Results 191 to 200 of about 10,192 (231)

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.
Yi Ma 0002, Rahim Tafazolli, Yuanyuan Zhang 0004, Chuyi Qian   +3 more
openaire   +2 more sources

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 0001
openaire   +1 more source

Decode-and-forward cooperation as the distributed encoding and decoding

2010 7th International Symposium on Wireless Communication Systems, 2010
The decode-and-forward relaying is studied as two problems of the distributed encoding and decoding. Specifically, in the first problem, the source and the relay employ the same channel encoding, and the objective is to find how to distribute the decoding complexity between the relay and the destination.
Saif E. A. Alnawayseh, Pavel Loskot
openaire   +1 more source

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
openaire   +1 more source

A Decode-and-Forward Scheme for Multihop Wireless Networks

2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013
In this paper, we propose a Decode-and-Forward (DF) relaying scheme for the multihop transmission in wireless networks, where the information generated by an independent source has to be sent to a far destination based on multiplerelay cooperation. The proposed DF scheme blends together convolutional channel coding with linear combination of blocks of ...
Mikel Hernaez, Iker Alustiza, Pedro M. Crespo, Javier Del Ser   +3 more
openaire   +1 more source

Cooperative Transmission Schemes for Decode-and-Forward Relaying

2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007
We consider a low mobility cellular relaying system downlink where two mobile users are served by two neighboring decode-and-forward relays concurrently using the same frequency channel. We propose two cooperative relaying transmission schemes where each relay can choose proper precoding vectors based on its local channel knowledge to transmit data in ...
Jian Zhao 0013, Marc Kuhn, Armin Wittneben, Gerhard Bauch 0001   +3 more
openaire   +1 more source

On the Spectral Efficiency of Selective Decode-and-Forward Relaying

IEEE Transactions on Vehicular Technology, 2016
Multirelay cooperative relaying enables spatial diversity, often at the expense of spectral efficiency. To alleviate the loss in spectral efficiency due to half-duplex relaying and transmission over orthogonal channels, we propose a novel transmission scheme for selective decode-and-forward (DF) networks.
Hamza Umit Sokun, Halim Yanikomeroglu
openaire   +1 more source

Bit-wise combining for decode-and-forward relays

2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2012
We consider the problem of combining the signals received from a decode-and-forward relay with those received from the source. As an alternative to the high-complexity maximum-likelihood combining strategy, we propose a bit-wise combining strategy in which the received signals are first converted to log-likelihood values before being combined.
Namshik Kim, John R. Barry
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 A. Carrasco, Stéphane Y. Le Goff   +2 more
openaire   +1 more source

Enhanced MRC for Decode-and-Forward Cooperative Diversity Systems

IEEE Transactions on Wireless Communications, 2012
In this letter, we propose a novel enhanced maximal-ratio combining (E-MRC) scheme for multi-branch decode-and-forward (DF) cooperative diversity systems consisting of a source, a destination, and multiple relays. This scheme employs adjustable parameters at the relays and the destination which enable this scheme to appropriately adapt to variations in
Amir Nasri, Robert Schober, Murat Uysal
openaire   +2 more sources