Headerless UWB Ranging Packets for Low-Power Distance Assessment
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Solution Overview
Problem
Existing communication technologies using ultra-wideband (UWB) radio technology face challenges in energy efficiency due to the high RF-on time required for synchronization headers, leading to increased power consumption and packet error rates in dense environments.
Innovation Solution
The use of headerless, scrambled timestamp sequence (STS) packets for determining distance between communication circuits, which reduces power consumption by eliminating synchronization headers and allowing for parallel packet transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization headers (SYNC and SFD) are included in UWB packets, then packet isolation and synchronization are improved, but RF-on time and power consumption increase
Solution Approach 1:
The patent extracts and removes the synchronization header (SYNC and SFD fields) from the UWB packet structure, retaining only the essential STS data. This extraction eliminates the source of power consumption while preserving the core ranging functionality through the use of pseudo-random noise sequences for packet identification.
Solution Approach 2:
The patent changes the packet structure parameters by eliminating the fixed-length synchronization header and using variable-length STS sequences. The STS sequences are designed with specific autocorrelation properties that enable synchronization without traditional headers, fundamentally changing how packet identification is achieved.
2Reliability
If synchronization headers are used for packet identification, then packet isolation is improved, but airtime and energy consumption increase
Solution Approach 1:
The patent removes the synchronization header components (SYNC and SFD) that consume airtime, replacing them with a streamlined packet structure that relies on STS sequences for identification. This extraction reduces the minimum packet length from 16 symbols to potentially fewer symbols, directly reducing airtime.
Solution Approach 2:
The patent employs periodic pseudo-random noise sequences with specific autocorrelation properties that enable rapid packet identification. The periodic nature of these sequences allows receivers to quickly detect packet starts without requiring extended synchronization headers, thereby reducing airtime while maintaining packet isolation.
3Reliability
If traditional UWB packet structure with headers is used, then synchronization is achieved, but power consumption and packet error rates increase in dense environments
Solution Approach 1:
The patent changes the fundamental parameters of packet structure by using STS sequences with optimized autocorrelation properties. These sequences provide better resistance to multipath interference and packet errors in dense environments, while the reduced packet length minimizes exposure to interference, further lowering error rates.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces power consumption by halving airtime and RF-on time, increases link budget, and improves packet error rates in dense environments, facilitating more efficient communication technologies.
Implementation Method 1
Many communication technologies utilize ultra wideband (UWB) radio technology having a wide signal bandwidth, for instance greater than 500 MHz or greater than 20% of the carrier frequency of transmitted signals
Implementation Method 2
A time of flight (TOF) value indicative of time elapsed between transmission and reception of the plurality of headerless packets is assessed based on the STS packets
Data Source
AI summary
Aspects of the present disclosure are directed to communicating data for authentication and location determination, such as for authenticating a key FOB and locating the key FOB within a defined distance. As may be implemented in accordance with one or more embodiments, a plurality of headerless packets, respectively including scrambled timestamp sequence (STS) packets but not including encoding and/or synchronization headers, are communicated between respective communication circuits. A time of flight (TOF) value indicative of time elapsed between transmission and reception of the plurality of headerless packets is assessed based on the STS packets. A distance between the communication circuits is determined based on the assessed time of flight.