Large-scale MIMO satellite mobile communication downlink transmission method and system
A technology of satellite mobile communication and transmission method, applied in transmission systems, radio transmission systems, electrical components, etc., can solve the problems of limited volume, weight and power, low computational complexity of precoding vectors, etc. Speed performance, reduced computational complexity, and easy-to-obtain effects
Active Publication Date: 2020-06-05
SOUTHEAST UNIV
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In addition, due to the limited size, weight and power of the satellite payload, the precoding vector should also have low computational complexity
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[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0042] Such as figure 1 As shown, the massive MIMO satellite mobile communication downlink transmission method disclosed in the example of the present invention is applied to a satellite or a gateway station associated with a satellite, wherein the satellite is configured with an antenna array, and multiple antennas or a single antenna ar...
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The invention discloses a large-scale MIMO satellite mobile communication downlink transmission method and a large-scale MIMO satellite mobile communication downlink transmission system with maximum reachability and rate. A satellite or a gateway station calculates a precoding vector corresponding to each user terminal through an iterative algorithm by using statistical channel information of eachuser terminal according to traversal reachability and rates of all users or an upper bound maximization criterion of all the users; downlink precoding transmission is carried out by using the obtained vector. According to the iterative algorithm, a precoding vector design problem is converted into a multi-times convex optimization sub-problem, a precoding vector is obtained by iteratively solvingthe convex optimization sub-problem, or the convex optimization sub-problem is converted into a Lagrange multiplier optimization problem, a Lagrange multiplier is iteratively solved, and then the precoding vector is calculated. And the user terminal performs frequency and time compensation on a received signal by utilizing Doppler frequency shift caused by satellite movement and minimum propagation time delay of long-distance propagation. According to the invention, the reachability and rate performance of a satellite mobile communication system can be improved, and the calculation complexityis relatively low.
Description
technical field [0001] The invention relates to a satellite mobile communication downlink transmission method and system configured with an antenna array, in particular to a satellite mobile communication downlink transmission method and system utilizing massive MIMO technology. Background technique [0002] In recent years, land mobile communication has achieved great success, and the most representative land 5G technology has entered the commercial stage. However, due to huge construction costs, many users still cannot access communication networks in remote mountainous areas, deserts, and sea areas. In order to truly realize global seamless coverage, satellite mobile communication systems using high-orbit satellites, medium-orbit satellites and low-orbit satellites have attracted widespread attention. [0003] Massive multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) technology is one of the important technologies of 5G. By equipping the base station...
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IPC IPC(8): H04B7/0413H04B7/0456H04B7/185
CPCH04B7/0413H04B7/0456H04B7/1851H04B7/18513
Inventor 高西奇李科新尤力王家恒王闻今
Owner SOUTHEAST UNIV