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Using co-integration and Granger causality test, based on the data of 1985-2008, discusses the relationship between Chinese civil aviation and economic. The results show that there is a stability positive relationship between the development of civil aviation and economic in the long term. Creating error model to illustrate the dynamic equilibrium exists of them. Granger causality test shows that...
The traditional direct digital frequency synthesizer (DDFS) based on a lookup table has very high complexity. This paper describes a low complexity DDFS using smaller lookup table and with minimum additional hardware. The lookup table for sine/cosine functions is split into a coarse-precision ROM and a fine-precision ROM. Approximation of fine-precision ROM and application of shift registers are introduced...
Orthogonal frequency division multiplexing (OFDM) systems are highly sensitive to ICI caused by carrier frequency errors, so reliable time and frequency synchronization is crucial for the system. In this paper, a new method combined DA (PN estimation) and NDA (ML estimation) method to do frequency synchronization in frequency domain is proposed with large estimation range. Simulation and performance...
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