Calibration Circuit for Distributed Antenna Phase Synchronization
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Solution Overview
Problem
Distributed MIMO systems require external measuring instruments for individual calibration of distributed antenna parts, which is inconvenient and inefficient.
Innovation Solution
A calibration circuit that includes a detection unit to reflect local oscillation signals from distributed antenna parts and a phase adjustment unit to synchronize phases without external instruments, using variable phase shifters to adjust phases based on detected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external measuring instruments are used for individual calibration of distributed antenna parts, then calibration accuracy is ensured, but installation convenience and efficiency deteriorate
Solution Approach 1:
The system performs self-calibration by utilizing the local oscillation signals generated within the remote unit itself. The detection unit detects reflected local oscillation signals from distributed antenna parts, and the phase adjustment unit automatically adjusts phases without requiring external measuring instruments, enabling the system to calibrate itself.
Solution Approach 2:
The calibration circuit operates by detecting reflected local oscillation signals from distributed antenna parts and using this feedback information to automatically adjust phase shifts. The phase adjustment unit modifies phase shifts based on the detected signal characteristics, creating a closed-loop feedback system that ensures accurate calibration.
2Measurement precision
If external measuring instruments are used for individual calibration of distributed antenna parts, then calibration accuracy is ensured, but calibration time and efficiency deteriorate
Solution Approach 1:
The patent combines multiple calibration functions into a single integrated calibration circuit. The detection unit and phase adjustment unit work together to perform calibration for all distributed antenna parts simultaneously, eliminating the need for separate external measuring instruments and sequential calibration processes.
Solution Approach 2:
The system performs self-calibration by utilizing the local oscillation signals generated within the remote unit itself. The detection unit detects reflected local oscillation signals from distributed antenna parts, and the phase adjustment unit automatically adjusts phases without requiring external measuring instruments, enabling the system to calibrate itself.
3Reliability
If individual calibration is performed for each distributed antenna part, then transmission and reception characteristics are optimized, but device complexity and operational burden increase
Solution Approach 1:
The calibration circuit serves multiple functions: it detects reflected local oscillation signals from all distributed antenna parts, calculates phase shifts for each antenna part, and controls phase shifters to adjust phases. This multi-functional design consolidates what would otherwise require separate external calibration operations for each antenna part.
Solution Approach 2:
The calibration circuit operates by detecting reflected local oscillation signals from distributed antenna parts and using this feedback information to automatically adjust phase shifts. The phase adjustment unit modifies phase shifts based on the detected signal characteristics, creating a closed-loop feedback system that ensures accurate calibration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables phase calibration of distributed antenna parts within a radio base station system without the need for external measuring instruments, improving efficiency and installation convenience.
Implementation Method 1
a detection unit configured to detect a plurality of local oscillation signals, the plurality of local oscillation signals being output from a local oscillator of the remote unit part and being respectively reflected from the plurality of distributed antenna parts through the plurality of cables
Implementation Method 2
a phase adjustment unit configured to adjust a phase of each of the plurality of local oscillation signals that are output through the plurality of respective cables from the remote unit part based on a result of the detection
Data Source
AI summary
A calibration circuit 2 according to the present disclosure is a calibration circuit 2 in a radio base station system 1 including a remote unit part 10 and a plurality of distributed antenna parts 20 connected to the remote unit part 10 through a plurality of respective cables, the calibration circuit 2 including: a detection unit 2a configured to detect a plurality of local oscillation signals that are output from a local oscillator 13 of the remote unit part 10 and are respectively reflected from the plurality of distributed antenna parts 20 through the plurality of cables; and a phase adjustment unit 2b configured to adjust a phase of each of the plurality of local oscillation signals output through the plurality of respective cables from the remote unit part 10 based on a result of the detection.