Radio Module Transmission Noise Suppression via Signal Cancellation
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Solution Overview
Problem
Communications apparatuses face interference issues due to high-order inter-modulation terms and wideband noise when multiple radio access technologies with overlapping frequency bands are integrated, leading to mutual interference between radio modules.
Innovation Solution
A communications apparatus with a transmission noise suppression device that processes downlink signals by calculating filter parameters to cancel transmission noise generated by uplink signals from another radio module, using either a reference-based or non-reference based approach, thereby eliminating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio access technologies with overlapping frequency bands are integrated into one communications apparatus, then the versatility and functionality of the device is improved, but mutual interference occurs between radio modules due to transmission noise leaking from one module to another
Solution Approach 1:
The patent extracts and removes the harmful transmission noise from the received downlink signal by using a transmission noise suppression device that identifies and eliminates the noise component generated by the other radio module, thereby resolving the interference issue while maintaining multi-RAT integration
Solution Approach 2:
The transmission noise suppression device acts as an intermediary between the two radio modules, processing the downlink signal to cancel out the noise introduced by the other module's uplink transmission, enabling coexistence without direct interference
2Volume of moving object
If radio modules are disposed close to each other to reduce device size, then the compactness of the communications apparatus is improved, but transmission noise leakage between modules increases
Solution Approach 1:
The patent converts the harmful transmission noise leakage into a measurable signal that can be suppressed. By using the leaked noise as a reference to calculate filter parameters, the system identifies and removes the interference, turning the proximity-induced problem into a solvable signal processing task
3Reliability
If transmission noise suppression processing is applied to downlink signals, then the signal quality and reliability are improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The transmission noise suppression device performs multiple functions: it filters the downlink signal, calculates filter parameters using reference signals, and suppresses noise across different frequency bands. This multi-functional approach achieves reliable noise suppression without requiring separate dedicated systems for each function
Data Source
AI summary
A method suppresses transmission noise comprised in a plurality of downlink signals received by one of a first radio module or a second radio module comprised in a communications apparatus. The method receives a plurality of first signals and a plurality of second signals, wherein the first signals and the second signals are the downlink signals respectively received via different antennas of the one of the first radio module or the second radio module, or the first signals are the downlink signals received by the one of the first radio module or the second radio module and the second signals are a portion of the uplink signals provided by the other one of the first radio module and the second radio module, and processes the plurality of first signals and the plurality of second signals to cancel transmission noise comprised in the plurality of downlink signals.