Duplex Gap Leakage Cancellation for IMD-Limited Receiver Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication devices suffer from self-interference due to duplex gap leakage (DGL) components causing intermodulation distortion (IMD), which reduces reception signal sensitivity, particularly in narrow duplex spacing and intra-band non-contiguous carrier aggregation scenarios.
Innovation Solution
An electronic device and method for self-interference cancellation that includes a kernel generation module to extract DGL components, model IMD components, and a cancellation circuit to digitally filter and remove these components from the reception signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital filtering and cancellation operations are applied to remove IMD components, then reception signal sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary extraction of the DGL component from the reception signal before modeling the IMD component. By pre-processing the reception signal to isolate the DGL component, the system prepares the necessary input data for accurate IMD modeling and cancellation, thereby improving reception sensitivity while managing computational complexity through structured preprocessing
Solution Approach 2:
The patent introduces an intermediary modeling process that uses the extracted DGL component and transmission signal to generate a modeled IMD component. This modeled IMD component serves as an intermediary representation that can be digitally filtered and canceled from the original reception signal, enabling sensitivity improvement through a systematic multi-stage processing approach
2Measurement precision
If the DGL component is extracted and used to model IMD components, then self-interference cancellation accuracy is improved, but processing time increases
Solution Approach 1:
The system performs preliminary extraction of the DGL component from the reception signal before proceeding to IMD modeling. This pre-extraction step prepares the necessary input data in advance, enabling more efficient subsequent processing stages and reducing overall processing time while maintaining cancellation accuracy
Solution Approach 2:
The patent segments the self-interference cancellation process into distinct stages: DGL component extraction, IMD component modeling using extracted DGL and transmission signal, digital filtering of the modeled IMD, and final cancellation from the reception signal. This segmentation allows each stage to be optimized independently, balancing accuracy requirements with processing time constraints
Data Source
AI summary
An electronic device includes a filter circuit extracting a duplex gap leakage (DGL) component present between a transmission channel for a transmission signal and a reception channel for a reception signal, from the reception signal, modeling an actual intermodulation distortion (IMD) component of the reception signal based on the transmission signal and the DGL component to generate an estimated IMD component, and a cancellation circuit performing a digital filtering operation on the estimated IMD component to generate a filtered IMD component and cancelling the filtered IMD component from the reception signal.