Adaptive RF Gain Conditioning for ADC Dynamic Range Limits
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Solution Overview
Problem
Current wireless communication systems, particularly 4G, face challenges in achieving the enhanced spectral efficiency, reduced latency, and increased data transfer speeds required by the 5G standard, especially in managing radio-frequency signals to ensure proper operation within the dynamic range of downstream conversion circuits.
Innovation Solution
A radio-frequency signal preconditioning apparatus and method that includes a variable gain circuit to adjust radio-frequency signals from an antenna, providing gains that span a specific range, and outputting these signals to a conversion circuit capable of converting analog signals to digital baseband signals, ensuring the signals fall within the dynamic range of the conversion circuit, even if initially outside this range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed gain is used in the radio-frequency signal processing, then the device complexity is reduced, but the adaptability to different signal conditions deteriorates
Solution Approach 1:
The patent implements a variable gain circuit that can dynamically adjust its gain value based on the received signal conditions. The circuit transitions from a static fixed-gain architecture to a dynamic adaptive-gain architecture, allowing the system to optimize performance for different signal strengths and interference levels while maintaining manageable complexity through structured design.
Solution Approach 2:
The patent changes the gain parameter of the radio-frequency circuit from a fixed value to a variable value that can be adjusted according to signal conditions. This parameter change enables the system to adapt to varying signal environments, improving both spectral efficiency and robustness without requiring complete redesign of the signal processing architecture.
2Adaptability or versatility
If the dynamic range of the variable gain circuit is much larger than the conversion circuit, then the signal processing flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent divides the signal processing system into distinct functional blocks: a variable gain circuit with large dynamic range and a conversion circuit with limited dynamic range. This segmentation allows each block to be optimized independently, with the variable gain circuit handling wide dynamic range requirements and the conversion circuit focusing on precise analog-to-digital conversion, thereby managing overall system complexity.
Solution Approach 2:
The variable gain circuit acts as an intermediary between the antenna/receiver and the conversion circuit. It conditions the received signal by adjusting its gain to match the dynamic range requirements of the conversion circuit, thereby enabling flexible signal processing while protecting the conversion circuit from overload and simplifying its design constraints.
3Productivity
If adaptive gain control is implemented, then the spectral efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent implements adaptive gain control that uses feedback from signal quality measurements to adjust the gain of the variable gain circuit. By monitoring signal conditions and dynamically adjusting gain based on this feedback, the system optimizes spectral efficiency and signal quality while maintaining manageable complexity through established feedback control mechanisms.
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
This approach allows for efficient operation of radio-frequency integrated circuits (RFICs) within their dynamic range, improving signal processing and reducing interference, thereby enhancing spectral efficiency and reducing latency in 5G wireless communication systems.
Implementation Method 1
a variable gain circuit configured to receive a radio-frequency signal from an antenna and configured to selectively provide any of a plurality of gains to the radio-frequency signal to produce an output signal
Implementation Method 2
a conversion circuit configured to convert the output signal from an analog signal at a radio frequency to a digital signal at a baseband frequency
Data Source
AI summary
A radio-frequency signal preconditioning method includes: receiving, at a radio-frequency signal preconditioning apparatus from an antenna, a radio-frequency signal; selectively providing, at the radio-frequency signal preconditioning apparatus, any of a plurality of gains to the radio-frequency signal to produce an output signal, the plurality of gains spanning a first range; and providing, from the radio-frequency signal preconditioning apparatus, the output signal to a conversion circuit configured to convert the output signal from an analog signal at a radio frequency to a digital signal at a baseband frequency, the conversion circuit having a dynamic range spanning a second range that is smaller than the first range.