Results 231 to 240 of about 11,926 (254)

Joint decode/compress and forward based cooperative multiple access

2012 20th Signal Processing and Communications Applications Conference (SIU), 2012
In this paper, we develop encoding and decoding strategies for a two user cooperative multiple access channel, based on the joint use of decode-forward and compress-forward techniques. We derive the resulting achievable rate expressions. We compare our results with some known rate regions for bidirectional cooperation, and demonstrate through ...
Onur Kaya
exaly   +2 more sources

Scalar and Vector Compress and Forward for the Two Way Relay Channels

2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016
Both scalar and vector quantization are studied when Compress and Forward (CF) is performed in the Two Way Relay Channels. The optimization schemes of these two kinds of quantizers aiming to maximize the sum rate are proposed. The optimization schemes are a combination of the Information Bottleneck (IB) method and the Bi- Section method.
Volker Kuehn
exaly   +2 more sources

Decode-compress and forward relay: AWGN and constellation constrained channels

2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2017
Even though there exists a lot of different transmission techniques, the capacity of the general relay channel is still unknown. This paper shows that combining decode-and-forward (DF) with compress-and-forward (CF) can have a performance advantage over each of the two techniques individually.
Ahmed Attia Abotabl, Aria Nosratinia
openaire   +1 more source

Path compression in forwarding-based reliable mobile agent communications

2003 International Conference on Parallel Processing, 2003. Proceedings., 2003
We concern with the design of efficient algorithms for mobile agent communications. We first describe a novel mailbox-based scheme for flexible and adaptive message delivery in mobile agent systems and a specific adaptive protocol derived from the scheme. Then we present the design and verification of a path compression and garbage collection algorithm
Jiannong Cao 0001, Liang Zhang 0027, Xinyu Feng 0001, Sajal K. Das 0001   +3 more
openaire   +1 more source

On the generalization of decode-and-forward and compress-and-forward for Gaussian relay channels

2011 IEEE Information Theory Workshop, 2011
In this paper, the generalization of the decode-and-forward (DF) and compress-and-forward (CF) relaying schemes is studied for the case in which Gaussian codebooks are used for signalling over scalar Gaussian memoryless channels. Three SNR regions are identified wherein the generalized DF-CF scheme reduces to either the DF or the CF scheme. In addition,
Ramy Gohary, Halim Yanikomeroglu
exaly   +2 more sources

Compress-and-forward strategy for the relay broadcast channel with confidential messages

2016 IEEE International Conference on Communications Workshops (ICC), 2016
In this paper, we re-visit the relay broadcast channel with confidential messages (RBC-CM) by considering a compress-and-forward (CF) inner bound on the capacity-equivocation region of the RBC-CM. This CF inner bound is further explained via a degraded Gaussian example, and we show that in some particular cases, the CF strategy performs better than the
Zheng Ma
exaly   +2 more sources

Achievable rate regions for broadcast channels with compress-and-forward relaying

2012 46th Annual Conference on Information Sciences and Systems (CISS), 2012
The achievable rate regions are studied for the broadcast systems with relay links via the compress-and-forward strategy. In many cases, we can benefit more from compress-and-forward relaying in broadcast channels than from decode-and-forward relaying. In particular, we can achieve physical layer security when using the compress-and-forward scheme.
exaly   +2 more sources

A layered detect-compress-and-forward coding scheme for the relay channel

2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2017
We develop a practical layered detect-compress-and-forward (LDCF) coding framework for a three-node relay network. Assuming all transmissions to be mapped to Quadrature Amplitude Modulation (QAM) constellations, the LDCF framework at the relay utilizes maximum-likelihood detection, followed by a multi-level convolutional coding structure to achieve ...
Fawad Ud Din, Jawwad Nasar Chattha, Irfan Ullah, Momin Uppal   +3 more
openaire   +1 more source

Compress-and-Forward Rates for the Gaussian Relay with ISI and Colored Noise

2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010
The achievable rate of a relay channel with inter- symbol interference and additive colored Gaussian noise is examined under an input power constraint and the compress-and-forward (CF) strategy at the relay. Using classical techniques, it is shown that the circular degraded relay channels is equivalent to that of the linear one in the limit of infinite
Urbashi Mitra, Chiranjib Choudhuri
openaire   +1 more source

Compress-and-Forward Relaying: Prototyping and Experimental Evaluation Using SDRs

2016 IEEE 84th Vehicular Technology Conference (VTC-Fall), 2016
This paper presents a prototype implementation and experimental performance evaluation of compress- and-forward (CF) relaying using software-defined radios. Under QPSK transmissions from all nodes, the relay demodulates the received signal before applying distributed joint source-channel coding (DJSCC) implemented with the help of an off-the- shelf ...
Irfan Ullah, Fawad Ud Din, Jawwad Nasar Chattha, Momin Uppal   +3 more
openaire   +1 more source