An energy-efficient and robust precoding method for multi-beam satellite communication systems

Abstract

The invention proposes an energy-efficient and robust precoding method suitable for a multi-beam satellite communication system. This method firstly considers the channel propagation delay characteristics in the satellite communication system, and uses random variables to represent the channel phase uncertainty caused by the channel state information feedback delay; The mathematical expectation of the above random variable is calculated by dividing the minimum value in the user group by the total power consumption of the user group to obtain the energy efficiency of the user group, and then the robust precoding design problem is modeled as the total power minimization problem under the energy efficiency constraints of the user group; finally The initial total power minimization problem is transformed into a series of iteratively solved convex optimization subproblems by positive semi-definite relaxation and sequential optimization methods, and the precoding vector of each user group is obtained by using Gaussian randomization method. Compared with the traditional precoding method, the energy efficient and robust precoding method proposed by the present invention can significantly improve the performance and energy efficiency of the multi-beam satellite communication system.

Description

technical field [0001] The invention relates to a satellite communication system precoding method, in particular to an energy-efficient and robust precoding method suitable for a multi-beam satellite communication system. Background technique [0002] With the significant increase in high-throughput requirements, the multi-beam system framework has become the development trend of the next-generation satellite communication system. Multiple beams provide services for ground terminals in a wide coverage area. How to reduce inter-beam interference is an urgent problem to be solved in multi-beam satellite communication systems. In a multi-beam satellite communication system that adopts the same-frequency networking, the purpose of reducing inter-beam interference can be achieved by performing multi-beam joint precoding at the transmitter. In addition, with the dramatic increase in energy consumption in ICT, energy efficiency has become an important consideration in satellite co...

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Problems solved by technology

At the same time, the channel phase uncertainty caused by high propagation delay makes it difficult for the transmitter to obtain actual channel state information, so it is necessary to design a robust precoding method for outdated channel information

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