Data transmission method for forward link of high-throughput satellite system

Abstract

The invention discloses a data transmission method for a forward link of a high-throughput satellite system. The data transmission method comprises the following steps: selecting two gateway stations with the best channel quality from a plurality of independent and irrelevant gateway stations on the ground to carry out Alamouti space-time coding; enabling a high-throughput satellite to obtain the satellite-ground link statistical channel state information according to the position information of the user; completing a beam forming scheme design based on a virtual signal to interference plus noise ratio criterion; performing user scheduling according to 1-bit information fed back by each user to obtain an optimal user combination and a beam forming weight vector under the same time-frequency resource condition; enabling the ground gateway station to send the scheduled signal to the high-throughput satellite through the feed link, and enabling the high-throughput satellite to carry out beam forming processing on the received signal and then forward the signal to a corresponding user on the ground. According to the method, the capacity requirement of large-scale access can be effectively met, and the system capacity can be improved under the condition that the system overhead is reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to using the Alamouti space-time coding method and laser technology in the feeder link to communicate with high-throughput satellites, and using the beamforming scheme based on the virtual signal-to-interference-noise ratio criterion in the user link And the user scheduling method including 1-bit feedback is mainly applied to forward link transmission of a high-throughput satellite system in a multi-user scenario. Background technique [0002] Satellite communication is a communication method that uses satellites as space relay stations to provide links between sea, land, air, and mobile users, as well as between ground network and mobile network users. The high-throughput satellite communication system using beamforming technology can generate a large number of narrow spot beams to cover a large ground area with high gain, and adjust the beam shape as needed ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies in the prior art, and provides a data transmission method for the forward link of a high-throughput satellite system, which can effectively meet the capacity requirements of large-scale access. The statistical channel state information mentioned in the present invention is based on The advanced beamforming algorithm and low-complexity user scheduling method can realize the improvement of system capacity while reducing system overhead

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