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This paper describes an efficient coherent demodulation algorithm aiming at the receiver in Terrestrial Trunked Radio (TETRA) communication system. The algorithm proposes frequency offset error twice-estimation and sectioned phase offset compensation to achieve the high precision in carrier synchronization. Odd-even decision is then proposed in the algorithm to avoid signal noise ratio (SNR) loss...
The V.29 fax demodulation principle is studied, the algorithms of carrier synchronization, inverse signal space mapping and the cancellation of redundant data are improved. The improved algorithm is also implemented. Test show that an ideal optimization effect is achieved.
In peer-to-peer networks, The availability of data reduces severely by the node frequent offline, a lot of data transmission service can not carry out because the bandwidth resources extremely limited, there is no a administrator to manage transmission about virus document. To solve these problems, this paper puts forward a method with studying of P2P network model based on data agent memory thought...
This paper is focusing on the neural network based classifier design of modulation types for communication signals. A tree-structured neural network is proposed which could make correct identification among 13 modulation types by the use of comprehensive features, including power spectral features, cyclic spectral features and high-order cumulant features. The tree-structured neural network is a self-organizing,...
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