RF Link Calibration Using Digital Attenuators for Gain Balance
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Solution Overview
Problem
The installation of distributed antenna systems is hindered by hardware differences and varying optical fiber lengths, leading to line loss and requiring significant manual adjustments, which consume human resources and extend debugging cycles.
Innovation Solution
A calibration method and apparatus for radio frequency links using automatic calibration functions in near-end, relay, and far-end devices, employing digital ATT modules and successive approximation methods to adjust signal power levels, reducing manual intervention and optimizing link gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment is performed to compensate for hardware differences and optical fiber length variations, then the RF link gain can be balanced, but significant human resources and long debugging time are consumed
Solution Approach 1:
The system performs automatic calibration without manual intervention. The calibration module automatically generates test signals, measures the RF link gain, and adjusts the gain of each optical module to achieve balanced output power across all channels, eliminating the need for manual debugging and significantly reducing deployment time
Solution Approach 2:
The calibration process uses feedback mechanisms where the system measures the actual output power of each channel and automatically adjusts the gain accordingly. The calibration module continuously monitors and compensates for hardware differences and optical fiber length variations to maintain precise RF link gain balance
2Manufacturing precision
If manual adjustment is performed to compensate for hardware differences and optical fiber length variations, then the RF link gain can be balanced, but significant human resources are consumed
Solution Approach 1:
The calibration module automatically performs all necessary measurements and adjustments without requiring technician intervention. The system self-calibrates by generating test signals, measuring channel responses, and adjusting optical module gains automatically, transforming a complex manual process into an automated self-service operation
Solution Approach 2:
The patent replaces manual mechanical adjustment operations with automated electronic calibration. Instead of technicians physically adjusting components, the system uses electronic signal generation, automated measurement, and digital control to achieve precise RF link gain balance, significantly reducing labor requirements
3Productivity
If automatic calibration is implemented to reduce manual intervention, then deployment efficiency is improved, but system complexity increases
Solution Approach 1:
The calibration module serves multiple functions: it generates test signals, measures RF link gain, controls optical module gains, and validates calibration results. By consolidating these diverse functions into a single multi-functional module, the system achieves high deployment efficiency without proportionally increasing overall system complexity
Solution Approach 2:
The patent combines signal generation, measurement, and control functions into an integrated calibration module. This merging of previously separate functions into a unified automated system improves deployment efficiency while managing complexity through functional integration rather than proliferation of separate components
Data Source
AI summary
A calibration method for a radio frequency (RF) link includes generating, by a signal source module, a first signal with a predetermined frequency in a near-end device, adjusting, by a first digital ATT module, the first signal to generate a second signal with a first predetermined power level, and adjusting, by a second digital ATT module of a first optical module in the near-end device, the second signal to cause an input signal or an output signal of the first optical module to have a second predetermined power level, the first optical module being connected to the signal source module via an optical fiber.