Modulation method for improving satellite communication spectrum efficiency

Abstract

According to a modulation method for improving the satellite communication spectrum efficiency, a communication system with one transmitting antenna and a plurality of receiving antennas is used, thetransmitting end is provided with a traveling wave annular resonant cavity antenna, and the antennas generate OAM waves of different modes; a part of the to-be-sent information is mapped into an orbital angular momentum signal mode, namely an OAM wave of a certain mode, the other part of the to-be-sent information is modulated into a traditional digital modulation symbol through a P-point constellation diagram, an orbital angular momentum signal in a specific mode is used for transmitting the digital modulation symbol at each transmission time, and the modulation process or method comprises the three processes of orbital angular momentum mode modulation mapping, the orbital angular momentum mode detection and the digital modulation and demodulation. According to the present invention, thenew dimension of the orbital angular momentum is added in satellite communication transmission, the frequency spectrum efficiency is improved, and due to the orthogonality between the orbital angularmomentum signals of different modes, the influence of inter-channel interference is avoided, and the safety of information transmission can be enhanced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a modulation method for improving the frequency spectrum efficiency of satellite communication, which uses orbital angular momentum to provide a new degree of freedom for wireless communication in the satellite communication scene. Background technique [0002] Due to the rapid development of wireless communication technology, the contradiction between the increasing demand for wireless communication and the limited spectrum resources has become increasingly prominent. How to improve spectrum efficiency under the condition of limited spectrum resources has become a hot spot in wireless communication research. According to classical electromagnetic theory, in addition to having linear momentum parallel to the direction of propagation, electromagnetic waves also have angular momentum perpendicular to the direction of propagation. Orbital Angular Momentum (OAM) is a part of th...

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Problems solved by technology

[0005] Purpose of the invention: In the satellite communication scenario, if multiple antennas are arranged on the satellite, the physical characteristics that require at least a half-wavelength safety distance between the antennas will conflict with the smaller physical space and antenna hardware size on the satellite, and because the satellite-ground The propagation distance between antennas is too long, and the diversity gain brought by multiple antennas will be greatly reduced due to the influence of fading channels. Therefore, based on this scenario, a communication system with only one transmitting antenna and multiple receiving antennas is used; in order to overcome the inability to use Insufficient of the additional gain provided by the traditional spatial modulation technology, the present invention proposes a modulation method for improving the spectral efficiency of satellite communication, which utilizes the orthogonality between orbital angular momentum signals of various modes to improve the spectral efficiency of satellite communication

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