Double-Balanced Duplexer Feedback Paths for Leakage Cancellation
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Solution Overview
Problem
Current wireless communication devices face interference and reduced data reliability due to noise and leakage from power amplifiers and non-ideal electrical components in isolation circuitry, which affect the integrity of received signals during full duplex operations.
Innovation Solution
The implementation of auxiliary signal paths with phase and gain adjustment circuitry to provide feedback signals that cancel leakage current and noise, including bandpass filters to prevent distortion, effectively isolating transmission signals from receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical components (e.g., baluns) are used to isolate transmitter from received signals and receiver from transmission signals, then isolation between transmission signal and receiver is provided, but less than ideal isolation is achieved due to non-ideal characteristics of real-world electrical components, leading to leakage of transmission signal to receiver
Solution Approach 1:
The patent implements feedback paths that capture leakage signals from the transmitter and feed them back to the receiver with inverted polarity. This active feedback mechanism dynamically cancels the leakage signal at the receiver input, compensating for the non-ideal isolation characteristics of passive electrical components like baluns and duplexers.
Solution Approach 2:
The patent converts the harmful leakage signal into a beneficial cancellation signal by capturing the leakage through feedback paths, inverting its polarity, and re-injecting it at the receiver. This transforms the harmful interference into a useful counter-signal that actively neutralizes the leakage, turning a system weakness into a solution.
2Power
If power amplifier amplifies transmission signal to provide sufficient transmission power, then transmission power is sufficient, but noise is introduced to transmission signals that results in interference and reduced data reliability at receiver
Solution Approach 1:
The patent implements feedback paths that capture noise signals generated by the power amplifier and feed them back to the receiver with inverted polarity. This allows the receiver to actively cancel the amplifier-induced noise, enabling the system to maintain high transmission power while preserving signal integrity at the receiver.
Solution Approach 2:
The patent converts the harmful noise generated by the power amplifier into a beneficial cancellation signal. By capturing the noise through feedback, inverting its polarity, and re-injecting it at the receiver, the system transforms the amplifier's harmful byproduct into a useful tool for noise cancellation, allowing high-power operation without compromising receiver sensitivity.
3Productivity
If full duplex operations are enabled to increase amount of data able to be sent and received and decrease time between sending and receiving, then data throughput increases, but transmission signals leak to receiver causing interference
Solution Approach 1:
The patent implements feedback paths in the full duplex system that capture self-interference signals from the transmitter and feed them back to the receiver with inverted polarity. This active cancellation mechanism enables simultaneous transmission and reception by dynamically neutralizing the leakage, allowing the system to achieve high data throughput without self-interference degradation.
Solution Approach 2:
The patent converts the harmful self-interference inherent in full duplex operation into a beneficial cancellation signal. By capturing the leakage through feedback paths, inverting its polarity, and re-injecting it at the receiver, the system transforms the fundamental limitation of full duplex operation into an active solution, enabling simultaneous transmit and receive operations at high data rates.
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 solution significantly reduces interference and enhances data reliability by effectively canceling leakage and noise signals, improving the integrity of received signals in wireless communication devices.
Implementation Method 1
The phase adjustment circuitry may adjust a phase of the feedback signal to compensate for a leakage or noise signal
Implementation Method 2
The first auxiliary signal path may provide the first feedback signal 180 degrees out of phase compared to the transmission signal to cancel the leakage current
Implementation Method 3
The gain adjustment circuitry may adjust a current or an amplitude of the first feedback signal to reduce or cancel the leakage current
Implementation Method 4
the first auxiliary signal path may include a bandpass filter to prevent the noise signals from distorting the first feedback signal
Data Source
AI summary
Systems and method are described for improving electrical isolation between a transmission signal and receiver circuitry of a transceiver communicating over one or more wireless networks via one or more shared antennas. The transceiver may include isolation circuitry to facilitate isolation of the transmission signal from the receiver circuitry. However, a leakage current of the transmission signal and noise signals may appear at the receiver circuitry. Presence of the leakage current or the noise signals in the receiver circuitry may cause interference with the reception signal. As such, the isolation circuitry may benefit from additional isolation between the transmission signal and the receiver circuitry to reduce an effect of the leakage current and the noise signals on the reception signal.