UWB Channel Stitching Sequence for Power and Sensing Range
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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, and the channel use sequence in frequency band stitching processes is not adequately addressed, affecting sensing performance and range.
Innovation Solution
A method for determining and aligning a channel use sequence in frequency band stitching based on sending time and transmit power backoff, allowing for a compromise between sending time and transmit power, and selecting in-sequence or out-of-sequence channel orders based on frequency band overlapping rates to optimize sensing performance and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple frequency bands are stitched to form a wider bandwidth to improve sensing precision, then sensing performance is improved, but the channel use sequence alignment becomes complex and transmit power must be reduced due to spectral overlap
Solution Approach 1:
The patent applies parameter changes by systematically varying the channel use sequence parameters (overlapping factor b, wrap occurrence timing) to optimize the frequency band stitching process. Different values of b (0, 1, 2, 3) correspond to different overlapping rates (25%, 50%, 75%, 100%), allowing the system to adjust the degree of frequency band overlap and associated time intervals to balance sensing precision with power spectral density constraints
Solution Approach 2:
The patent implements dynamics by making the channel use sequence adaptive rather than fixed. The transmit end determines the channel use sequence dynamically based on the frequency band stitching requirements, and the sequence can be adjusted by changing the overlapping factor b and the timing of wrap occurrences. This dynamic adjustment allows optimization of both sensing performance and power spectral density distribution
2Productivity
If channels are transmitted in in-sequence order to reduce total sending time, then productivity is improved, but power spectral density accumulates and transmit power must be backoff
Solution Approach 1:
The patent applies periodic action by introducing wrap occurrences at regular time intervals (e.g., after 1ms) in the out-of-sequence channel order. This periodic interruption prevents continuous frequency band overlap, allowing the power spectral density to reset and avoiding accumulation. The wrap occurrence creates periodic gaps in the transmission sequence that manage power spectral density while still progressing through the frequency bands
Solution Approach 2:
The patent uses inversion by transmitting channels in out-of-sequence order rather than the natural in-sequence order. Instead of transmitting channels in ascending or descending frequency order, the system transmits them in a scrambled sequence determined by the formula CH((p*b) MOD (N)) + (p*b) DIV (N), which inverts the conventional approach and prevents power spectral density accumulation
3Power
If channels are transmitted in out-of-sequence order to prevent power spectral density accumulation, then transmit power is maintained, but the transmission start time interval increases
Solution Approach 1:
The patent applies parameter changes by adjusting the overlapping factor b to control the degree of frequency band overlap and associated time intervals. By changing b from 0 to 3, the system can select different overlapping rates (25%, 50%, 75%, 100%) and corresponding time intervals, allowing optimization of the trade-off between maintaining transmit power and minimizing transmission time loss
Data Source
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Figure 3b~3c
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AI summary
This application relates to an information exchange method and an apparatus in a UWB system. The 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 such as a next-generation protocol of 802.11ax like 802.11be, or EHT, a next-generation protocol of 802.11be like Wi-Fi 8 or UHR, or Wi-Fi AI.