Transform-Domain Narrowband Interference Suppression in Receive Channels
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Solution Overview
Problem
Existing methods for suppressing narrowband interference in wireless communication systems, such as notch filtering, are costly and complex, and fail to effectively adapt to varying interference patterns in real-time, affecting communication quality and capacity.
Innovation Solution
A method and device that utilize digital signal processing to detect and suppress narrowband interference in the transform domain, using sampled digital signals to generate an interference suppression pulse function and perform adaptive filtering, reducing the need for multiple notch devices and simplifying implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If notch filtering method with multiple notch devices is used in RF signal path, then narrowband interference suppression is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the mechanical/analog notch filtering system with a digital signal processing system. Instead of using physical notch devices in the RF path, the invention uses digital signal processing to detect interference characteristics and generate corresponding suppression signals, thereby eliminating the need for complex analog filtering hardware while achieving the same interference suppression effect
Solution Approach 2:
The patent changes the operating parameters from fixed analog filter characteristics to dynamically adjustable digital processing parameters. By detecting interference frequency, bandwidth, and power characteristics, the system adapts the suppression pulse function parameters in real-time, allowing flexible interference suppression without requiring multiple fixed notch devices
2Object-affected harmful factors
If multiple notch devices are deployed in series, then interference suppression capability is improved, but implementation cost and complexity increase
Solution Approach 1:
The patent creates a universal interference suppression system that can handle multiple types of narrowband interference through a single digital processing platform. The system detects various interference characteristics (frequency, bandwidth, power) and generates appropriate suppression signals, making one device capable of performing the function of multiple specialized notch devices
Solution Approach 2:
The patent uses digital copying of interference characteristics to create suppression signals. By detecting and copying the frequency and power characteristics of interference, the system generates corresponding suppression pulse functions that replicate the interference profile, achieving suppression without physical multiple devices
3Reliability
If real-time interference detection is implemented, then communication quality is maintained, but system complexity increases
Solution Approach 1:
The patent implements a self-service interference suppression system where the digital signal processing unit automatically detects interference characteristics and generates suppression signals without external intervention. The system monitors its own received signals, identifies interference patterns, and applies appropriate suppression, reducing the need for complex external control mechanisms
Data Source
AI summary
The method obtains an interference detection result by detecting sampled digital signals in real time in a transform domain, then maps the interference detection result into an interference suppression pulse function on the basis of a unit noise pulse function, and carries out interference suppression filtering in the transform domain according to the interference suppression pulse function. The present invention is capable of detecting narrowband interference such as monotone, frequency modulation, and phase modulation interferences in a receive channel adaptively in real-time, and suppressing the interference adaptively according to the quantity, energy and bandwidth of the interference, so as to reduce the influence of the interference. Therefore, the present invention may enhance robustness of the communication system against interference. Moreover, the present invention does not need multiple notch devices, costs low and may be implemented simply and reliably.