Transmitter Self-Jamming Analog Cancellation via Phase Shifting
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing mutual coupling between antennas during object detection, particularly in RADAR operations, which leads to interference and decreased detection range due to self-jamming and phase noise.
Innovation Solution
The system employs multiple receive antennas with adjustable phase shifters, using a feedback loop to control phase-shift settings based on mutual coupling components and phase noise, combining phase-shifted signals to cancel or reduce mutual coupling effects, thereby enhancing object detection accuracy and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receive antennas are used to improve detection range, then object detection capability is enhanced, but mutual coupling between antennas increases causing self-jamming and phase noise
Solution Approach 1:
The patent captures the mutual coupling signal that would normally be considered harmful interference and uses it as a useful reference signal for cancellation. By treating the coupled signal as a beneficial resource for generating cancellation waves, the system converts the harmful mutual coupling into a useful component for improving detection accuracy
Solution Approach 2:
The system implements a feedback mechanism where the mutual coupling signal is captured, processed through phase shifters, and fed back as a cancellation signal. The control unit continuously adjusts phase-shift settings based on the captured coupling signal to dynamically reduce its harmful effects on object detection
2Measurement precision
If phase shifters are used to reduce mutual coupling effects, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses its own mutual coupling signal to generate the cancellation waveform, eliminating the need for external reference signals or additional complex hardware. The captured coupling signal serves itself as the basis for creating the cancellation effect, reducing overall system complexity
Solution Approach 2:
The phase shifters serve multiple functions: they process the captured mutual coupling signal to generate cancellation waves, and can also be used for beamforming and signal direction control. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity
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 reduces mutual coupling and associated phase noise, improving the detection range and accuracy of objects in wireless communication systems, especially in RADAR applications by destructively combining mutual coupling components.
Implementation Method 1
generating a first phase-shifted signal via a first phase shifter based on the first receive signal, and a second phase-shifted signal via a second phase shifter based on the second receive signal
Implementation Method 2
combining the first phase-shifted receive signal and the second phase-shifted signal to generate a combined receive signal, wherein at least one of generating the first phase-shifted signal or generating the second phase-shifted signal comprises controlling a phase-shift setting based on at least one of a mutual coupling component or a phase noise
Data Source
AI summary
Certain aspects provide a method for object detection. The method generally includes: transmitting, via a first antenna, a transmit signal generated via a first transmit chain, the transmit signal being generated based on a mixer output signal; receiving a first receive signal via a first receive chain coupled to a second antenna, the first receive signal being associated with the transmit signal; generating, via a first phase shifter, a first phase-shifted signal based on an adjustment signal received via a signal path coupled to the first transmit chain, the adjustment signal being generated based on the mixer output signal; combining the first phase-shifted signal and the first receive signal to generated a combined receive signal, wherein a phase-shift setting of the first phase shifter is controlled based on at least one of a mutual coupling component or a phase noise of the combined receive signal.