Receiver AGC Mode Switching for Sensitivity and Blocking Trade-Off
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Solution Overview
Problem
Existing radio receivers face challenges in optimizing gain control across different modulation coding scheme (MCS) conditions and bandwidths, as sensitivity and blocking performance overlap, making it difficult to achieve optimal noise and linearity performance in real-time.
Innovation Solution
The receiver is configured to dynamically switch between two automatic gain control (AGC) modes: AGC SENS mode for optimizing noise performance and AGC ACI mode for optimizing linearity and headroom. This is achieved through a controller that adjusts the gain settings of various gain components based on power detector signals, allowing for quick updates to maintain optimal performance across changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single AGC mode is used, then the receiver can be simpler to implement, but it cannot optimize both sensitivity and blocking performance across different MCS conditions
Solution Approach 1:
The AGC control is divided into two distinct modes (AGC SENS mode and AGC ACI mode), each optimized for specific operational conditions. The controller selects between these segmented modes based on detected signal conditions, allowing optimal performance for both sensitivity-critical and blocking-critical scenarios without requiring a single complex adaptive system.
Solution Approach 2:
The receiver dynamically switches between AGC SENS mode and AGC ACI mode based on real-time detection of signal conditions. This dynamic adaptation allows the system to optimize performance for different MCS conditions and bandwidths, transitioning from sensitivity optimization to blocking performance optimization as needed.
2Measurement precision
If maximum gain is applied for sensitivity optimization, then noise performance improves, but blocking performance deteriorates due to saturation from strong signals
Solution Approach 1:
The gain control dynamically adjusts between maximum gain (for sensitivity) and reduced gain (for blocking resistance) by switching between AGC SENS mode and AGC ACI mode. Power detectors monitor signal levels and trigger mode transitions, allowing the system to apply maximum gain only when signal conditions warrant it, otherwise maintaining lower gain to prevent saturation from blockers.
Solution Approach 2:
The system changes the gain parameter based on detected signal conditions. In AGC SENS mode, maximum gain is applied to optimize noise performance, while in AGC ACI mode, gain is reduced to prevent saturation from strong blocking signals. This parameter change is controlled by power detectors that monitor RF and IF signal levels.
3Reliability
If gain is reduced to improve blocking performance, then linearity improves, but sensitivity and noise performance deteriorate
Solution Approach 1:
The gain control is segmented into two operational regimes: AGC SENS mode with maximum gain for noise optimization, and AGC ACI mode with reduced gain for linearity optimization. This segmentation allows the system to achieve good noise performance when blockers are absent while maintaining linearity when blockers are present, without compromising either aspect in a single mode.
Data Source
AI summary
In one embodiment, a method includes: setting, via a controller of a receiver, a plurality of gain components of the receiver for a maximum gain setting for an automatic gain control (AGC) sensitivity (SENS) mode; receiving, in a controller of the receiver, an indication that a power level of an intermediate frequency (IF) signal measured at an output of an IF amplifier of the receiver exceeds a first threshold; and transitioning from an AGC SENS mode to an AGC adjacent channel interference (ACI) mode in response to the indication that the power level of the IF signal exceeds the first threshold.