Cross-Channel Equalization in Wireless Transceivers for Clutter Cancellation
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Solution Overview
Problem
High-frequency wireless communications face challenges in maintaining performance within the Federal Communications Commission's Maximum Permitted Exposure (MPE) limit due to self-made interference and environmental clutter, which can degrade detection accuracy and increase power density, especially in proximity detection scenarios.
Innovation Solution
Implementing cross-channel equalization in wireless transceivers to attenuate mutual coupling and modulated spurs using an interference and clutter cancellation module, which processes signals from multiple feed ports to suppress slow and fast time-varying components, enabling accurate proximity detection and compliance with MPE guidelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If transmit power levels are increased to compensate for higher path loss, then communication range is improved, but power density increases causing MPE limit violations
Solution Approach 1:
The patent converts harmful self-made interference and environmental clutter into useful reference signals for proximity detection. By treating these interference components as carry signals that contain information about nearby objects, the system transforms a liability into an asset, enabling simultaneous communication and sensing functions
Solution Approach 2:
The patent enables the wireless communication system to perform multiple functions simultaneously: standard data transmission and proximity detection/environmental mapping. The same transmit signals are used for both communication and sensing purposes, eliminating the need for separate dedicated sensing hardware and allowing the system to adapt to different operational modes
2Length of moving object
If transmit power levels are increased to compensate for higher path loss, then communication range is improved, but false alarm rate increases due to interference
Solution Approach 1:
The patent implements feedback mechanisms where the receiver processes reflected and scattered signals to generate information about the electromagnetic environment. This feedback is used to update proximity detection algorithms and adjust transmission parameters, creating a closed-loop system that continuously adapts to environmental conditions and reduces false alarms
Solution Approach 2:
The patent converts harmful self-made interference and environmental clutter into useful reference signals for proximity detection. By treating these interference components as carry signals that contain information about nearby objects, the system transforms a liability into an asset, enabling simultaneous communication and sensing functions
3Ease of manufacture
If device size is reduced to lower cost, then manufacturing cost decreases, but ability to handle interference and clutter deteriorates
Solution Approach 1:
The patent enables the wireless communication system to perform multiple functions simultaneously: standard data transmission and proximity detection/environmental mapping. The same transmit signals are used for both communication and sensing purposes, eliminating the need for separate dedicated sensing hardware and allowing the system to adapt to different operational modes
Solution Approach 2:
The patent implements self-service mechanisms where the system uses its own transmit signals as reference signals for interference cancellation. The receiver processes reflected and scattered signals to generate information about the electromagnetic environment, which is then used to improve detection accuracy without requiring external calibration or additional reference sources
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
Enhances wireless performance by reducing false alarms and allowing higher transmission power levels while adhering to MPE limits, facilitating longer-range communication and reducing device size and cost by utilizing existing hardware and real-time adaptation.
Implementation Method 1
transmit an electromagnetic signal using a first feed port of multiple feed ports
Implementation Method 2
receive two versions of a receive signal respectively via two feed ports of the multiple feed ports. The receive signal comprises a mutual-coupling component associated with the transmission of the electromagnetic signal and the modulated spur
Implementation Method 3
generate a filtered signal by attenuating the mutual-coupling component and the modulated spur within one of the two versions of the receive signal using cross-channel equalization
Data Source
AI summary
An apparatus is disclosed that implements interference and/or clutter cancellation using cross-channel equalization. In example aspects, the apparatus includes a wireless transceiver configured to be connected to multiple feed ports. The wireless transceiver is also configured to transmit an electromagnetic signal using a first feed port of the multiple feed ports. A modulated spur is generated based on the transmission of the electromagnetic signal. The wireless transceiver is additionally configured to receive two versions of a receive signal respectively via two feed ports of the multiple feed ports. The receive signal comprises the modulated spur and a mutual-coupling component associated with the transmission of the electromagnetic signal. The wireless transceiver is further configured to generate a filtered signal by attenuating the mutual-coupling component and the modulated spur within one of the two versions of the receive signal using cross-channel equalization.