Harmonic Estimation and Cancellation in Wireless Signal Reception
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Solution Overview
Problem
Wireless communication networks face performance degradation due to harmonics, which can be active or passive, especially in multi-band, multi-carrier transmissions, leading to receiver desensitization and reduced signal quality.
Innovation Solution
An apparatus and method that transmit a first signal, detect and estimate harmonics caused by the transmission, and subtract the harmonic estimation from the received signal to improve receiver sensitivity and mitigate noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-band, multi-carrier transmissions are implemented in FDD deployments, then network capacity and coverage are improved, but harmonics are generated that degrade receiver performance
Solution Approach 1:
The patent converts the harmful harmonic signal into a beneficial cancellation opportunity by estimating the harmonic based on the transmitted signal and subtracting it from the received signal. This transforms the harmful interference into a controlled subtraction operation that improves receiver sensitivity while maintaining multi-band, multi-carrier transmission capabilities.
Solution Approach 2:
The patent performs preliminary estimation of the harmonic signal before the actual reception and processing of the desired signal. By calculating the expected harmonic based on the transmitted signal characteristics in advance, the system prepares the cancellation component ready to remove the interference, thereby improving receiver performance without affecting the main transmission functionality.
2Temperature
If transmitter power is increased to improve signal coverage, then coverage area is expanded, but harmonic distortion increases causing receiver desensitization
Solution Approach 1:
The patent converts the harmful effect of increased harmonic distortion (caused by higher transmitter power) into a beneficial outcome by explicitly estimating and canceling the harmonic component. This allows the system to operate at higher power levels for improved coverage while maintaining signal quality through digital harmonic cancellation.
3Measurement precision
If receiver sensitivity is improved by filtering out harmonics, then signal-to-noise ratio is enhanced, but device complexity increases due to additional processing
Solution Approach 1:
The patent replaces complex physical filtering mechanisms with a digital signal processing approach. Instead of using additional hardware filters that would increase device complexity, the system uses mathematical estimation and subtraction operations to remove harmonics, achieving the same filtering effect with simpler digital processing.
Data Source
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AI summary
Disclosed is a method comprising transmitting a first signal, obtaining an indication of a harmonic, wherein the harmonic is caused by the transmission of the first signal, determining, based on the indication of the harmonic, an estimation of the harmonic, receiving a second signal, wherein the second signal comprises the harmonic, and subtracting the estimation of the harmonic from the second signal.