Simultaneous Wi-Fi Transmit Receive Self-Interference Cancellation
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Solution Overview
Problem
Conventional methods fail to enable simultaneous transmit and receive operations in the same Wi-Fi band within a device due to receiver compression caused by strong signal components, preventing successful spectrum scans in wireless network devices with multiple radio units.
Innovation Solution
The use of a coupler, phase shifter, attenuator, and combiner to cancel out signal components from one radio unit's transmissions in the signals received by another radio unit, allowing for simultaneous data connectivity and spectrum scanning by separating and attenuating strong signal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wireless network device performs spectrum scanning with one radio unit while providing data connectivity with another radio unit, then the device can determine the least interfered RF channel, but receiver compression occurs due to strong signal components from the transmitting radio unit being received by the scanning radio unit
Solution Approach 1:
The patent extracts and removes the harmful strong signal components from the received signals before they cause receiver compression. The system identifies signal components corresponding to transmissions from the local transmitting radio unit and selectively removes these components from the received signal stream, allowing the spectrum scanning radio unit to accurately detect external signals without being overwhelmed by internal transmissions.
Solution Approach 2:
The patent introduces an intermediary signal processing system that mediates between the transmitting and receiving radio units. This intermediary system includes signal detection mechanisms that identify local transmissions and signal removal mechanisms that eliminate these transmissions from the received signal path, enabling simultaneous transmit and receive operations without interference.
2Measurement precision
If the device temporarily suspends data connectivity to perform spectrum scanning, then accurate channel selection can be achieved, but service continuity is interrupted
Solution Approach 1:
The patent enables continuous operation of both data connectivity and spectrum scanning functions simultaneously. By removing the harmful signal components in real-time, the system maintains uninterrupted data transmission through one radio unit while continuously performing spectrum analysis through another radio unit, eliminating the need to suspend either function.
Solution Approach 2:
The system performs preliminary identification and removal of harmful signal components before they can cause receiver compression or interfere with spectrum scanning. By proactively eliminating these interfering signals in advance, the system ensures both data connectivity and spectrum scanning can proceed without interruption or degradation.
3Adaptability or versatility
If multiple radio units operate simultaneously in the same Wi-Fi band, then device functionality is enhanced, but self-interference prevents successful spectrum scanning
Solution Approach 1:
The patent converts the harmful self-interference caused by simultaneous radio unit operation into a beneficial capability. By detecting and removing the strong signal components from local transmissions, the system transforms what would be a disabling interference into an opportunity to enhance spectrum scanning accuracy. The system uses knowledge of its own transmissions to improve the quality of received signals for spectrum analysis.
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
Enables successful spectrum scanning and data connectivity by preventing receiver compression, allowing wireless network devices to operate effectively on the same RF band without interference.
Implementation Method 1
The use of a coupler, phase shifter, attenuator, and combiner to cancel out signal components from one radio unit's transmissions in the signals received by another radio unit
Data Source
AI summary
Disclosed herein, one embodiment of the disclosure is directed to a system, apparatus, and method for enabling simultaneous transmit and receive in the same Wi-Fi band within a device by first obtaining a first information corresponding to a first set of signals to be transmitted wirelessly by a first antenna of a first device and transmitting, by the first antenna of the first device, the first set of signals. Then, a second set of signals comprising: (a) the first set of signals transmitted by the first antenna of the first device and (b) a third set of signals transmitted by a second device different than the first device are received by a second antenna of the first device. Thereafter, a second information representing the second set of signals received by the second antenna of the first device is obtained. Last, based on the first information and the second information, a third information comprising an estimation of the third set of signals without the first set of signals is determined.