Transceiver Power Adaptation for Intermodulation Control
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Solution Overview
Problem
In vehicles that communicate using multiple mobile radio systems, intermodulation products cause interference due to the processing of signals with non-linear transfer functions, particularly in the decimeter wavelength frequency range, where frequency bands overlap, leading to unwanted noise in reception channels.
Innovation Solution
A transceiver system with a control module that adapts the transmission power of a first mobile radio system based on the activity of a second mobile radio system, reducing interference by dynamically adjusting power levels in response to expected intermodulation effects, especially when specific frequency bands are used that may cause interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve communication reliability in the first mobile radio system, then signal quality improves, but intermodulation interference increases due to non-linear processing of high-power signals
Solution Approach 1:
The patent implements dynamic transmission power adjustment by continuously monitoring the activity state of the second communications module and adapting the transmission power of the first communications module accordingly. The control module dynamically switches between different power levels based on real-time detection of the second module's transmission state, resolving the contradiction between maintaining high communication reliability and minimizing intermodulation interference.
Solution Approach 2:
The patent changes the transmission power parameter of the first communications module based on the activity state of the second communications module. When the second module is detected to be active, the transmission power of the first module is reduced to a lower level, thereby reducing intermodulation interference while maintaining adequate communication reliability through adaptive parameter adjustment.
2Object-generated harmful factors
If transmission power is reduced to minimize intermodulation interference, then interference levels decrease, but communication reliability deteriorates due to lower signal strength
Solution Approach 1:
The control module dynamically adjusts transmission power between high and low levels based on real-time monitoring of the second communications module's activity. This dynamic adjustment ensures that power is reduced only when necessary (when the second module is active) and maintained at higher levels when the second module is inactive, thus minimizing interference while preserving communication reliability.
Solution Approach 2:
The system periodically monitors the activity state of the second communications module and adjusts the transmission power of the first module in periodic intervals. This periodic action allows the system to maintain optimal power levels that balance interference reduction and communication reliability by adapting to changing operational conditions.
3Device complexity
If fixed transmission power is used to simplify system design, then device complexity is reduced, but interference control becomes ineffective due to inability to adapt to varying activity states
Solution Approach 1:
The patent implements a feedback mechanism where the control module continuously monitors the activity state of the second communications module and uses this feedback to adjust the transmission power of the first communications module. This feedback loop enables automatic interference control without requiring complex predictive models, resolving the contradiction between simplicity and effectiveness by using real-time monitoring and adaptive response.
Solution Approach 2:
The control module autonomously manages transmission power adjustment based on its own monitoring of the second communications module's activity state. The system serves itself by automatically detecting interference conditions and adjusting power levels without external intervention, thereby maintaining simple system design while achieving effective interference control through self-adaptive behavior.
Data Source
AI summary
An apparatus, a method, and a computer program for a transceiver system having a first communications module for communication in a first mobile radio system and a second communications module for communication in a second radio system. The apparatus has a control module to adapt a transmission power used in the first mobile radio system on the basis of an activity of the second communications module in the second mobile radio system.