UWB Frequency Band Stitching with Adaptive Channel Ordering
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Solution Overview
Problem
UWB devices with low costs and low power consumption are unable to process high-bandwidth signals due to limitations in analog-to-digital converter performance, affecting sensing performance and precision.
Innovation Solution
A method for frequency band stitching in UWB systems that considers the channel use sequence and transmit power backoff to balance sending time and power, using in-sequence and out-of-sequence channel orders based on frequency band overlapping rates, allowing for flexible adjustment according to application scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple frequency bands are stitched to form a wider bandwidth, then sensing precision is improved, but device complexity increases due to the need for channel sequence alignment and power management
Solution Approach 1:
The patent introduces a frequency band overlapping rate parameter to control the degree of frequency overlap between adjacent channels. By adjusting this parameter, the system can achieve different sensing precision levels without always requiring complex channel alignment procedures, thus resolving the contradiction between precision and complexity
Solution Approach 2:
The patent dynamically selects between in-sequence and out-of-sequence channel orders based on the frequency band overlapping rate. This dynamic adaptation allows the system to optimize the balance between sensing precision and channel alignment complexity for different operating conditions
2Device complexity
If in-sequence channel order is used for frequency band stitching, then channel alignment is simplified, but transmit power spectral density accumulates causing reduced sensing range
Solution Approach 1:
The patent uses the frequency band overlapping rate as a control parameter to determine when to switch from in-sequence to out-of-sequence channel order. When overlapping rate exceeds a threshold, the system switches to out-of-sequence ordering to prevent power spectral density accumulation, thus maintaining sensing range while keeping alignment relatively simple
Solution Approach 2:
The patent converts the potential harm of frequency band overlap (which causes power accumulation) into a beneficial control mechanism. By monitoring the overlapping rate and using it to trigger mode switching, the system turns what would be a harmful effect into a useful feedback signal for optimizing performance
3Measurement precision
If out-of-sequence channel order is used to reduce power accumulation, then sensing range is maintained, but sending time increases
Solution Approach 1:
The patent introduces a threshold mechanism for the frequency band overlapping rate that triggers switching between channel ordering modes. This allows the system to use out-of-sequence ordering only when necessary (when overlapping rate is high), thereby minimizing the time penalty while maintaining sensing range, rather than always using the more time-consuming out-of-sequence approach
4Measurement precision
If frequency band overlapping rate is increased to improve sensing precision, then more frequency bands can be stitched, but transmit power spectral density accumulates
Solution Approach 1:
The patent converts the harmful effect of power spectral density accumulation into a useful control signal. The frequency band overlapping rate is monitored and used to trigger mode switching, turning what would be a harmful accumulation effect into a beneficial feedback mechanism that prevents excessive power accumulation while maximizing sensing precision
Solution Approach 2:
The system dynamically adjusts the channel ordering mode based on the frequency band overlapping rate. When the overlapping rate increases and approaches thresholds that would cause harmful power accumulation, the system switches to out-of-sequence channel order to mitigate the power density issue while maintaining the benefit of stitching multiple frequency bands
Data Source
AI summary
A method includes: Two communication parties exchange a control message, for indicating a frequency band overlapping rate between adjacent channels in a channel set used for frequency band stitching; and when the frequency band overlapping rate belongs to an overlapping rate set S1, the channel set is in an in-sequence channel order; or when the frequency band overlapping rate belongs to an overlapping rate set S2, the channel set is in an out-of-sequence channel order. According to this application, a better compromise between sending time and transmit power in a frequency band stitching process can be implemented. This application is applied to a UWB-based WPAN system, a sensing system, or the like, including 802.15 series protocols, for example, 802.15.4ab or a next-generation standard of 802.15.4ab. This application may be further applied to a WLAN system supporting 802.11 series protocols.