Configurable Front-End Filter Circuitry for Bluetooth-WLAN Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing information handling systems face significant data throughput reduction due to signal interference between Bluetooth and WLAN communications, as both technologies operate in the same frequency spectrum, with prior solutions either reducing Bluetooth throughput or requiring modifications to signal spectrums.
Innovation Solution
A method and system utilizing configurable front-end filter circuitry to selectively filter out Bluetooth communications based on their frequency location, allowing Bluetooth to hop and adjust while maintaining WLAN communication integrity, thereby optimizing Bluetooth throughput and channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Bluetooth and WLAN operate simultaneously in the same frequency spectrum, then both communication protocols can be used, but signal interference occurs resulting in significant data throughput reduction
Solution Approach 1:
The patent segments the frequency spectrum into distinct WLAN frequency regions and Bluetooth frequency regions. The configurable front-end filter system divides the broadband WLAN receiver input into multiple narrowband filter channels, each tuned to specific WLAN frequencies, thereby separating WLAN signals from Bluetooth signals in the frequency domain and enabling simultaneous operation with minimal interference
Solution Approach 2:
The patent applies different filtering characteristics to different frequency regions. The front-end filter system uses multiple narrowband filters with different center frequencies and bandwidths tailored to specific WLAN channels, providing localized frequency-selective filtering that preserves WLAN signal quality while rejecting Bluetooth interference in specific frequency bands
2Adaptability or versatility
If wideband filters are used to pass entire WLAN spectrum, then WLAN communication is enabled, but no channel selectivity is provided allowing Bluetooth interference
Solution Approach 1:
The patent replaces wideband filters with multiple narrowband filters segmented across the WLAN spectrum. Each narrowband filter is centered on a specific WLAN channel frequency, providing channel-selective filtering that maintains comprehensive WLAN spectrum coverage while selectively rejecting Bluetooth signals that fall outside the narrow WLAN channel bands
Solution Approach 2:
The patent introduces a configurable front-end filter system as an intermediary between the WLAN antenna and the WLAN receiver. This filter system acts as a frequency-selective gatekeeper that allows desired WLAN frequencies to pass while blocking interfering Bluetooth frequencies, thereby protecting the WLAN receiver from out-of-band interference
3Object-affected harmful factors
If Bluetooth transmitter is turned off during WLAN reception, then signal interference is reduced, but Bluetooth throughput is reduced by 90% or more
Solution Approach 1:
The patent implements periodic frequency hopping for Bluetooth communications within frequency regions that are filtered by the front-end filter system. Bluetooth transmits in periodic bursts on different frequencies, and the configurable filters are adjusted to allow these periodic Bluetooth transmissions while maintaining WLAN performance, thereby enabling both protocols to operate simultaneously with acceptable throughput for both
Solution Approach 2:
The patent employs dynamically configurable front-end filters that can be reconfigured based on current WLAN and Bluetooth operating conditions. The filter center frequencies and bandwidths are adjusted in real-time to match active WLAN channels, allowing Bluetooth to operate in frequency regions that are not currently being used by WLAN, thereby maintaining high throughput for both protocols without requiring Bluetooth to remain off
4Object-affected harmful factors
If divided spectrum method is used with fixed communication bandwidths, then interference is reduced, but modification to usable signal spectrums is required
Solution Approach 1:
The patent employs dynamically configurable filters that can be reprogrammed to match different WLAN channel configurations and Bluetooth frequency regions. Rather than using fixed divided spectrum allocations, the filter system adapts its frequency response in real-time based on which WLAN channels are active and where Bluetooth is transmitting, thereby reducing interference without requiring permanent modifications to the usable signal spectrums of either protocol
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces signal interference between Bluetooth and WLAN communications, enhancing Bluetooth throughput and increasing the number of usable channels, while allowing existing co-existence schemes like AFH to operate effectively.
Implementation Method 1
configurable front-end filter circuitry to selectively filter out Bluetooth communications based on their frequency location
Data Source
AI summary
Methods and systems are disclosed for reducing signal interference between Bluetooth (BT) and WLAN (e.g. WiFi) communications in an information handling system. The WLAN receiver has configurable front-end filter circuitry. Based upon information concerning the BT frequency region for current BT communications, the WLAN receiver can adjust or set its configurable front-end filter circuitry to filter out the BT communications. As the BT communications hop from frequency to frequency, the WLAN receiver can continue to adjust its configurable front-end filter circuitry accordingly. Example implementations for the configurable front-end filter circuitry include bandpass filters and selectable low pass and high pass filters. These filters are selected and/or tuned such that BT frequency regions are filtered from the WLAN input signal before further WLAN signal processing is conducted, thereby improving the performance of simultaneous BT and WLAN communications.