Self-Interference Cancellation for Concurrent Radar Detection
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Solution Overview
Problem
Current dynamic frequency selection (DFS) technologies in wireless communication networks face challenges in maintaining system throughput and capacity due to the need for transmission gaps to detect radar signals, which reduces efficiency and increases circuit complexity and power consumption.
Innovation Solution
The implementation of self-interference cancellation techniques allows for concurrent transmission and primary user detection by creating virtual transmission gaps, enabling the cancellation of interference from received signals and determining radar usage without complete signal suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission gaps are created to detect radar signals through dynamic frequency selection, then primary user detection capability is improved, but system throughput and capacity are reduced
Solution Approach 1:
The system performs preliminary calibration of the self-interference cancellation circuitry during periods when natural transmission gaps occur or when no primary user detection is needed. This pre-calibration establishes channel characteristics and interference profiles that enable accurate radar detection during concurrent transmission periods, eliminating the need for future transmission suspensions.
Solution Approach 2:
The patent enables continuous transmission by implementing self-interference cancellation that removes the transmitted signal's interference from the received signal in real-time. This allows the receiver to detect radar signals during ongoing transmission without requiring interruption of the useful communication action, maintaining system throughput while enabling primary user detection.
2Productivity
If self-interference cancellation circuitry is implemented to enable concurrent transmission and radar detection, then system throughput is improved, but device complexity and power consumption increase
Solution Approach 1:
The system dynamically adjusts parameters of the self-interference cancellation circuitry based on transmission conditions, signal characteristics, and detection requirements. By changing parameters such as cancellation depth, filtering characteristics, and processing intensity, the system optimizes the balance between throughput enhancement and complexity management, activating full cancellation capability only when necessary.
3Measurement precision
If self-interference cancellation is used to cancel interference from received signals during transmission, then radar detection accuracy is improved, but power consumption increases
Solution Approach 1:
The system applies partial self-interference cancellation by removing only the necessary portion of transmitted signal interference required for adequate radar detection, rather than attempting to cancel all interference completely. This partial action achieves sufficient detection accuracy while consuming less power than full cancellation would require.
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 enhances system throughput by allowing continuous transmission during primary user detection, reducing the need for natural transmission gaps and minimizing the costs associated with self-interference cancellation, while maintaining effective radar detection capabilities.
Implementation Method 1
cancelling, at least partially from the received signal, an interference caused by the transmission on the received signal, wherein the cancelling comprises processing the received signal using a self-interference cancellation circuitry
Data Source
AI summary
Certain aspects of the present disclosure relate to adapting transmitter configuration for efficient concurrent primary user detection through adaptive self-interference cancellation. A wireless transmitting device may schedule a transmission in a shared spectrum. The device may scan at least a portion of the shared spectrum during the transmission to receive a signal. Interference caused by the transmission may he cancelled from the received signal using self-interference cancellation circuitry. The device may determine whether the received signal indicates usage by a primary user of the shared spectrum. In an aspect, the transmission may be a SISO transmission. In another aspect, carrier aggregation may be used for the transmission and a potential carrier may be subject to primary user detection. The device may determine a self-interference cancellation complexity for a combination of carriers including the potential carrier, and may select one or more carriers for aggregation based on the self-interference cancellation complexity.