WLAN Receiver AGC Switching During Concurrent Bluetooth Transmission
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Solution Overview
Problem
Current wireless devices face interference issues during simultaneous WLAN and Bluetooth communications, leading to reduced receiver sensitivity due to adjacent channel interference, which is not adequately addressed by existing methods.
Innovation Solution
A method that dynamically adjusts the automatic gain control (AGC) level of the WLAN receiver based on the signal-to-noise ratio (SNR) and environmental conditions, reducing the gain only when necessary to maintain effective signal reception and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the AGC gain level is reduced to mitigate adjacent channel interference during simultaneous Bluetooth transmission and WLAN reception, then interference is reduced, but receiver sensitivity deteriorates
Solution Approach 1:
The patent implements dynamic AGC gain adjustment based on real-time detection of Bluetooth transmission states. The system transitions from static high gain to dynamically adapted gain levels, switching between high sensitivity mode (when Bluetooth is inactive) and interference mitigation mode (when Bluetooth is transmitting), thereby resolving the contradiction between maintaining receiver sensitivity and reducing adjacent channel interference
Solution Approach 2:
The system changes the AGC gain parameter conditionally based on Bluetooth transmission status. When Bluetooth transmission is detected, the AGC gain is reduced from its default high value to a lower value, allowing the system to adapt the receiver gain parameter to current interference conditions while maintaining optimal performance for both scenarios
2Reliability
If the AGC gain level is maintained at high value for improved WLAN receiver performance, then receiver sensitivity is improved, but adjacent channel interference from Bluetooth transmission increases
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors Bluetooth transmission status and uses this information to adjust AGC gain settings. The feedback loop detects when Bluetooth is transmitting and automatically reduces WLAN receiver gain accordingly, preventing interference while maintaining high sensitivity during periods when interference is not present
Solution Approach 2:
The system performs preliminary detection of Bluetooth transmission states before WLAN reception occurs. By detecting the presence of Bluetooth transmission in advance, the system can proactively adjust the AGC gain level to prevent interference before it degrades WLAN receiver performance, rather than reacting after interference has occurred
Data Source
AI summary
A method for adjusting a gain level for a receiver of a first radio simultaneously operational with a transmitter of a second radio, comprising: determining a signal-to-noise ratio (“SNR”) value for signals received by the receiver from an access point (“AP”); and, when the first radio is associated with the AP and the transmitter is not transmitting, if the SNR value exceeds a SNR threshold, reducing the gain level for the receiver from an initial level and initiating transmission from the transmitter, otherwise maintaining the gain level for the receiver at the initial level and initiating transmission from the transmitter; wherein the SNR threshold is a SNR value above which beacon signals from the AP can be successfully received by the receiver.