Amplifier Circuit for Multiband Radio Signal Interference Reduction
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Solution Overview
Problem
Existing methods for amplifying radio signals in vehicles face challenges with signal attenuation due to vehicle bodies acting as Faraday cages, and the increasing complexity of overlapping frequency bands leads to interference and difficulty in determining the active amplifier paths for optimal amplification, especially in adjacent or overlapping frequency bands.
Innovation Solution
A method and circuit arrangement that activates amplification in both the first frequency band using FDD and second frequency band using TDD methods, with detection mechanisms to determine signal assignment and activate corresponding amplifier paths, ensuring optimal operation by deactivating unnecessary paths to prevent interference, and using signal level and duration thresholds to unambiguously assign transmission signals to specific bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple amplifiers are activated for different frequency ranges, then the circuit arrangement can support multiple communication standards and frequency bands, but mutual interference occurs between activated amplifiers
Solution Approach 1:
The system dynamically switches between different amplifier configurations based on the active communication standard. For FDD mode, the first transmission amplifier path is activated; for TDD mode, the second transmission amplifier path is activated. This dynamic adaptation allows the circuit to support multiple frequency bands and standards while preventing mutual interference by ensuring only the appropriate amplifier is active at any given time.
2Use of energy by moving object
If amplifiers for unused frequency ranges are deactivated, then power consumption is reduced and interference is minimized, but the circuit cannot support multiple communication standards simultaneously
Solution Approach 1:
The control unit dynamically activates or deactivates specific amplifier paths based on the detected transmission signal and active communication standard. When FDD is active, the first amplifier path remains powered while the second is deactivated, and vice versa for TDD. This dynamic power management enables multiband support while minimizing power consumption by keeping only necessary amplifiers active.
3Reliability
If signal amplification is performed in overlapping frequency bands, then coverage is improved, but unambiguous signal assignment becomes difficult and interference increases
Solution Approach 1:
The control unit uses feedback from the detected transmission signal to determine the active communication standard and accordingly activate the appropriate amplifier path. By monitoring the transmission signal characteristics and comparing them against known FDD and TDD patterns, the system resolves signal assignment ambiguity in overlapping bands and selects the correct amplifier configuration, maintaining reliable coverage without interference.
Data Source
AI summary
Amplification of received signals in the first and second frequency bands is activated in the absence of a transmission signal in the circuit arrangement in both the first frequency band and the second frequency band. In response to a detection of a transmission signal in the circuit arrangement, the detected transmission signal is checked as to whether the detected transmission signal can be unambiguously assigned to the first frequency band or the second frequency band. If the check reveals that the detected transmission signal cannot be unambiguously assigned to the first frequency band or the second frequency band, a first transmission amplifier path for amplifying the transmission signal in the first frequency band and a first receiving amplifier path for amplifying received signals in the first frequency band are activated.