Notch Filter for Dual-Connectivity Cross-Modulation Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In dual connectivity architectures, cross-modulation interference occurs between 4G and 5G signal transceiving devices due to direct or indirect interactions between signals of different frequency bands, leading to potential blockage of 4G signal reception.
Innovation Solution
A notch filter, implemented as an open-loop wire with a preset length connected in parallel to the downlink, filters out a part of the 5G uplink signal within a specific frequency band to prevent cross-modulation interference, specifically targeting the third-order harmonic of the 4G uplink signal to reduce noise and improve receiver sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 4G and 5G signal transceiving devices work at the same time, then dual connectivity is achieved, but cross-modulation interference occurs between different frequency bands
Solution Approach 1:
The patent extracts and removes the harmful second uplink signal from the first downlink using a notch filter. The filter is specifically designed to extract and eliminate the frequency band where cross-modulation interference occurs, allowing the 4G downlink receiver to operate without interference from 5G uplink signals while maintaining dual connectivity functionality.
Solution Approach 2:
The notch filter acts as an intermediary component between the first downlink signal path and the second uplink signal path. It mediates the interaction by selectively attenuating the interfering frequency components without blocking the entire downlink path, thus enabling coexistence of 4G and 5G systems.
2Object-affected harmful factors
If a notch filter is added to filter out interfering signals, then cross-modulation interference is reduced, but device complexity increases
Solution Approach 1:
Instead of applying a broad filtering approach across the entire frequency spectrum, the patent applies local quality by designing a notch filter that targets only the specific frequency band where cross-modulation interference occurs. This localized filtering approach minimizes the impact on the overall system while effectively eliminating the harmful interference.
Solution Approach 2:
The patent employs a relatively simple and cost-effective notch filter design rather than complex filtering systems. The filter is designed to be a minimal addition to the existing transceiving system, using straightforward circuitry that can be integrated without significantly increasing overall device complexity or cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The notch filter effectively attenuates the 5G uplink signal, significantly reducing noise received by the 4G signal receiver and enhancing its sensitivity by eliminating cross-modulation interference.
Implementation Method 1
utilizing a notch filter arranged on the first downlink to filter out a part of the second uplink signal within a preset frequency band
Implementation Method 2
An open-loop wire with a preset length connected in parallel to the first downlink serves as a notch filter, and the part of the second uplink signal within the preset frequency band is filtered out by using the open-loop wire with the preset length
Data Source
AI summary
A method and device for downlink signal transmission in a dual-connection architecture, and a terminal. The method comprises: when a first signal receiver and a second signal transmitter both operate, after a second uplink signal and a higher harmonic signal of a first uplink signal enter a first downlink and before entering the first signal receiver, using a notch filter arranged on the first downlink to filter out a signal located in a preset frequency band in the second uplink signal.