Results 251 to 260 of about 1,255,320 (283)

Cooperative Coding for OFDM Systems

Wireless Personal Communications, 2007
In this paper, we study Orthogonal Frequency Division Multiplexing (OFDM) systems with cooperative coding over frequency selective Rayleigh fading channels. We derive the pairwise error probability (PEP) for the block-fading OFDM channel model. We use the derived PEP to get an upper bound on the frame error probability for the coded cooperative OFDM ...
Jerry C. H. Lin, Andrej Stefanov
openaire   +1 more source

Molecular Code for Cooperativity in Hemoglobin

Science, 1992
Although tetrameric hemoglobin has been studied extensively as a prototype for understanding mechanisms of allosteric regulation, the functional and structural properties of its eight intermediate ligation forms have remained elusive. Recent experiments on the energetics of cooperativity of these intermediates, along with assignments of their ...
G K, Ackers, M L, Doyle, D, Myers, M A, Daugherty   +3 more
openaire   +2 more sources

Cooperative regions and partner choice in coded Cooperative systems

IEEE Transactions on Communications, 2006
User cooperation is an efficient approach to obtain diversity in both centralized and distributed wireless networks. In this paper, we consider a coded cooperative system under quasi-static Rayleigh fading and investigate the partner-choice problem.
Zinan Lin 0003, Elza Erkip, Andrej Stefanov   +2 more
openaire   +3 more sources

Cooperative Concatenated Coding for Wireless Systems

2007 IEEE International Conference on Communications, 2007
Cooperative transmission has been of growing interest recently where users take advantage of each other's resources for better overall performance. In this paper, coded cooperation for wireless networks is considered and a novel cooperative concatenated coding strategy is proposed.
Ernest S. Lo, Khaled Ben Letaief
openaire   +6 more sources

Source and Channel Coding for Cooperative Relaying

IEEE Transactions on Information Theory, 2005
We consider the end-to-end distortion achieved by a half-duplex relay system where a continuous amplitude source is transmitted over a quasi-static Rayleigh fading channel. We investigate layered source coding (LS) where different source layers are sent at different times.
Deniz Gündüz, Elza Erkip
openaire   +3 more sources

Coded cooperation using LDPC codes

2009 Global Mobile Congress, 2009
In this paper, a novel scheme of coded cooperation using LDPC codes is presented. Two decoding methods are proposed. A simple upper bound of this scheme is introduced based on the union bound. The performance of these two methods is evaluated and compared by simulation.
Dongfeng Zhao, Daoben Li
openaire   +1 more source

Cooperative Source Coding with Encoder Breakdown

2007 IEEE International Symposium on Information Theory, 2007
This paper provides an inner bound to the rate- distortion region of a source coding setup in which two encoders are allowed some collaboration to describe a pair of discrete memoryless sources. We further require some robustness in case one of the encoders breaks down. This is modeled by having a second decoder, observing the messages from only one of
Vasudevan, Dinkar, Perron, Etienne
openaire   +2 more sources

Cooperative Multiple Trellis Coded Modulation

MILCOM 2006, 2006
In this paper, we consider the design of cooperative multiple trellis coded modulation (CMTCM) schemes over Rayleigh fading channels. We design cooperative multiple trellis codes using asymmetric constellations that provide significant gains over non-cooperative coded modulation without sacrificing the data rate and bandwidth consumption.
Jialing Li, Andrej Stefanov
openaire   +2 more sources

Fountain codes based partial cooperation in cooperative communications

Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, 2010
To improve the throughput performance without feedback channel, a partial cooperation scheme based on fountain codes is proposed in this paper. Compared with the incremental relaying where the signal is retransmitted in fixed or selective relay and fed back to the source from the destination, the proposed scheme only requires the partner to offer ...
Jing (Jonas) Yang, Jianping An, Xiangming Li, Lei Yuan 0002, Nan (Jonas) Yang   +4 more
openaire   +1 more source

Network coded noncoherent cooperative communications

2014 22nd Signal Processing and Communications Applications Conference (SIU), 2014
In recent years, network coding has received significant attention as an innovative approach that improves the spectral efficiency of wireless communication systems. The Multiple Access Relay Channel (MARC) where multiple users communicate with a common destination via a relay, is one of the important network coding applications in wireless cooperative
Muhammet Ali Karabulut, Haci Ilhan, Özgür Özdemir   +2 more
openaire   +3 more sources