Satellite Transmission Power Control With Adaptive TPC Set Points
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Solution Overview
Problem
Conventional satellite communication systems set a fixed TPC set point without checking its appropriateness, leading to unnecessary limitation of transmission power in fine weather and inefficient transmitter use.
Innovation Solution
A satellite communication system with a transmission power controller that adjusts and updates the TPC set point based on accumulated data, extracting an appropriate value to enhance transmission power in fine weather.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TPC set point is set larger for rainfall attenuation compensation, then the transmission power during rainfall is improved, but the reference transmission power in fine weather is limited more than necessary
Solution Approach 1:
The TPC set point is changed from a fixed value to a dynamically adjustable parameter. The system accumulates TPC controlled variables over time, extracts an appropriate set point based on statistical analysis (excluding top predetermined proportion of extreme values), and updates the TPC set point accordingly. This dynamic adjustment allows the system to optimize the balance between rainfall compensation and fine weather power utilization.
Solution Approach 2:
The system implements a feedback mechanism by accumulating historical TPC controlled variables, analyzing their distribution, and using this information to update the TPC set point. The feedback loop continuously monitors transmission conditions and adjusts the set point to reflect actual operational needs, preventing both excessive and insufficient power settings.
2Object-affected harmful factors
If the TPC set point is set excessively large, then rainfall attenuation compensation is enhanced, but the transmitter efficiency in fine weather deteriorates
Solution Approach 1:
The system dynamically determines the TPC set point based on accumulated operational data rather than using a fixed excessive value. By analyzing the distribution of TPC controlled variables and excluding extreme values (top predetermined proportion), the system identifies an appropriate set point that balances rainfall compensation needs with fine weather efficiency requirements.
Solution Approach 2:
The TPC set point parameter is changed from a static fixed value to a variable determined through statistical analysis of accumulated data. The system modifies this parameter based on the extracted appropriate value, which reflects actual transmission conditions and optimizes both rainfall compensation and fine weather transmitter efficiency.
Data Source
AI summary
A transmission power controller includes: a control unit that outputs, within a range not exceeding a transmission power control (TPC) set point, a TPC controlled variable that increases transmission power of a transmission system device more in a case of a larger attenuation of a reception signal received from a communication satellite; a data accumulation unit that accumulates the TPC controlled variable; an appropriate value extraction unit that extracts, as a TPC appropriate set point, the largest TPC controlled variable among the accumulated TPC controlled variables except a top predetermined proportion; and an updating unit that outputs, to the transmission system device, a reference transmission power increase signal that increases the reference transmission power more in a case of a larger difference between the TPC set point and the TPC appropriate set point and updates the TPC set point with the TPC appropriate set point. Thereby, efficient use of a transmitter is enabled.