Precoding Unit Predicting Satellite Channel State via Terminal Location
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Solution Overview
Problem
Current satellite communication systems face high processing costs and resource usage at user terminals for calculating channel information, and simple terminals often have low-quality channel information due to high data processing requirements at both terminals and transmitter/gateway sides.
Innovation Solution
A precoding unit that receives location-related information from terminals to predict channel state information, allowing for efficient precoding without the need for terminals to determine and send back channel state information, thereby reducing processing and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals continuously calculate and send back channel state information to the transmitter, then precoding optimization can be achieved, but processing cost at the terminal and resource usage increase significantly
Solution Approach 1:
Instead of having terminals calculate and send channel state information back to the transmitter (traditional approach), the patent inverts the process by having the transmitter predict channel state information based on terminal location data. This reversal eliminates the need for complex terminal processing while maintaining precoding capabilities.
Solution Approach 2:
The patent introduces location information as an intermediary element that substitutes for direct channel state information transmission. Terminal location data serves as a mediator that the transmitter uses to predict channel conditions, thereby avoiding the need for terminals to perform complex channel calculations and feedback.
2Device complexity
If simple terminals are implemented with lower processing capabilities, then device complexity is reduced, but the quality of determined channel information deteriorates
Solution Approach 1:
The transmitter serves itself by predicting channel state information based on terminal location data rather than relying on terminals to provide accurate channel measurements. This self-service approach allows simple terminals to function effectively without compromising system performance.
Solution Approach 2:
The transmitter performs preliminary channel state prediction using location information before actual communication occurs. This preliminary action based on location data compensates for the lack of terminal processing capability and ensures adequate channel information quality is available for precoding.
3Reliability
If all users send back channel information continuously, then optimal precoding can be maintained, but resource consumption for transmission increases
Solution Approach 1:
The patent extracts the essential element needed for precoding (channel state information) and replaces it with a more efficient alternative (location-based prediction). By taking out the requirement for continuous channel information feedback, resource consumption is dramatically reduced while maintaining precoding functionality.
4Measurement precision
If high amount of data processing is performed at the transmitter/gateway side, then channel information accuracy is improved, but processing cost and complexity increase
Solution Approach 1:
The patent changes the input parameter from complex channel state measurements to simple location coordinates. This parameter change allows the transmitter to perform prediction based on location data rather than processing extensive channel information, thereby maintaining accuracy while reducing processing complexity.
Data Source
AI summary
A gateway is configured to communicate with a satellite so as to control the preceding/pre-equalization of a communication between the satellite and at least one terminal based on a channel state of a channel between the terminal and the satellite. The gateway is configured for receiving a location-related information indicating a location of the terminal and for determining a predicted channel state information related to the channel state between the terminal and the satellite using the location-related information. The gateway is configured for controlling the signal processing so as to precode the communication according to the predicted channel state information.