Results 121 to 130 of about 47,501 (159)

Bit-cooperative coded modulation

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013
A new coded modulation technique, termed bit-cooperative coded modulation (BCCM), is proposed in this paper. By introducing a pseudo-random sequence at the transmitter to systematic low-density parity-check (LDPC) codes, the receiver enjoys the benefits of increased minimum Euclidean distance and the Hamming distance when applying this side-information
Zhiyong Chen, Bin Xia, Hui Liu
openaire   +1 more source

Cooperation and Coding Framework

2009 IEEE International Conference on Communications Workshops, 2009
Exploiting cooperation and coding techniques is a vivid area in current networking research. Unfortunately, implementing and deploying such techniques is often difficult due to their complexity and the required modifications deeply within the protocol stack.
T. Biermann, Z. A. Polgar, H. Karl
openaire   +1 more source

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.
Z. Lin, E. Erkip, A. Stefanov
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Cooperative coding using serial concatenated convolutional codes

IEEE Wireless Communications and Networking Conference, 2005, 2005
The paper presents a novel cooperative coding scheme using punctured serial concatenated convolutional codes (SCCC). We evaluate its performance in terms of frame error rate (FER) under two cooperation protocols: a decode-and-forward protocol in conjunction with automatic repeat request (ARQ), by which the relay sends an acknowledge bit (ACK) back to ...
null Yang Cao, B. Vojcic
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Cooperative coding using concatenated trellis coded modulation

2009 International Conference on Communications, Circuits and Systems, 2009
Coded cooperation is an efficient way to achieve transmit diversity at the mobile unit with single antenna. This paper presents a novel cooperation coding system in use of concatenated trellis coded modulation. Simulation results show that the parallel concatenation of inner and outer encoders of the proposed system provides significant performance ...
null Tao He, null Huawei Chen, null Fanji Meng, null Yuwen Wang   +3 more
openaire   +1 more source

Code design for coordinate interleaved coded cooperation

2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing, 2008
In this paper, code design criteria for coded cooperation systems with coordinate interleaving are derived from pairwise error probability upper bounds. Optimum 4, 8 and 16-state trellis codes are designed by means of exhaustive computer search. The error performances of the new codes evaluated by the computer simulations show their superiority ...
Ozgur Oruc, Umit Aygolu
openaire   +1 more source

Cooperative Coding Using Parallel Concatenated LDPC Codes

2006 IEEE Information Theory Workshop, 2006
When mobiles cannot support multiple antennas due to size or other constraints, cooperative diversity is an efficient way to provide uplink transmit diversity. This paper presents a novel cooperative coding scheme in use of rate-compatible parallel concatenated LDPC codes. We evaluate its performance in terms of bit error rate.
Hong Wen, Liang Zhou, Zhongpei Zhang
openaire   +1 more source

Adaptive Coded Cooperation in Wireless Networks

2008 International Wireless Communications and Mobile Computing Conference, 2008
User cooperation enables single antenna terminals to benefit from spatial diversity by partnering with other users to create a virtual transmit antenna array. A promising form of cooperation is called coded cooperation which integrates cooperation with channel coding, showing great performance gains.
Faisal Alazem, Jean-Francois Frigon, David Haccoun   +2 more
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

Superposition Coded Modulation for Cooperative Communications

2012 IEEE Vehicular Technology Conference (VTC Fall), 2012
A Turbo Trellis-Coded Modulation (TTCM) aided superposition modulation scheme is conceived for a Decode-and-Forward (DAF) based cooperative communication system. More specifically, two source nodes communicate simultaneously with the same destination node via a relay node.
Sun H., Ng S.X., Hanzo L.
openaire   +1 more source