Receiver Gain Control Using Multi-Stage 1-Bit Clip Detection
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Solution Overview
Problem
Conventional wireless communication systems face challenges in maintaining optimal signal strength across varying signal conditions, leading to potential clipping and distortion at the analog-to-digital converter input, which affects the signal-to-quantization noise ratio and receiver performance.
Innovation Solution
The implementation of a receiver chain with multiple signal strength indication circuits at various gain stages, which generate 1-bit clip information signals to estimate signal strength and adjust the receiver gain, ensuring the signal is within the optimal range for the analog-to-digital converter, thereby preventing clipping and maximizing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional automatic gain control is used to maintain optimal signal strength, then signal quality is improved, but power consumption increases
Solution Approach 1:
The receiver chain is divided into multiple gain stages, each with its own signal strength indication circuit. This segmentation allows distributed measurement functionality across stages, enabling accurate signal strength estimation while using simple 1-bit clip information signals that consume minimal power compared to centralized conventional AGC approaches.
Solution Approach 2:
The patent changes the measurement parameter from continuous analog signal strength values to discrete 1-bit clip information signals. This parameter transformation maintains sufficient accuracy for gain control decisions while dramatically reducing the power consumption and complexity of the measurement circuits.
2Measurement precision
If multiple signal strength indication circuits are implemented at various gain stages, then signal strength estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The system segments the gain control function across multiple stages, with each stage having a simple signal strength indication circuit. This distributed segmentation provides comprehensive signal strength information throughout the receiver chain while keeping each individual circuit simple and low-complexity.
Solution Approach 2:
Instead of using complex continuous measurement circuits, the patent inverts the approach by using simple 1-bit clip detection circuits. These inverted simple circuits provide sufficient information for accurate signal strength estimation when combined across multiple stages, reducing overall device complexity.
3Measurement precision
If signal strength is maintained within optimal range, then signal-to-quantization noise ratio is improved, but signal clipping occurs under varying conditions
Solution Approach 1:
The patent implements feedback control by using signal strength indication circuits that provide clip information signals back to the gain control mechanism. This feedback loop continuously monitors signal strength at multiple gain stages and adjusts gain settings to maintain optimal signal levels, preventing both clipping and excessive quantization noise while ensuring signal integrity under varying conditions.
Data Source
AI summary
A radio receiver includes a plurality of receiver signal strength indicator (RSSI) circuits coupled to respective output taps of various gain stages along the receiver chain. Each of the RSSI circuits generates a respective 1-bit clip information signal. A processor accumulates the clip information signals to estimate the signal strength of an inbound RF signal and sets a gain of the radio receiver based on the estimated signal strength.