Self-Synchronizing TDD Antenna System for Cable Loss Compensation
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Solution Overview
Problem
Existing communication systems face challenges in efficiently transmitting and receiving signals in time-division duplex (TDD) mode, particularly when installed in locations that obstruct wireless connections due to physical barriers or extreme range, and require active communication with user systems to adjust signal power.
Innovation Solution
A self-synchronizing TDD antenna system that includes an antenna circuit with a transmission line measurement circuit to determine signal loss and an amplitude adjustment circuit to adjust transmit and receive signals based on this loss, allowing operation independent of user system communication and cable length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active communication with user system is required to adjust signal power, then signal power can be adjusted according to user system feedback, but system complexity increases and installation flexibility decreases
Solution Approach 1:
The antenna system performs self-calibration by generating a calibration signal, measuring its own cable loss through the transmission line, and automatically adjusting signal amplitudes without requiring communication with the user system. The controller switches between calibration mode and communication mode, enabling the system to self-diagnose and self-adjust parameters.
Solution Approach 2:
The system performs cable loss measurement and amplitude adjustment in advance during a calibration phase before actual communication begins. By pre-determining the cable loss characteristics and configuring the amplitude adjustment circuit accordingly, the system eliminates the need for continuous communication during operation.
2Measurement precision
If cable length is fixed, then signal loss can be accurately determined, but installation flexibility and adaptability decrease
Solution Approach 1:
The antenna system automatically measures the actual cable loss through the transmission line during calibration, regardless of cable length or installation conditions. The measurement circuit sends a calibration signal through the cable and measures the returned signal to determine the actual loss, adapting to any cable configuration without requiring pre-knowledge of cable specifications.
Solution Approach 2:
The system dynamically adjusts signal amplitudes based on the measured cable loss parameter. By changing the amplitude parameter according to the determined loss characteristics, the system compensates for variations in cable length and installation conditions, maintaining optimal signal levels across different configurations.
3Reliability
If amplitude adjustment circuit operates continuously in both modes, then signal quality is maintained, but energy consumption increases
Solution Approach 1:
The amplitude adjustment circuit operates periodically by switching between calibration mode and communication mode rather than continuously. The controller enables the adjustment circuit only when needed for calibration or active communication, turning it off during idle periods to reduce energy consumption while maintaining signal quality when operational.
Data Source
AI summary
One example includes a self-synchronizing TDD antenna system. The system includes an antenna to communicate transmit and receive signals and an antenna circuit coupled to a user communication system via a transmission line cable. The antenna circuit includes a transmission line measurement circuit to determine signal loss through the transmission line cable and an amplitude adjustment circuit to adjust amplitude of the transmit and/or receive signals based on the determined signal loss. The antenna circuit also includes a transmit detection circuit to monitor signal power of the transmit signal, and a controller to switch the amplitude adjustment circuit from a receive mode to a transmit mode in response to the monitored signal power exceeding a predetermined threshold. In the receive mode, the adjustment circuit applies a receive amplitude adjustment to the receive signal, and in the transmit mode the adjustment circuit applies a transmit amplitude adjustment to the transmit signal.