Non-linear Interference Detection in Wireless Systems
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Solution Overview
Problem
Non-linear interference in wireless communication systems, caused by offending signals experiencing non-linear behavior, degrades the quality of received signals by overlapping with assigned frequency channels, leading to reduced receiver performance.
Innovation Solution
A method and detector for non-linear interference detection in wireless communication systems, which involves determining the magnitude of victim and offending signals raised to specific powers, correlating these signals to assess interference, and scaling them to produce an output indicative of interference extent, without requiring synthesis of non-linear interference terms or frequency shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If traditional intermodulation detection methods are used, then interference detection capability is provided, but device complexity increases due to synthesis of intermodulation products and frequency shifting operations
Solution Approach 1:
The patent extracts only the essential correlation operation from the complex detection process. Instead of synthesizing all possible intermodulation products and performing frequency shifting, the invention directly correlates the received signal with the transmitted signal to detect non-linear interference, thereby simplifying the detection system while maintaining effectiveness.
Solution Approach 2:
The patent inverts the traditional detection approach by directly correlating the received signal with the transmitted signal rather than synthesizing interference products. This inversion simplifies the detection process and reduces computational complexity while effectively identifying non-linear interference.
2Measurement precision
If multiple carriers at multiple frequencies are processed, then comprehensive interference detection is achieved, but processing time increases due to the large number of non-linear product combinations
Solution Approach 1:
The patent extracts only the necessary correlation operation between the received and transmitted signals, eliminating the need to process all possible non-linear product combinations. This selective approach maintains detection accuracy while significantly reducing processing time.
Solution Approach 2:
Instead of processing all possible non-linear combinations (excessive action), the patent applies a partial action by directly correlating the signals, which is sufficient to detect non-linear interference without the computational burden of exhaustive processing.
3Measurement precision
If signal time-alignment and frequency shifting are performed, then accurate correlation is achieved, but operational complexity increases
Solution Approach 1:
The patent extracts the core correlation operation while eliminating the complex pre-processing steps of time-alignment and frequency shifting. By directly correlating the received signal with the transmitted signal, the invention achieves sufficient correlation accuracy without the operational complexity of signal alignment procedures.
Data Source
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AI summary
A method, detector and radio unit for non-linear interference detection in a communication system having a victim signal and an offending signal are disclosed. According to one aspect, a method includes determining a magnitude of the victim signal raised to a first power to produce a first signal. The method also includes determining a magnitude of the offending signal raised to a second power to produce a second signal. The first signal and the second signal are correlated to produce an output signal indicative of an extent to which the offending signal interferes with the victim signal.