Antenna-Plexer Feedback Path for Adjacent-Band Interference Cancellation
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Solution Overview
Problem
Radio frequency communication systems face coexistence challenges due to mutual desensitization effects between transceivers operating on adjacent frequency bands, leading to interference issues such as adjacent channel leakage, harmonic interference, and intermodulation distortion, which conventional techniques like high-Q bandpass filters are insufficient to address effectively.
Innovation Solution
The implementation of an antenna-plexer and feedback receiver system that generates a feedback signal to compensate for interference in RF communication systems, using a triplexer configuration to handle different frequency ranges and filter carrier frequencies, enabling digital self-interference cancellation and reducing linearity specifications of the feedback receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-Q bandpass filters are used to address interference, then selectivity is improved, but device complexity and cost increase
Solution Approach 1:
The antenna system is segmented into multiple antenna-plexers, each handling specific frequency ranges. The feedback receiver is segmented to process specific interference components. This segmentation allows targeted interference cancellation without requiring complex filtering across all frequencies, reducing overall system complexity while maintaining selectivity.
Solution Approach 2:
A feedback signal path is introduced as an intermediary mechanism. The antenna-plexer captures transmit signal leakage and feeds it back through a dedicated feedback receiver that processes only the interference component. This intermediary feedback path enables selective interference cancellation without requiring complex filtering in the main signal path.
2Object-affected harmful factors
If conventional filtering techniques are used to reduce interference, then adjacent channel leakage is reduced, but harmonic interference and intermodulation distortion remain unaddressed
Solution Approach 1:
The antenna-plexer is designed with multi-functionality to handle multiple types of interference simultaneously. By capturing the full transmit signal spectrum and feeding it back through the feedback receiver, the system can cancel adjacent channel leakage, harmonic interference, and intermodulation distortion through a single unified mechanism, rather than requiring separate filters for each interference type.
Solution Approach 2:
A feedback mechanism is implemented where the antenna-plexer captures transmit signal leakage and feeds it back to the feedback receiver. This feedback path enables the system to dynamically cancel multiple types of interference including adjacent channel leakage, harmonics, and intermodulation distortion by processing the actual transmitted signal characteristics, providing versatile interference cancellation capability.
3Object-affected harmful factors
If the feedback receiver processes the full transmit signal spectrum, then all interference types are canceled, but linearity specifications and dynamic range requirements increase
Solution Approach 1:
The feedback receiver is designed to process only the specific frequency range and interference components relevant to the receive band, rather than the entire transmit signal spectrum. The antenna-plexer is configured to extract and feed back only the interference components that affect the receive signal. This localized processing approach maintains effective interference cancellation while reducing the linearity and dynamic range requirements of the feedback receiver.
4Productivity
If multiple transceivers operate on adjacent frequency bands, then spectrum utilization is improved, but mutual desensitization effects increase
Solution Approach 1:
The antenna-plexer implements a feedback mechanism that captures transmit signal leakage from transceivers operating on adjacent frequency bands and feeds it back to the feedback receiver. This feedback path enables active cancellation of the transmitted signal's effect on co-channel receivers, allowing multiple transceivers to operate simultaneously on adjacent bands without mutual desensitization, thereby enabling efficient spectrum utilization.
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
This approach improves dynamic range and noise figure, effectively canceling aggressor signals close to the receiver's noise floor, reducing desensitization, and enabling coexistence between different wireless technologies like cellular and Wi-Fi networks.
Implementation Method 1
the feedback section is configured to filter a carrier frequency of the transmit signal
Implementation Method 2
a feedback receiver configured to process the feedback signal to provide compensation to the receive signal
Data Source
AI summary
Antenna-plexers for interference cancellation are provided herein. In certain embodiments, a wireless device includes an antenna, an antenna-plexer coupled to the antenna and configured to generate a feedback signal, a transmitter configured to transmit a transmit signal to the antenna by way of the antenna-plexer, a receiver configured to process a receive signal, and a feedback receiver configured to process the feedback signal from the antenna-plexer to provide compensation to the receive signal.