Terminal Transmit Power Control for Satellite Return Links
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Solution Overview
Problem
Current satellite communication systems face challenges in dynamically optimizing terminal transmit power to maximize efficiency while avoiding non-linear distortion, which requires costly manual calibration and is not adaptable to instantaneous modulation and coding changes, leading to inefficiencies and interference.
Innovation Solution
A method to dynamically adjust the transmit power of terminal transmitters by checking the ratio of non-linear distortion power to noise power and updating the power accordingly, ensuring the non-linear distortion power remains below a certain threshold to avoid interference with adjacent channels, using metrics like carrier-to-distortion power ratio and carrier-to-noise power ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal transmit power is increased to maximize signal-to-noise ratio, then communication efficiency is improved, but non-linear distortion from power amplifier increases causing interference with adjacent channels
Solution Approach 1:
The patent implements dynamic transmit power adjustment where the terminal continuously monitors the carrier-to-distortion ratio and carrier-to-noise ratio, and automatically adjusts its transmit power level in real-time. This dynamic adaptation allows the system to operate at optimal power levels that maximize communication efficiency while keeping distortion within acceptable limits, resolving the contradiction between productivity and harmful factors.
Solution Approach 2:
The patent employs a feedback mechanism where the terminal measures the actual distortion and noise levels in the transmitted signal and uses this information to adjust its transmit power. By continuously monitoring the carrier-to-distortion ratio and carrier-to-noise ratio, the system can maintain optimal operation without causing interference to adjacent channels, thus resolving the contradiction between communication efficiency and non-linear distortion.
2Productivity
If manual calibration is used to optimize transmit power, then power optimization is achieved, but cost and complexity increase
Solution Approach 1:
The patent enables the terminal to perform its own power optimization through self-measurement and self-adjustment. The terminal independently monitors its transmit power, distortion, and noise levels, and automatically adjusts its power levels without requiring external calibration equipment or manual intervention. This self-service approach eliminates the need for costly manual calibration while achieving optimal power settings, resolving the contradiction between power optimization and device complexity.
3Device complexity
If fixed transmit power is used, then device complexity is reduced, but adaptability to modulation and coding changes is lost
Solution Approach 1:
The patent transitions from fixed to dynamic transmit power control, where the terminal automatically adjusts its power levels in response to changing modulation and coding conditions. This dynamic adaptation allows the system to maintain optimal performance across different operating conditions without requiring complex manual reconfiguration, resolving the contradiction between device complexity and adaptability.
Data Source
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AI summary
The present invention relates to a method for adjusting transmit power of a terminal transmitter on a return link between the terminal transmitter and a receiver. The terminal transmitter is one of a plurality of terminal transmitters, wherein each terminal transmitter can send one or more data burst signals. The receiver receives a receive signal being an aggregate of versions of the data burst signals sent from the plurality of terminal transmitters. The method comprises: a) checking on a version of at least one data burst signal comprised in the receive signal, said at least one data burst signal sent from a first terminal transmitter of said plurality, whether a condition is met that the amount of non-linear distortion power with which the version of the at least one data burst signal is impaired, said non-linear distortion resulting from a power amplifier in the first terminal transmitter, is a given number of dB below the amount of noise power with which the version of the at least one data burst signal is impaired, and b) determining an updated transmit power value for a next data burst signal to be sent from the first terminal transmitter, depending on the outcome of said checking.