Receiver Non-Linear Compensation for Satellite Signal Distortion
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Solution Overview
Problem
Current satellite communication systems face challenges in reducing self-distortion and intermodulation due to non-linear amplification, which complicates signal reception and reduces communication reliability, especially when multiple carriers are transmitted over the same channel.
Innovation Solution
A low-complexity compensation method and circuit that applies a non-linear transformation to selected transponder signals using adjustable spectral filters and receive filters, represented by parameter values determined by performance metrics, to mitigate self-distortion and intermodulation at the receiver side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If amplifiers are operated close to saturation points to optimally exploit power resources, then power efficiency is improved, but self-distortion and intermodulation increase
Solution Approach 1:
The patent applies non-linear transformation at the receiver to convert the harmful non-linear distortion effects (self-distortion and intermodulation) into beneficial compensation. By estimating the distortion characteristics and applying inverse non-linear transformation, the system converts the harmful amplifier saturation effects into corrected signal output, thereby maintaining power efficiency while reducing distortion.
Solution Approach 2:
The patent changes the signal parameters through non-linear transformation functions that adjust amplitude and phase relationships. By applying parameter transformation based on estimated distortion characteristics, the system modifies the signal to compensate for non-linear channel effects, resolving the contradiction between power efficiency and distortion.
2Productivity
If multiple modulated carriers are placed close to each other in frequency domain to optimally exploit bandwidth resources, then bandwidth efficiency is improved, but intermodulation interference increases
Solution Approach 1:
The patent converts the harmful intermodulation interference between closely spaced carriers into beneficial information by estimating the interference characteristics and applying non-linear transformation. The system uses the distorted signal characteristics to compute compensation parameters, thereby converting the harmful intermodulation effects into corrected carrier signals while maintaining high bandwidth efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where the receiver estimates distortion characteristics from received signals and uses this information to adjust non-linear transformation parameters. This feedback loop enables continuous compensation of intermodulation interference between carriers, allowing dense frequency packing while maintaining signal integrity.
3Reliability
If non-linear transformation is applied to compensate distortion, then signal quality is improved, but receiver complexity increases
Solution Approach 1:
The patent applies preliminary estimation of distortion characteristics using simplified models before implementing the full non-linear transformation. By pre-characterizing the channel distortion properties and using these estimates to guide the compensation process, the system reduces the computational complexity required for real-time distortion correction while maintaining signal quality improvement.
Solution Approach 2:
The patent uses parameter-based non-linear transformation models that can be efficiently implemented. By representing distortion through a set of parameters that can be estimated and then applied through standardized transformation functions, the system achieves effective compensation with controlled receiver complexity, avoiding the need for overly complex signal processing.
Data Source
AI summary
A receiver device for a communication system is arranged for receiving a signal comprising a plurality of transponder signals each containing a plurality of carrier signals and comprises: an adjustable spectral filter configurable for selecting a desired transponder signal. Means for performing a non-linear transformation on the selected desired transponder signal, whereby the non-linear transformation is represented by a set of parameter values. At least one receive filter configurable to select at least one desired carrier signal of the non-linearly transformed selected desired transponder signal and, performance measuring means for determining one or more performance metrics on at least one carrier signal of the plurality of carrier signals contained in the desired transponder signal to obtain the set of parameter values.