Wireless Receiver Gain Control for Interference Overload Prevention
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Solution Overview
Problem
Conventional wireless signal receivers face interference issues when multiple wireless signals are transmitted simultaneously, leading to front end overload due to inadequate detection and gain control mechanisms, particularly in the presence of WiFi and Bluetooth signals.
Innovation Solution
A gain control method and module that continuously monitors wideband channels for interference signals, calculates an interference RSSI, and prohibits the use of maximum front end gain to prevent overload, utilizing a wideband RF impulse detector, ADC, and BB/DSP circuit to adjust the front end gain accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the front end gain is increased to improve signal reception sensitivity, then the reception sensitivity is improved, but the front end overload occurs due to interference signals
Solution Approach 1:
The patent performs preliminary detection of interference signals before the actual signal reception. The detection unit continuously monitors the wideband channel to identify potential interference signals, and based on this preliminary detection, the gain control unit adjusts the front end gain in advance to prevent front end overload before it occurs
Solution Approach 2:
The patent implements a feedback mechanism where the detection unit continuously monitors the wideband channel for interference signals, and the gain control unit adjusts the front end gain based on the detection results. This closed-loop feedback system dynamically optimizes the gain to maintain reception sensitivity while preventing front end overload
2Object-affected harmful factors
If the gain is decreased to avoid front end overload from interference signals, then the front end overload is prevented, but the reception sensitivity deteriorates
Solution Approach 1:
The patent applies different gain values to different frequency bands based on local interference conditions. The gain control unit determines a first gain value for the frequency band containing the interference signal and a second gain value for other frequency bands, allowing optimal reception sensitivity in interference-free bands while preventing overload in affected bands
Solution Approach 2:
The patent dynamically adjusts the front end gain based on real-time interference detection. The gain control unit changes the gain value according to the detected interference signal characteristics, transitioning between different gain states to optimize performance under varying interference conditions
3Speed
If the switch is turned on to bypass the band-pass filter for faster processing, then the processing speed is improved, but the interference signal detection accuracy deteriorates
Solution Approach 1:
The patent segments the signal processing path into different routes. The detection unit can selectively use the wideband channel for interference detection without requiring the full signal processing chain, allowing parallel processing of interference detection and signal reception to improve overall system speed while maintaining detection accuracy
Data Source
AI summary
An exemplary embodiment of a method illustrates a gain control method executed in a wireless signal receiver. The gain control method has the following steps. A wideband channel is continuously monitored to check whether an interference signal exists in a wireless signal. When the interference signal exists in the wireless signal, an interference received signal strength indicator is obtained. A front end gain of the wireless signal receiver is controlled according to the interference received signal strength indicator. When the interference signal exists in the wireless signal, the wireless signal receiver is prohibited from using a maximum front end gain.