RF Receiver AGC Mode Switching for Jamming and Sensitivity
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Solution Overview
Problem
Conventional wireless receivers, particularly in C-V2X communication, face challenges with bandpass filters degrading noise figure and causing unnecessary desensing when jamming signals are not present, leading to reduced receiver sensitivity.
Innovation Solution
Implementing a wireless receiver with dual operating modes: a filter mode to protect against jamming signals and a bypass mode to improve sensitivity when no jamming is present, dynamically switching between these modes based on jamming detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bandpass filter is used in the receiver front-end, then protection against jamming signals is improved, but noise figure degradation occurs causing reduced receiver sensitivity
Solution Approach 1:
The system dynamically switches between filter mode and bypass mode based on jamming detection. The bandpass filter is selectively activated only when jamming signals are detected, and bypassed when no jamming is present, making the receiver configuration adaptive rather than static.
Solution Approach 2:
The system changes the operational parameter of the receiver front-end by switching between two distinct modes: filter mode (with bandpass filter active) and bypass mode (with filter bypassed). This parameter change allows optimization of receiver performance based on external interference conditions.
2Object-affected harmful factors
If the bandpass filter is always activated, then jamming signal rejection is improved, but unnecessary noise figure degradation occurs when no jamming is present
Solution Approach 1:
The bandpass filter is extracted from the always-on configuration and selectively removed from the signal path through the bypass mode. The filter is taken out of the active configuration only when needed, preventing unnecessary noise figure degradation during normal operation.
Solution Approach 2:
The filter activation state is made dynamic rather than static. The system transitions between filter-active and filter-bypassed states based on real-time jamming detection, ensuring the filter is only engaged when providing actual benefit.
3Object-affected harmful factors
If the receiver operates in filter mode continuously, then protection against jamming is maintained, but receiver sensitivity is reduced due to noise figure degradation
Solution Approach 1:
The receiver operates in a dynamic manner, switching between filter mode and bypass mode based on jamming detection results. This dynamic operation allows the receiver to maintain protection only when necessary, preserving sensitivity during normal operation.
Solution Approach 2:
The operational parameter of the receiver front-end is changed between two states: filter mode with degraded noise figure and bypass mode with optimal noise figure. This parameter change optimizes the balance between protection and sensitivity.
Data Source
AI summary
Methods and apparatus for performing automatic gain control (AGC) in bypass and filter modes for radio frequency (RF) front-end circuitry are described. An example method includes operating a receiver in a first mode during a first set of symbols of a first subframe. The method also includes, during a first symbol of the first subframe outside the first set of symbols, determining whether to operate the receiver in the first mode or a second mode in a second subframe, based at least in part on an output of a jamming detection circuit of the receiver in the first symbol. The method also includes controlling the receiver to operate in the first mode or the second mode in the second subframe, in accordance with the determination.