A Satellite Channel Modeling Method Based on Group Delay Effect and Nonlinear Constraints

Abstract

The invention relates to a satellite channel modeling method, particularly discloses a group delay effect and non-linear constraint based satellite channel modeling method which organically combines non-linear and group delay non-linear effects of a high-power amplifier, and solves the problem that channel models in the prior art have low simulation tracking performances of real satellite channels. A satellite channel is innovatively considered to be composed of four parts of a linear channel, a non-linear channel, a group delay channel 1 and a group delay channel 2; each part is approached by a linear part and a no-linear part of a Wiener model respectively, and when the approach process is converged, features of the Wiener model are retained; when the approach process is not converged, a control function is defined as a constraint function of input and output of the non-linear channel for replacing a non-linear function of the Wiener model so as to control convergence of the approach process. Compared with traditional satellite channel models, the group delay effect and non-linear constraint based satellite channel modeling method has the advantages of being capable of increasing a rate of convergence and reducing errors of mean square and good in dynamic tracking performance so as to guarantee satellite communication efficiency and quality.

Description

Technical field [0001] The invention belongs to the technical field of satellite communication, and particularly relates to a satellite channel modeling method that organically combines the nonlinear effects of a high-power amplifier and the nonlinear group delay. Background technique [0002] In satellite communication, communication quality is related to the characteristics of satellite channels. Whether the channel model established according to the satellite channel characteristics is consistent with the actual channel characteristics is the key to affecting the quality of satellite communication. The traditional satellite channel model is regarded as a cascade of the transmission filter, the linear channel model of the high power amplifier and the nonlinear channel model of the high power amplifier, such as figure 1 As shown, the traditional model is based on the nonlinearity of the high-power amplifier, and does not consider the influence of the group delay effect caused by...

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Problems solved by technology

[0008] In order to solve the above problems, the present invention discloses a satellite channel modeling method, which organically combines the nonlinear effect of high power amplifier and group delay nonlinear effect, and solves the analog tracking performance of the channel model in the prior art to the real satellite channel Low problem, effectively improve the quality of satellite communication

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