RF Filter Feedback for Wireless Self-Interference Suppression
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Solution Overview
Problem
Current interference suppression methods, such as high-order filters, fail to effectively address self-interference issues in wireless communication systems, leading to reduced output capability and inability to manage parasitic signals generated by nonlinear characteristics of electronic devices.
Innovation Solution
An interference suppression system comprising a control module, RF sending and receiving channels, antennas, and multiple filter modules with adjustable frequency bands, power detecting, and gain amplifiers, which utilize feedback mechanisms to reduce interference between coexisting communication systems like LTE and WIFI by adjusting filter settings based on detected power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high order filter is used to filter interference, then interference suppression capability is improved, but output capability deteriorates
Solution Approach 1:
The patent divides the interference suppression function into multiple independent filter modules, each targeting specific interference frequencies. Instead of using a single high-order filter that degrades output capability, the system segments the filtering task across multiple lower-order filters with different frequency characteristics, thereby maintaining output capability while achieving comprehensive interference suppression.
Solution Approach 2:
Each filter module is designed with specific local frequency characteristics tailored to suppress particular interference sources. The control module dynamically adjusts which filter modules are activated based on detected interference types, applying localized filtering solutions rather than a blanket high-order filter approach, thus preserving overall output capability while addressing specific interference problems.
2Object-affected harmful factors
If high order filter is used to filter interference, then interference suppression capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces a single complex high-order filter with multiple simpler lower-order filter modules. Each module handles a specific frequency range or interference type, reducing the complexity of individual filter designs while collectively achieving the interference suppression performance of a high-order filter system.
Solution Approach 2:
The control module dynamically selects and configures which filter modules are active based on real-time interference detection. This dynamic adaptation allows the system to use only the necessary filtering components for current interference conditions, reducing overall device complexity compared to always deploying a fixed high-order filter structure.
3Adaptability or versatility
If multiple communication systems are set in one electronic product, then utility is improved, but self-interference increases
Solution Approach 1:
The control module continuously monitors the output signals from multiple communication systems and detects interference patterns. Based on this feedback, it dynamically adjusts the activation and configuration of filter modules to suppress self-interference between coexisting systems, enabling multiple systems to operate simultaneously with reduced mutual interference.
Solution Approach 2:
The system changes filtering parameters dynamically based on the operational state of multiple communication systems. When certain systems are active and generating interference, the control module adjusts which filter modules are engaged and their respective frequency characteristics, allowing the system to adapt to different communication scenarios and minimize self-interference.
Data Source
AI summary
An interference suppression system comprises an antenna, a control module, a receiving and sending module, a radio frequency (RF) sending channel, a power amplifier (PA), a RF receiving channel, a first filter module, and a power detecting module. The control module adjusts the first filter module frequency band to achieve filter feedback to the PA input end. The interference suppression system applies multiple feedbacks to enhance suppression capability, and reduces interference from RF sending channel to RF receiving channel because of PCB signal leakage and mutual interference between this system and adjacent systems.