Notch Filter Harmonic Spur Mitigation in Wi-Fi Bluetooth Receivers
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Solution Overview
Problem
Wireless communication systems face challenges in mitigating harmonic spurs, which cause signal detection and decoding issues, particularly in portable devices, and existing solutions like linear amplifiers and Time Division Multiplexing are costly and complex for frequency varying harmonic spurs.
Innovation Solution
A notch filter is configured to filter interfering harmonic frequencies, and the received RF signal is transformed into a frequency-domain signal to determine residual harmonic frequency confidence levels, with tone nulling performed on metrics below a threshold to reduce interference, improving signal decoding in portable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linear amplifier design and Time Division Multiplexing are used to mitigate harmonic spurs, then harmonic spur mitigation is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes only the harmful harmonic components from the signal using a notch filter, rather than using a linear amplifier to process the entire signal. This selective extraction approach simplifies the system by targeting only the interference while leaving the useful signal intact, reducing overall device complexity.
Solution Approach 2:
The patent replaces expensive and complex linear amplifiers with a simpler, more cost-effective notch filter implementation. The notch filter uses standard filter components that are less expensive and simpler than linear amplifier circuits, making the solution more affordable for portable devices while achieving the same harmonic mitigation goal.
2Reliability
If linear amplifier design and Time Division Multiplexing are used to mitigate harmonic spurs, then harmonic spur mitigation is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a notch filter design that uses inexpensive, readily available electronic components compared to linear amplifiers. The filter implementation requires standard resistors, capacitors, and filter elements that are cheaper to manufacture, reducing the overall cost of the wireless communication device while maintaining effective harmonic spur mitigation.
3Reliability
If notch filter is used to filter interfering harmonic frequencies, then receiver sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent implements a notch filter that selectively extracts and removes only the harmful harmonic frequencies from the received signal. This targeted approach improves receiver sensitivity by eliminating interference without requiring complex signal processing, as the filter operates independently to remove specific frequency components.
Solution Approach 2:
The notch filter applies local quality by targeting specific frequency bands (the harmonic frequencies) for removal while leaving other parts of the spectrum unaffected. This selective filtering approach improves sensitivity at the problematic frequencies without adding complexity across the entire frequency range, as the filter is tuned to specific interference points.
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
This approach effectively mitigates harmonic spurs, improving receiver sensitivity by up to 5 dB and reducing interference energy, making it a cost-effective solution for portable devices.
Implementation Method 1
filtering the uplink transmission or the interfering noise by a notch filter
Implementation Method 2
the received RF signal is transformed from a time-domain into a frequency-domain RF signal
Data Source
AI summary
Described herein are technologies related to an implementation of harmonic spurs mitigation in a receiver of a portable device.