Software-Defined Radio Interface for Average-Power PA Protection
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Solution Overview
Problem
Existing software radios face challenges in protecting their power amplifiers from degradation due to excessive power thresholds, which can be temporary in applications like 4G or 5G, and current solutions require additional components, increasing cost and complexity, and are not adaptable to signal or amplifier changes.
Innovation Solution
Integrating a power amplifier protection unit into the physical interface of the software radio, which calculates and compares the average power of digital signals over a predefined period, reducing instantaneous power when the average exceeds a threshold, without requiring additional components, and allowing for adaptability to signal and amplifier changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current monitoring solutions are implemented to protect the power amplifier, then the amplifier is protected from damage, but the device complexity and cost increase due to additional physical components
Solution Approach 1:
The protection function is merged with the existing physical interface (FPGA or ASIC) by integrating a protection unit within it. This combines the interface functionality with the protection monitoring capabilities, eliminating the need for separate protection hardware components while maintaining amplifier protection.
Solution Approach 2:
The physical interface is enhanced to perform multiple functions: it serves as both the data interface between CPU and DAC and as a protection monitoring unit. The protection unit within the physical interface can monitor power levels and control the power amplifier, making the interface universal and multi-functional.
2Reliability
If current monitoring solutions are implemented to protect the power amplifier, then the amplifier is protected from damage, but the cost increases due to additional physical components
Solution Approach 1:
The protection function is merged with the existing physical interface (FPGA or ASIC) by integrating a protection unit within it. This combines the interface functionality with the protection monitoring capabilities, eliminating the need for separate protection hardware components while maintaining amplifier protection.
3Reliability
If current monitoring solutions are implemented to protect the power amplifier, then the amplifier is protected from damage, but the adaptability to signal and amplifier changes is reduced
Solution Approach 1:
The protection unit is implemented as a configurable software module within the physical interface that can dynamically adapt its monitoring parameters and thresholds based on the specific signal characteristics and power amplifier being used. This dynamic configuration capability enables the system to adapt to changes without hardware modifications.
Solution Approach 2:
The protection function allows parameter changes in the monitoring thresholds and reference periods based on the specific application requirements, signal types, and power amplifier characteristics. This parameter configurability provides adaptability to different scenarios while maintaining a single hardware architecture.
4Reliability
If instantaneous power monitoring is used to protect the power amplifier, then the amplifier is protected from immediate damage, but legitimate temporary power exceedances in 4G/5G applications are incorrectly blocked
Solution Approach 1:
The protection unit monitors power over a reference period (average power) rather than at instantaneous moments. This periodic monitoring approach with a defined reference period allows temporary power exceedances typical in 4G/5G applications while protecting against sustained excessive power that would cause damage.
Data Source
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Figure 3~4
AI summary
The invention relates to a software-defined radio (200) comprising: - at least one processor (104) producing a digital signal, - a digital-to-analog converter (DAC) (106) for converting said digital signal into an analog signal, - a physical interface (110) between the processor (104) and the DAC, and - a radio frequency power amplifier (108) for amplifying the power of said analog signal; said software-defined radio (200) further comprising, arranged in said physical interface (110), a protection unit (202) for said power amplifier (108) based on: - the average power, over a predefined reference period, of the digital signal received by said physical interface (110), - a predefined power threshold not to be exceeded during said period. It also relates to an electronic device comprising such a digital radio and a method for protecting a software-defined radio.