UWB PPDU Synchronization Sequences for Multi-Device Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing UWB-based communication systems face interference issues due to strong interference generated when multiple devices use the same synchronization sequences, leading to transmission failures.
Innovation Solution
Implement a UWB-based PPDU transmission method using perfect sequences with zero periodic autocorrelation side lobe amplitude and a maximum of three different values in the periodic cross-correlation function, ensuring reduced interference and supporting multi-device concurrent transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple devices use the same synchronization sequence, then time synchronization is achieved, but strong interference is generated leading to transmission failure
Solution Approach 1:
The patent divides the synchronization sequence into two distinct parts: a common synchronization sequence shared by all devices for time synchronization, and a device-specific sequence assigned to each device for reducing interference. This segmentation allows multiple devices to synchronize reliably while minimizing mutual interference through the unique device-specific sequences.
Solution Approach 2:
The patent applies local quality by making the device-specific sequence unique to each device while keeping the common synchronization sequence identical for all devices. This ensures that each device has a distinct local characteristic (device-specific sequence) that prevents interference, while maintaining the global synchronization function through the shared sequence.
2Device complexity
If existing synchronization sequences are used, then sequence design is simple, but strong interference is generated when multiple devices transmit simultaneously
Solution Approach 1:
The patent segments the sequence design into a common part (synchronization sequence) and a device-specific part. This segmentation maintains relative simplicity in the common sequence design while introducing device-specific variations that reduce interference, achieving a balance between design simplicity and interference reduction.
Solution Approach 2:
The patent changes the sequence parameters by introducing a device-specific sequence component that varies across devices. This parameter change transforms the uniform sequence into a differentiated sequence structure that reduces interference while maintaining synchronization functionality.
3Reliability
If perfect sequences with zero periodic autocorrelation side lobe amplitude are used, then transmission reliability is improved, but sequence design complexity increases
Solution Approach 1:
The patent segments the sequence into common and device-specific components, where the device-specific sequence is designed to have perfect autocorrelation properties (zero side lobe amplitude). This segmentation allows the system to achieve high transmission reliability through the perfect sequence properties while managing design complexity by only requiring perfect sequence properties for the device-specific portion rather than the entire sequence.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
This application relates to a UWB-based PPDU transmission method and an apparatus. The method includes: Two communication parties exchange a PPDU. The PPDU includes a first sequence. The first sequence is a ternary perfect sequence, and a periodic cross-correlation function of the first sequence and a second sequence belonging to a same sequence pair has a maximum of three different values. According to embodiments of this application, interference between devices can be reduced. This application is applied to a UWB-based WPAN system, a sensing system, or the like, including 802.15 series protocols, for example, the 802.15.4ab standard 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 Wi-Fi protocol of 802.11ax like 802.11be, Wi-Fi 7, or EHT, a next-generation protocol of 802.11be like Wi-Fi 8 or UHR, or Wi-Fi AI.