to provide substantial performance gain in wireless relay networks when perfect global channel state information (CSI) is available. In this paper, we consider a more realistic scenario, where such global CSI is subject to uncertainty, and we aim to design robust power allocation protocols for both the coherent and
Tony Q. S. Quek, Moe Z. Win, Hyundong Shin, Marco Chiani   +3 more
openaire   +2 more sources

An architecture for amplify‐and‐forward cooperative systems with real modulations

International Journal of Communication Systems, 2009
AbstractThis 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.
Krikidis, Ioannis A., Krikidis, Ioannis A.   +1 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.
Mohammad Sadegh Fazel, Reza Hoshyar, Rahim Tafazolli   +2 more
openaire   +1 more source

Random DS/CDMA for the amplify and forward relay channel

IEEE Transactions on Wireless Communications, 2009
This paper presents a communication system where point-to-point transmissions are aided by L half-duplex, amplify and forward relays which access a common channel by means of random spreading matrices. During the relaying phase, the source can either remain silent or send new symbols.
David Gregoratti, Xavier Mestre
openaire   +2 more sources