Amplifier NPR Characterization for Efficient Satellite Uplinks
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Solution Overview
Problem
Current satellite broadcast systems face limitations in power and spectral efficiency due to fixed uplink signal power and frequency allocations, making it difficult to transmit additional signals within the allocated bandwidth.
Innovation Solution
A system and method for characterizing amplifiers using a Gaussian signal source, notch filter, Inverse Fast Fourier Transform, normalization, and measurement device to calculate the Noise-Power Ratio (NPR), which assesses the amplifier's nonlinearity and efficiency in a multi-carrier environment, optimizing power output and noise performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed uplink signal power and frequency allocations are used, then system stability is maintained, but power and spectral efficiency are limited
Solution Approach 1:
The patent implements dynamic frequency assignment where satellite channels are allocated based on real-time traffic demand and signal strength requirements. The system continuously monitors uplink signal characteristics and adjusts frequency assignments and power allocation dynamically, transforming the static fixed allocation into a dynamic adaptive system that optimizes power efficiency while maintaining stability through controlled adjustment mechanisms
Solution Approach 2:
The system changes operating parameters including frequency assignments, power levels, and channel allocations based on measured uplink signal conditions. By adjusting these parameters dynamically according to actual traffic and signal quality, the system achieves improved power and spectral efficiency while maintaining reliable operation through parameter optimization
2Productivity
If additional satellites and channels are added, then signal transmission capacity increases, but power and bandwidth constraints are exceeded
Solution Approach 1:
The patent enables existing satellite channels and frequency allocations to serve multiple functions and multiple satellites simultaneously through dynamic assignment. A single frequency resource can be allocated to different satellites and channels based on demand, allowing the system to support additional satellites and channels within existing power and bandwidth constraints by making resources multi-functional and shareable
Solution Approach 2:
The system optimizes power and bandwidth utilization by dynamically adjusting transmission parameters including power levels, frequency assignments, and channel allocations. This allows additional satellites and channels to be accommodated within existing constraints through efficient parameter optimization rather than requiring additional resources
3Device complexity
If amplifier nonlinearity is not characterized, then system complexity is reduced, but signal transmission accuracy deteriorates
Solution Approach 1:
The patent implements preliminary characterization of amplifier nonlinearity through NPR measurements before actual signal transmission. By pre-measuring and storing amplifier characteristics including nonlinear distortion behavior, the system prepares compensation data in advance that can be applied during operation to maintain signal accuracy without adding complex real-time processing
Solution Approach 2:
The system uses NPR measurement feedback to characterize amplifier nonlinearity and apply compensation. By measuring the amplifier's actual nonlinear behavior and using this feedback information to adjust signal processing, the system maintains high transmission accuracy while managing complexity through measured-based compensation rather than complex theoretical models
Data Source
AI summary
Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.