Wireless Receiver AGC Using ADC Clipping Feedback
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Solution Overview
Problem
Conventional wireless communication receivers face challenges in effectively adjusting signal amplitude for proper processing, leading to signal clipping or underutilization due to the need for complex RSSI mapping tables and circuits, which increase design costs and reduce efficiency.
Innovation Solution
A wireless communication receiver and AGC method that utilize an RF circuit and ADC to adjust the gain index based on the clipping number, allowing for dynamic amplification or reduction of wireless signals to match the processing range, eliminating the need for complex RSSI mapping tables and circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional RSSI mapping table and RSSI circuit are used to adjust signal amplitude, then signal amplitude can be controlled, but design costs increase due to additional storage unit and circuit components
Solution Approach 1:
The patent extracts and removes the RSSI circuit and storage unit from the conventional receiver structure. Instead of using dedicated RSSI hardware components, the invention utilizes the existing ADC clipping number information to infer signal strength and control gain, thereby eliminating unnecessary circuitry while maintaining amplitude control functionality.
Solution Approach 2:
The patent makes the ADC serve multiple functions: not only converting analog signals to digital signals but also providing clipping number information that is used for gain control. This multi-functional use of the ADC eliminates the need for separate RSSI measurement circuits, reducing overall system complexity.
2Productivity
If signal amplitude is not appropriately adjusted, then circuit design is simpler, but signal processing effectiveness deteriorates due to clipping or underutilization
Solution Approach 1:
The patent implements a feedback mechanism where the clipping number from the ADC is used to adjust the gain index of the VGA. The processing circuit continuously monitors clipping events and dynamically adjusts the variable gain amplifier to optimize signal amplitude, ensuring effective utilization of the ADC's dynamic range without requiring complex pre-calibration circuits.
Solution Approach 2:
The system uses its own ADC clipping number information to automatically control its gain, making the amplitude control self-regulating. The receiver leverages inherent operational data (clipping counts) to adjust its own performance, eliminating the need for external RSSI measurement infrastructure.
Data Source
AI summary
A wireless communication receiver includes a circuit, an analog-to-digital converter (ADC) and a processing circuit. The circuit receives a wireless signal and outputs an analog signal according to a gain index. The ADC converts the analog signal to a digital signal. The processing circuit adjusts the gain index according to a clipping number of the ADC.