Bidirectional Radio Amplifier Switching for TDD Signal Isolation
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Solution Overview
Problem
Existing methods for amplifying radio signals between a terminal device and an antenna in vehicles face challenges due to signal attenuation by the vehicle body, require multiband capability to support various communication standards, and struggle with interference and power consumption, especially in bidirectional time-division multiplex methods with identical transmission and reception frequency ranges.
Innovation Solution
A method and circuit arrangement that detect signal powers in both transmission and reception directions, activating the appropriate amplifier paths based on power comparisons to avoid interference and reduce power consumption, using directional couplers and bandpass filters to ensure accurate signal detection and amplification in various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple amplifiers are activated to support multiple frequency ranges, then multiband capability is improved, but mutual interference between amplifiers increases
Solution Approach 1:
The system dynamically activates or deactivates specific amplifier paths based on the currently used frequency range. The control unit monitors which frequency band is in use and selectively activates only the corresponding amplifier, preventing mutual interference while maintaining multiband capability when needed.
2Use of energy by moving object
If amplifiers of unused frequency ranges are deactivated, then power consumption is reduced, but the ability to quickly switch between bands is affected
Solution Approach 1:
The system prepares amplifier paths in advance by keeping them in a low-power standby state rather than fully deactivated. This preliminary preparation allows the amplifiers to be quickly activated when band switching is required, reducing the switching delay while still maintaining lower power consumption compared to keeping all amplifiers fully active.
3Measurement precision
If high filtering effect is used to suppress adjacent RX signal levels, then signal detection accuracy is improved, but filter technology complexity increases
Solution Approach 1:
The system extracts and separates the detection of TX and RX signals into different frequency ranges using directional couplers and bandpass filters. By coupling out portions of signals at different frequencies to different detectors, the system achieves accurate signal detection without requiring complex high-order filters, as each detector operates in a dedicated frequency range.
4Object-affected harmful factors
If the vehicle body blocks radio signals, then radiation away from vehicle interior is improved, but signal attenuation increases
Solution Approach 1:
The system introduces an external antenna coupled via cable as an intermediary between the mobile radio device and the radio environment. This external antenna is positioned outside the vehicle body's Faraday cage effect, allowing reliable signal transmission while the vehicle body continues to provide radiation protection for the interior.
Data Source
AI summary
A circuit arrangement for amplifying radio signals between a terminal device and an antenna and to a corresponding circuit arrangement is disclosed. The circuit arrangement has a transmission amplifier path and a reception amplifier path. A signal power in a first frequency range in the transmitting direction is detected to determine a transmitted signal power and a signal power in a second frequency range in the receiving direction is detected to determine a received signal power. The detected transmitted signal power can be compared with the detected received signal power. If the detected transmitted signal power is stronger than the detected received signal power, the transmission amplifier path can amplify transmitted signals in the first frequency range. If the detected received signal power is stronger than the detected transmitted signal power, the reception amplifier path can amplify received signals in the second frequency range.