UWB Positioning Accuracy via Channel Impulse Response Correlation
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Solution Overview
Problem
In UWB communication, the inclusion of a secure field in UWB packets complicates the packet structure and, due to EIRP restrictions, requires transmission as short as possible, which can degrade communication accuracy.
Innovation Solution
An electronic device generates channel impulse responses for both synchronization and secure fields of UWB packets, synthesizing data from these fields to improve positioning accuracy by correlating the responses and measuring distance based on the synthetic data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secure field is included in the UWB packet to strengthen security and improve performance, then security and performance are improved, but the packet structure becomes complicated and transmission length must be minimized due to EIRP restrictions, which degrades communication accuracy
Solution Approach 1:
The patent divides the channel impulse response measurement into two separate measurements: one for the SYNC field and another for the secure field (STS). This segmentation allows each field to be processed independently, maintaining security requirements while enabling accurate distance measurement through subsequent correlation of the two measurements.
Solution Approach 2:
The patent transitions from a single-dimensional packet structure analysis to a multi-dimensional approach by measuring channel impulse responses in separate dimensions (SYNC field dimension and secure field dimension) and then combining them through correlation. This dimensional separation resolves the contradiction between maintaining security field integrity and achieving accurate communication.
2Use of energy by moving object
If the UWB packet is transmitted as short as possible due to EIRP restrictions, then power consumption is reduced and transmission efficiency is improved, but the accuracy of UWB communication is degraded
Solution Approach 1:
The patent performs preliminary measurements of channel impulse responses for both the SYNC field and secure field separately before combining them. This preliminary action allows the system to accumulate sufficient measurement data even with short packet transmissions, thereby maintaining communication accuracy while adhering to EIRP restrictions and minimizing power consumption.
Solution Approach 2:
The patent creates multiple copies of channel impulse response measurements by separately measuring the SYNC field and secure field, then combines these copies through correlation. This copying approach enables accurate distance measurement without requiring extended packet transmission, thus reducing power consumption while maintaining accuracy.
3Productivity
If the packet structure is simplified to improve transmission efficiency, then transmission speed is improved, but security performance is compromised when a secure field is required
Solution Approach 1:
The patent makes the channel impulse response measurement process universal by developing a method that works effectively with both the SYNC field and the secure field (STS). The measurement approach is designed to handle the complexities introduced by the secure field while maintaining transmission efficiency, thus achieving multi-functionality that satisfies both security and productivity requirements.
Data Source
AI summary
An electronic device is provided. The electronic device includes an antenna and an ultra wide band (UWB) communication circuit connected with the antenna. The UWB communication circuit is configured to filter a positioning signal received from the antenna into a specified band to be converted into a digital signal, generate a UWB packet including a first field associated with synchronization and a second field associated with security, obtain a first channel impulse response corresponding to the first field and a second channel impulse response corresponding to the second field, when the UWB packet is valid based on the second field, obtain a third channel impulse response, when there is a correlation between the first channel impulse response and the second channel impulse response, and measure a distance to the external electronic device based on the third channel impulse response.