Large-Scale MIMO Satellite Communication Spatial User Grouping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing satellite mobile communication systems face limitations in power and spectrum resource multiplexing ability due to their traditional multi-color reuse multi-beam communication architecture, which hinders efficient global coverage and high-speed data transmission.
Innovation Solution
A large-scale MIMO satellite mobile communication method is implemented, using spatial angle information to group users into space division user groups, and calculating downlink and uplink precoding vectors based on statistical channel information to optimize resource allocation and dynamic transmission processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional multi-color reuse multi-beam communication architecture is used, then global coverage is achieved, but power efficiency and spectrum resource multiplexing ability are limited
Solution Approach 1:
The patent segments users into different groups based on spatial angle information, creating space division user groups. This segmentation allows different user groups to reuse the same time-frequency resources through spatial separation, thereby improving spectrum resource multiplexing ability while maintaining power efficiency through targeted beamforming.
Solution Approach 2:
The patent introduces spatial dimension as an additional resource dimension by utilizing spatial angle information and large-scale antenna arrays. This transforms the traditional two-dimensional resource allocation (time and frequency) into a three-dimensional allocation (adding spatial dimension), enabling users in different spatial directions to share the same time-frequency resources, thus improving spectrum multiplexing ability.
2Productivity
If traditional multi-color reuse multi-beam communication architecture is used, then communication service is provided, but spectrum resource multiplexing ability is limited
Solution Approach 1:
The patent merges multiple user communications into the same time-frequency resources by exploiting spatial separation. Through large-scale antenna arrays and precoding techniques, signals for multiple users are combined and transmitted simultaneously over the same spectrum resources, achieving spectrum resource multiplexing and improving the quantity of information transmitted per unit spectrum.
Solution Approach 2:
By adding the spatial dimension to resource allocation, the patent enables multiple users to share the same spectrum resources through spatial multiplexing. This dimensional expansion allows the system to serve more users with the same spectrum resources, thereby improving spectrum resource multiplexing ability without requiring additional spectrum bandwidth.
3Productivity
If spatial angle information is used for user grouping and precoding, then spectrum efficiency is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary user grouping based on spatial angle information before actual data transmission. By pre-cluster.ing users into space division user groups and calculating precoding vectors in advance, the system reduces real-time processing complexity while maintaining high spectrum efficiency during actual communication.
Solution Approach 2:
The patent changes the parameter representation from full channel state information to simplified spatial angle information and statistical channel information. This parameter transformation reduces the dimensionality and complexity of the input data for user grouping and precoding calculations, making the system more tractable while preserving the essential spatial characteristics needed for spectrum efficiency.
Data Source
AI summary
The present invention discloses a large-scale MIMO satellite mobile communication method and system. A satellite or gateway station uses spatial angle information of user terminals to group the users to be served in the coverage area to form space division user groups, wherein the user terminals in the same group use the same time-frequency resources to communicate with the satellite, while the user terminals in different groups use different time-frequency resources to communicate with the satellite. For the user terminals in the same space division user group, the satellite or gateway station uses statistical channel information of each user terminal to calculate a downlink precoding vector and an uplink receiving processing vector corresponding to each user terminal, and then uses the obtained vectors to perform downlink precoding transmission and uplink received signal processing. The user terminal uses Doppler frequency shift resulted from the movement of the satellite and minimum propagation time delay of long-distance propagation to make compensation for the frequency and time of the signal received and sent by the user terminal. The present invention can greatly improve the spectrum efficiency and power efficiency of a satellite mobile communication system and reduce the implementation complexity of the satellite mobile communication system.