High-energy-efficiency robust precoding method suitable for multi-beam satellite communication system

Abstract

The invention provides a high-energy-efficiency robust precoding method suitable for a multi-beam satellite communication system. The method comprises the following steps: firstly, considering a channel propagation long delay characteristic in a satellite communication system, and representing channel phase uncertainty caused by channel state information feedback delay and the like by using a random variable; secondly, considering the characteristic of limited energy of the satellite communication system, solving mathematical expectation of the user rate about the random variables, dividing the minimum value in the user group by the total power consumption of the group to obtain the energy efficiency of the user group, and modeling a robust precoding design problem as a total power minimization problem under the constraint of the energy efficiency of the user group; and finally, converting an initial total power minimization problem into a series of convex optimization sub-problems foriterative solution through a positive semidefinite relaxation and sequential optimization method, and obtaining a precoding vector of each user group by adopting a Gaussian randomization method. Compared with a traditional precoding method, the high-energy-efficiency robust precoding method provided by the invention has the advantage that the performance and the energy efficiency of a multi-beamsatellite communication system can be remarkably improved.

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...

AI Technical Summary

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

Images