Data signal transmission method of satellite communication

Abstract

The invention provides a satellite communication uplink data signal transmission method, comprising the steps of: forming a standard rate VCDU data unit according to the uplink transmission rate of the data signal; performing convolution on the data signal of each VCDU data unit through a scrambling code generating function Product scrambling; use convolutional codes to perform convolutional encoding on the scrambled data signals; generate channel frames from the convolutionally encoded data signals, and perform spread-spectrum encoding on the channel frames; spread-spectrum encoded spreading codes The stream is pulse-modulated to generate a pulse data signal; the pulse data signal is transmitted uplink through the uplink channel. The present invention takes into account the balance between improving the system capacity and reducing the complexity of signal processing, not only can ensure the communication command, effectively improve the communication capacity of the system, but also can reasonably select the communication frequency, and reduce the interference effect between various systems.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a data signal transmission method of satellite communication. Background technique [0002] Satellite communication is a communication method that uses satellites as repeaters to realize long-distance communication on the ground. Compared with terrestrial communication systems, satellite communication systems have the advantages of wide signal coverage area, long communication distance, available frequency bandwidth, large communication capacity and stable communication lines, etc., and have been widely used. [0003] At present, due to the limitation of spectrum resources, satellite communication generally adopts the FDMA (Frequency Division Multiple Access) system alone, thereby increasing the number of available code channels. [0004] However, the FDMA system has some additional overhead: 1) RF design to deal with the spectral density of the transmitted signa...

AI Technical Summary

Problems solved by technology

[0006] 1. The transmit power spectral density significantly exceeds the standard, making terminal certification and further application and promotion difficult;

[0007] 2. There is almost no anti-interference ability, and reliable communication cannot be guaranteed on the VHF frequency band;

[0008] 3. The processing power on the star has not been significantly reduced, and it is still facing more complex channel management on the star

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