Satellite-ground joint beam forming and power distribution method based on non-orthogonal multiple access technology

Abstract

The invention discloses a satellite-ground joint beam forming and power distribution method based on a non-orthogonal multiple access technology (NOMA), and the method comprises the steps that a satellite communication sub-network serves a plurality of ground stations, a ground cellular sub-network serves a plurality of cellular users, and two sub-networks achieve the spectrum sharing; firstly, anNOMA technology is adopted in the ground cellular sub-network, and a multi-user clustering method is provided based on the correlation of channels among cellular users and the difference of channel gains; secondly, under the conditions that the user service quality is guaranteed and the transmitting power of a satellite and a base station is limited, the optimization problem of sum rate maximization of the whole system is established; and, the non-convex problem is converted into a convex optimization problem by adopting an S-Procedure and Taylor expansion method, and further the optimal beamforming weight vector and the power distribution factor of the satellite and the base station are obtained by utilizing an iterative penalty function method. According to the method, the beam formingtechnology and the non-orthogonal multiple access technology are combined, and a technical scheme is provided for improving the effectiveness of satellite-ground fusion network information transmission.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a satellite-ground joint beam forming and power distribution method based on non-orthogonal multiple access technology. Background technique [0002] The coverage of ground mobile communication is relatively narrow and will be affected by various factors such as terrain factors. Satellite communication covers a wide range and is not easily affected by the geographical environment. It can achieve good communication effects whether it is oceans, plateaus or basins, and has played a huge role in communication. The satellite-ground fusion network combines the respective advantages of the ground network and the satellite network, takes advantage of the advantages of large capacity and high transmission rate of the ground network, and combines the characteristics of the satellite network with wide coverage and flexible communication services to form an efficient fusion ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the system energy often consumes too much

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