Communication Interference Extraction Using Delay-Aligned Reference Signals
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Solution Overview
Problem
Wireless communication systems face challenges in accurately identifying and quantifying interference, particularly in satellite communications, due to the over-the-air transmission nature which can be susceptible to incidental or unauthorized interference.
Innovation Solution
A method that converts a digital baseband signal into an analog signal, transmits, receives, and processes it to estimate a delay and transmission gain, allowing for the generation of a scaled reference signal to subtract from the received signal and extract interfering components with high fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference extraction methods are implemented in the digital domain only, then processing complexity is reduced, but measurement precision of interference characteristics deteriorates
Solution Approach 1:
The signal processing is segmented into distinct stages: digital domain processing for reference signal generation and correlation, analog domain processing for interference extraction and characterization. This segmentation allows each domain to perform its optimal function, with digital processing providing precise reference signals and analog processing enabling accurate interference measurement through physical signal manipulation.
Solution Approach 2:
Analog signal processing serves as an intermediary between the digital reference signal and the final interference characterization. The analog domain acts as a mediator that translates digital reference signals into physical waveforms, enables precise interference measurement through correlation in the analog domain, and converts the results back to digital for further processing. This intermediary analog processing stage resolves the contradiction by providing high-precision interference measurement capabilities while maintaining manageable system complexity through structured signal flow.
2Measurement precision
If reference signal replication precision is increased, then interference extraction accuracy is improved, but computational resources required increase
Solution Approach 1:
The system creates a copy of the reference signal in the analog domain through precise replication of the transmitted signal characteristics. This analog copy is then correlated with the received signal to extract interference information. The copying process in the analog domain is more energy-efficient than digital processing because it leverages physical signal properties rather than requiring complex computational operations, thus achieving high replication precision with reduced computational energy consumption.
Solution Approach 2:
The patent replaces certain digital computational operations with analog signal processing mechanisms. Instead of performing complex correlation computations in the digital domain, the system uses analog signal correlation techniques that physically process the signals through linear operations. This substitution of digital computation with analog signal processing reduces the computational energy required while maintaining or improving the precision of reference signal replication and interference extraction.
Data Source
AI summary
A method for the extraction of communication interference, may include converting a digital baseband signal into an analog signal, transmitting the analog signal; receiving the analog signal, converting the analog signal after receipt into a received digital signal, modulating the digital baseband signal to generate a reference signal, estimating a delay between the received digital signal and the reference signal, generating an aligned reference signal based on the reference signal and the delay, estimating a transmission gain of the received digital signal based on the received digital signal and the aligned reference signal, multiplying the aligned reference signal by the transmission gain to generate a scaled reference signal, and subtracting the scaled reference signal from the received digital signal to generate an estimated interference present in the received digital signal.