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A condition to the existence of periodic-3 orbit and implication of chaos in a kind of Roseneweig-Macorthur discrete system is presented in the paper, and it's proven in this condition, the periodic-3 orbit of Roseneweig-Macorthur discrete system is not unique, and such researches will have important ecological significances on the prediction of ecological environment.
In order to enhance the transmission performance of the IR-UWB (impulse radio ultra wideband) system, the space-time technology of MIMO (multiple input and multiple output) has been considered. In view of the low power in the UWB mobile terminal, we need to estimate the channel in the receiver when using the space-time code. However, the complexity of the terminal is increased. For this reason, the...
This paper presented a novel method to estimate harmonicspsila parameters with quaternion. First, a kind of quaternion model of harmonic was established. Then, its correlation matrix, a quaternion correlation matrix (QCM), was constructed. Finally, this QCM was decomposed, where quaternion noise subspace was used to estimate harmonicpsilas parameters. Simulations illustrated this special idea and...
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