Receiver Interference Band Removal for Narrowband Signal Rejection
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Solution Overview
Problem
Narrowband interference signals, such as Bluetooth signals and GSM harmonics, degrade the performance of receivers by increasing error rates and reducing throughput in wireless networks, as they fall within the receive bandwidth of interest and are difficult to distinguish from the signal of interest.
Innovation Solution
A receiver generates a residue signal by subtracting the signal of interest from the input signal and identifies interference bands, then removes frequency components corresponding to these bands to eliminate narrowband interference, using techniques like channel estimation and autocorrelation to detect and remove interference from both preamble and payload portions of packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrowband interference signals are present in the receiver band, then the receiver can detect and process signals within its bandwidth, but the interference signals degrade decoding accuracy and reduce network throughput
Solution Approach 1:
The patent segments the received signal into signal of interest and interference components by performing spectral analysis to identify narrowband interference frequency bands, then separately processing these components through selective filtering to improve decoding accuracy
Solution Approach 2:
The patent extracts narrowband interference signals from the received signal by identifying their frequency bands through spectral analysis, then removes these extracted interference components to eliminate their degrading effect on decoding accuracy
2Productivity
If the receiver processes all frequency components within its bandwidth, then it can capture the complete signal band of interest, but it also processes interfering signals that reduce overall network throughput
Solution Approach 1:
The patent segments the frequency spectrum into signal bands and interference bands through spectral analysis, then processes only the signal bands while filtering out interference bands, thereby improving network throughput by eliminating interference contributions
Solution Approach 2:
The patent extracts and removes narrowband interference frequency components from the received signal before further processing, allowing the receiver to process only the clean signal portions and从而提高 overall network throughput
3Object-affected harmful factors
If the receiver uses traditional filtering methods to remove narrowband interference, then it can reduce interference impact, but it may also attenuate parts of the signal of interest and reduce measurement precision
Solution Approach 1:
The patent performs preliminary spectral analysis to accurately identify the frequency bands of narrowband interference before applying filtering, ensuring that the filtering operation targets only the interference components and preserves the signal of interest, thereby maintaining measurement precision
Solution Approach 2:
The patent changes the filtering approach from fixed bandwidth filtering to adaptive frequency-selective filtering based on spectral analysis results, adjusting the filter parameters dynamically to match the actual interference frequency bands and minimize signal attenuation
Data Source
AI summary
A wireless device receives an input signal representing a signal of interest (e.g., one or more portions of a packet) on a wireless medium. The input signal may, in addition, contain narrowband interference signals. The wireless device removes the signal of interest from the input signal to produce a residue signal, and analyzes the residue signal to determine the presence of any interference bands in which narrowband interference signals may be present. The wireless device then removes the detected interference bands from the input signal. The residue signal may reveal the presence of interference signals, which might otherwise be hard to distinguish in the input signal. Thus, interference signals with power levels much lower than the power of the signal of interest may be detected and removed.