Collocated RF Sensitivity Adjustment for Interference Mitigation
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Solution Overview
Problem
Communication systems with collocated communication circuitry face interference from blocking RF signals, leading to increased packet error rates due to frequency, intermodulation, and harmonic interference, which hinders the accurate decoding of wanted RF signals.
Innovation Solution
A sensitivity adjustor is implemented in the communication circuitry to dynamically adjust the receive sensitivity based on received signal strength indicators (RSSI) values of both wanted and blocking signals, using gain adjustment values to mitigate interference by optimizing the amplification of RF signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If collocated communication circuitry operates multiple protocols simultaneously, then communication versatility is improved, but RF signal interference increases causing packet errors
Solution Approach 1:
A sensitivity adjustor is introduced as an intermediary component between the RF signal reception and the communication protocol processing. This adjustor dynamically modifies the receive sensitivity based on detected blocking signals, thereby mediating the interference between multiple protocols and allowing them to coexist without mutual degradation
Solution Approach 2:
The system dynamically changes the receive sensitivity parameter based on the detected signal conditions. When blocking signals are detected, the sensitivity adjustor modifies the sensitivity parameter to prevent overload and distortion, thereby maintaining reliable communication across multiple protocols under varying interference conditions
2Measurement precision
If receive sensitivity is increased to improve signal detection, then wanted signal reception is improved, but blocking signal interference worsens causing decoding errors
Solution Approach 1:
The receive sensitivity is made dynamic rather than fixed. The sensitivity adjustor continuously monitors for blocking signals and adjusts the sensitivity in real-time, allowing the system to optimize wanted signal detection while adapting to changing interference conditions that would otherwise cause decoding errors
Solution Approach 2:
A feedback mechanism is implemented where the system detects the presence and strength of blocking signals, then feeds this information back to the sensitivity adjustor. The adjustor uses this feedback to modify the receive sensitivity, creating a closed-loop system that balances wanted signal detection with interference rejection
3Reliability
If sensitivity adjustment is implemented to reduce packet errors, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The sensitivity adjustor is designed as a universal component that can serve multiple communication protocols simultaneously. By implementing a single multi-functional adjustor rather than separate adjustment mechanisms for each protocol, the solution improves packet decoding success across all protocols while minimizing the increase in overall device complexity
Data Source
AI summary
Example systems and methods of a wireless device use first communication circuitry of the wireless device to determine a first signal level associated with a first radio frequency signal and use second communication circuitry of the wireless device to determine a second signal level associated with a second radio frequency signal. Systems and methods generate a sensitivity adjustment value based on the first signal level and the second signal level, and use the sensitivity adjustment value to process a combined signal comprising the first radio frequency signal and the second radio frequency signal.