Multi-Signal Estimator for Matched Waveform Interference
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Solution Overview
Problem
Conventional signal cancellation/separation techniques require substantial information about the signals and are limited to specific channel environments, making them unsuitable for general use in multi-signal communication systems, especially in scenarios with matched waveform interference.
Innovation Solution
The implementation of a feedback-optimized multi-signal multi-stage estimator with data-aided signal parameter estimation, which requires minimal information about the received signals and can operate in both multi-path and line-of-sight channel environments, effectively separating desired signals from interfering signals by using eigenvalue analysis for initial phase estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional signal cancellation/separation techniques are used, then signal separation can be achieved in specific scenarios, but the techniques require substantial information about the signals and are limited to specific channel environments
Solution Approach 1:
The patent segments the composite signal into multiple individual signals through iterative estimation and cancellation stages. The multi-stage estimator divides the complex signal separation problem into sequential steps, where each stage estimates and removes one signal at a time, reducing the overall complexity of handling all signals simultaneously.
Solution Approach 2:
The patent performs preliminary eigenvalue analysis on the composite signal constellation to generate initial phase estimates before the main signal separation process. This preliminary action provides starting values that facilitate the subsequent iterative estimation and cancellation steps, enabling the system to work with minimal initial information.
2Device complexity
If data-aided signal parameter estimation is used, then signal separation requires minimal information about received signals, but multiple signal parameters must be estimated simultaneously
Solution Approach 1:
The patent employs feedback-optimized multi-signal multi-stage estimation where the output of each estimation stage feeds into the next stage. The system continuously refines signal parameter estimates by using the estimated signals to cancel interference from the composite signal, then re-estimating the remaining signals with improved accuracy. This iterative feedback process automates the parameter estimation while requiring minimal initial information.
Solution Approach 2:
The patent uses dynamic, adaptive estimation processes that adjust to the actual signal conditions in real-time. The multi-stage estimator dynamically updates signal parameters (amplitude, phase, frequency) based on the current composite signal composition, allowing the system to adapt to changing channel conditions and signal characteristics without requiring predetermined information.
3Adaptability or versatility
If multi-stage estimation with feedback optimization is implemented, then signal separation works in both multi-path and line-of-sight environments, but the processing complexity increases
Solution Approach 1:
The patent develops a universal signal separation architecture that functions across multiple channel environments (multi-path, line-of-sight, jamming conditions) using the same fundamental approach. The multi-stage estimator with eigenvalue analysis and feedback optimization provides a unified solution that adapts to different environmental conditions without requiring separate specialized techniques for each scenario.
Data Source
AI summary
Methods and systems of signal cancellation/separation for use in multi-signal communication environments are provided herein. Embodiments of the present invention use a feedback-optimized multi-signal multi-stage estimator with data-aided signal parameter estimation. Embodiments of the present invention require minimal information about the received signals and can be used to separate a desired signal from an interfering signal or two desired signals received on the same frequency. In the latter case, embodiments of the present invention effectively double the capacity of the communication system. Embodiments of the present invention are suitable for environments with intentional and/or unintentional jamming or interference. System embodiments of the present invention can be used as in-line solutions that can be inserted at different points in a receive chain.