UWB PRF Selection to Reduce GNSS Receiver Interference
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Solution Overview
Problem
UWB communication systems interfere with GNSS receivers, degrading their performance in devices capable of simultaneous UWB and GNSS-based positioning.
Innovation Solution
A wireless device dynamically selects a pulse repetition frequency (PRF) for UWB communication that avoids integer multiples of the GNSS signal frequency to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UWB communication is enabled in devices capable of simultaneous UWB and GNSS-based positioning, then wireless communication functionality is improved, but interference with GNSS receivers occurs degrading positioning performance
Solution Approach 1:
The UWB communication system dynamically adjusts its pulse repetition frequency (PRF) based on detected GNSS signal characteristics. The system continuously monitors for GNSS signals and modifies the PRF to avoid integer multiples of the detected GNSS frequency, enabling adaptive coexistence between UWB and GNSS functionalities without sacrificing either communication capability or positioning reliability
Solution Approach 2:
The invention changes the PRF parameter of the UWB signal to specific values that are not integer multiples of the GNSS signal frequency. By selecting PRF values from a set of predetermined frequencies that avoid interference with common GNSS frequencies (such as 1.575 GHz for GPS L1), the system maintains UWB communication effectiveness while preventing degradation of GNSS receiver performance
2Device complexity
If fixed PRF is used for UWB communication, then system complexity is reduced, but interference with GNSS signals cannot be avoided
Solution Approach 1:
Rather than using a completely dynamic and complex PRF adjustment mechanism, the invention employs a semi-static approach where the PRF is selected from a predetermined set of discrete frequency values. This reduces the complexity of the control system while still enabling effective avoidance of GNSS interference through dynamic selection among the predefined options
Solution Approach 2:
The system pre-determines a set of acceptable PRF values that are known to avoid interference with common GNSS frequencies. By establishing this lookup table of safe frequencies in advance, the system eliminates the need for complex real-time calculations while maintaining the ability to avoid harmful interference through simple selection from the pre-approved frequency set
Data Source
AI summary
Aspects presented herein may enable a UE to avoid its UWB communication(s) to interfere with GNSS receiver(s). In one aspect, a UE detects a set of satellite signals for at least one satellite communication channel. The UE identifies a frequency for the detected set of satellite signals in the at least one satellite communication channel. The UE selects a pulse repetition frequency (PRF) for an ultrawide band (UWB) communication of the UE, where the selected PRF is not an integer multiple of the identified frequency for the detected set of satellite signals in the at least one satellite communication channel. In some examples, the UE may also perform the UWB communication based on the selected PRF and receive the detected set of satellite signals, where the performance of the UWB communication and the reception of the detected set of satellite signals are simultaneous.