Results 251 to 260 of about 20,715 (264)

Decode and forward based cooperative system for MANETs

2016 IEEE Annual India Conference (INDICON), 2016
In this paper, we propose a decode and forward (DF) based cooperative system with 2 relays for mobile ad-hoc network (MANET). The proposed system includes Orthogonal Frequency Division Multiplexing (OFDM) based physical layer design. Maximum a posteriori probability (MAP) based MIMO detection is performed at relays as well at destination. The diversity
M S JameerAli, T Aloob, Nanda Kishore Chavali   +2 more
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Soft decode and forward improves cooperative communications

6th IEE International Conference on 3G and Beyond (05/11182), 2005
Mobile receivers can benefit from an increased spatial diversity through cooperation. Two relaying techniques are typically used: either amplify and forward (AF) or decode and forward (DF). This contribution presents a new technique, which combines the main advantages of both AF and DF.
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Compressive cooperative communication with decode and forward relay

2016 8th International Conference on Communication Systems and Networks (COMSNETS), 2016
The theory of compressive sensing (CS) is acquiring attraction now a days, as it can reconstruct a sparse signal at a sub-Nyquist sampling rate. Recently CS is being used in communication systems for channel estimation, Massive MIMO, cognitive radio etc. In this paper, CS is using in an overlay cooperative spectrum sharing scheme for decode and forward
Neha Jain, Vivek Ashok Bohara, Anubha Gupta   +2 more
openaire   +1 more source

Adaptive Modulation for Opportunistic Decode-and-Forward Relaying

IEEE Transactions on Wireless Communications, 2011
Orthogonal relay based cooperative communication enjoys distributed spatial diversity gain at the price of spectral efficiency. This work aims at improving the spectral efficiency for orthogonal opportunistic decode-and-forward (DF) relaying through employment of novel adaptive modulation scheme.
Ma, Y, Tafazolli, R, Zhang, Y, Qian, C
openaire   +2 more sources

Power control in decode-and-forward cooperative systems

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08), 2008
In this paper, a decode-and-forward cooperative communication system is considered with errors forwarded by relays. Maximum ratio combining is performed at the destination without considering whether the forwarded symbols from the relays are incorrect.
null Mi Wengang, Tat M. Lok
openaire   +1 more source

Dynamic Decode-and-Forward Relaying using Raptor Codes

IEEE Transactions on Wireless Communications, 2011
Dynamic decode-and-forward (DDF) is a version of decode-and-forward relaying in which the duration of the listening phase at relays is not fixed. In this paper, we investigate half-duplex DDF relaying based on rateless codes. The use of rateless codes allows relays to autonomously switch from listening to the source node to transmitting to the ...
A Ravanshid, L Lampe, J B Huber
openaire   +1 more source

Decode-and-forward relaying technique in UMTS networks

2010 7th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP 2010), 2010
As fading due to multipath propagation is an important issue in wireless systems, diversity techniques are employed in order to reduce the multipath fading effect. Cooperative communication represents a new class of diversity schemes in which multiple nodes equipped with a single antenna cooperate to generate a virtual multiple-antenna transmission ...
Mingkwan Somphruek, Rolando Carrasco, Stephane Le Goff   +2 more
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Outage analysis of opportunistic decode-and-forward relaying

2010 7th International Symposium on Wireless Communication Systems, 2010
In this paper, we investigate a dual-hop opportunistic decode-and-forward relaying scheme where the source may or not be able to communicate directly with the destination. We first derive statistics based on exact probability density function (PDF) of each hop.
Kamel Tourki, Hong-Chuan Yang, Mohamed-Slim Alouini   +2 more
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Decode-and-Forward Cooperative Networks with Relay Selection

2007 IEEE 66th Vehicular Technology Conference, 2007
In this paper, we focus on the decode-and-forward (DF) cooperative networks with relay selection. Many detection schemes have been proposed for the DF; but it has been shown that the cooperative maximum ratio combining (C-MRC) can achieve almost the same performance as the optimum maximum likelihood detector and has a much lower complexity.
Zhihang Yi, Il-Min Kim
openaire   +1 more source

Performance Evaluation of Decode-and-Forward Satellite Relaying

IEEE Transactions on Vehicular Technology, 2015
In this paper, we consider decode-and-forward (DF) relaying of the data of a multiple-antenna-based source Earth station, via a single-antenna-based satellite, to a multiple-antenna-based destination Earth station. The source uses beamforming for transmission of the data, and the destination utilizes the maximal ratio combining for demodulating the ...
openaire   +1 more source