Adaptive Notch Filter Delay Control for Sweeping Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication receivers face challenges in effectively eliminating sweeping interference, which is characterized by varying frequencies and high dynamic, often leading to incomplete removal of interference due to delayed tracking and reset issues in adaptive notch filters.
Innovation Solution
An adaptive filter device comprising a detector circuit, delay circuit, tracker circuit, and notch filter circuit, where the detector circuit detects sweeping interference and provides a trigger signal to the delay circuit, which then triggers the tracker circuit after an adjustable delay, allowing the tracker to estimate and track the interference frequency for the notch filter to substantially eliminate it from the input signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the tracking circuit is immediately activated upon detection of sweeping interference, then the response time is improved, but the tracking precision deteriorates due to insufficient initialization
Solution Approach 1:
The delay circuit provides a predetermined period of time between detection and activation of the tracking circuit, allowing the system to prepare and initialize the tracking circuit before it becomes operational. This preliminary action ensures that when the tracking circuit is activated, it is properly initialized and can immediately achieve precise tracking without the trade-off of sacrificing precision for speed.
2Adaptability or versatility
If the tracking circuit is regularly reset to handle frequency jumps, then the adaptability is improved, but the loss of time increases due to repeated reset operations
Solution Approach 1:
The delay circuit is configured to detect frequency jumps and trigger the tracking circuit to reset before the interference frequency actually changes. By anticipating the frequency jump through detection and providing a predetermined delay period, the tracking circuit is reinitialized in advance, allowing it to smoothly track the frequency transition without requiring repeated reset operations, thus reducing time loss while maintaining adaptability.
3Reliability
If the notch filter is continuously adjusted to track sweeping interference, then the elimination effectiveness is improved, but the device complexity increases
Solution Approach 1:
The delay circuit acts as an intermediary component between the detector circuit and the tracking circuit. It provides a predetermined time delay and coordination function, managing the timing and activation of the tracking circuit without requiring complex control logic. This intermediary approach simplifies the overall system architecture while maintaining effective interference elimination through proper sequencing of circuit operations.
Data Source
AI summary
In one embodiment an adaptive filter structure comprises a detector circuit (10) configured to receive an input signal (Sin), to detect a presence of a sweeping interference in the input signal, and upon detection of such sweeping interference to provide a first trigger signal (T1) to a delay circuit (20), wherein the first trigger signal (T1) comprises a first frequency indication (f1); the delay circuit (20) is configured, upon receiving the first trigger signal (T1), to provide a second trigger signal (T2) to a tracker circuit (30) after an adjustable amount of time; the tracker circuit (30) is configured, upon receiving the second trigger signal (T2), to estimate a frequency of the sweeping interference using a second frequency indication (f2), to track the estimated frequency and provide the estimated frequency as a third frequency indication (13) to a notch filter circuit (40); and the notch filter circuit (40) is configured to substantially eliminate the sweeping interference from the input signal (Sin) using the third frequency indication (f3) and therefrom provide an output signal (Sout).