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5 papers · 1 filter
Average Entropy Functions
Qi Chen, Chen He, Lingge Jiang +1
The closure of the set of entropy functions associated with n discrete variables, Gammar*n, is a convex cone in (2n-1)- dimensional space, but its full characterization remains an…
Fast Cycle Frequency Domain Feature Detection for Cognitive Radio Systems
Shan Da, Gan Xiaoying, Chen Hsiao-Hwa +1
In cognitive radio systems, one of the main requirements is to detect the presence of the primary users' transmission, especially in weak signal cases. Cyclostationary detection is…
End-to-End Outage Minimization in OFDM Based Linear Relay Networks
Xiaolu Zhang, Meixia Tao, Wenhua Jiao +1
Multi-hop relaying is an economically efficient architecture for coverage extension and throughput enhancement in future wireless networks. OFDM, on the other hand, is a spectrally…
A Projection Method for Derivation of Non-Shannon-Type Information Inequalities
Weidong Xu, Jia Wang, Jun Sun
In 1998, Zhang and Yeung found the first unconditional non-Shannon-type information inequality. Recently, Dougherty, Freiling and Zeger gave six new unconditional non-Shannon-type…
The PBD-Closure of Constant-Composition Codes
Yeow Meng Chee, Alan C. H. Ling, San Ling +1
We show an interesting PBD-closure result for the set of lengths of constant-composition codes whose distance and size meet certain conditions. A consequence of this PBD-closure re…