Carrier Frequency Offset Estimation via Fingerprint Sequence
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Solution Overview
Problem
Conventional wireless ranging systems for localization and direction-finding are inefficient due to high power consumption and complexity in measuring carrier frequency offset (CFO) between local oscillators in communicating devices, leading to inaccurate distance and direction measurements.
Innovation Solution
A method and system that embeds a flexibly-defined CFO fingerprint sequence within protocol packets, using a predetermined bit sequence with a prefix, signature segments, and a suffix to accurately measure CFO, reducing the need for multiple packet exchanges and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wireless ranging systems exchange hundreds of protocol packets to measure carrier frequency offset, then measurement accuracy is improved, but power consumption increases and measurement time increases
Solution Approach 1:
The patent extracts only the essential information needed for CFO measurement by embedding a predetermined fingerprint sequence in the packet payload, rather than exchanging hundreds of full protocol packets. This extraction approach maintains measurement accuracy while dramatically reducing power consumption by limiting communication to just a few carefully designed packets.
Solution Approach 2:
The patent applies preliminary action by pre-defining the fingerprint sequence structure (including prefix, signature segments, and suffix) before actual CFO measurement begins. Both devices are configured with knowledge of this sequence pattern in advance, enabling direct correlation and accurate CFO estimation from minimal packet exchanges without requiring extensive preliminary communication.
2Measurement precision
If conventional wireless ranging systems exchange hundreds of protocol packets to measure carrier frequency offset, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent extracts only the essential information needed for CFO measurement by embedding a predetermined fingerprint sequence in the packet payload, rather than exchanging hundreds of full protocol packets. This extraction approach maintains measurement accuracy while dramatically reducing measurement time by limiting communication to just a few carefully designed packets.
Solution Approach 2:
The patent applies skipping by directly correlating the received fingerprint sequence with the locally stored template to compute CFO, bypassing the time-consuming conventional approach of exchanging and processing hundreds of packets. This rushing through the measurement process using a optimized direct correlation method achieves accurate CFO estimation in minimal time.
3Measurement precision
If conventional wireless ranging systems use multiple packet exchanges to measure carrier frequency offset, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for CFO measurement by embedding a predetermined fingerprint sequence in the packet payload, simplifying the communication protocol while maintaining measurement accuracy. This reduces system complexity by eliminating the need for complex multi-packet exchange sequences and associated protocol management.
Solution Approach 2:
The patent applies parameter changes by modifying the packet structure to include a specific fingerprint sequence with defined parameters (prefix length, signature segment length, suffix length) rather than using conventional protocol packets. This parameterization approach simplifies the system by providing a standardized, configurable measurement mechanism that reduces protocol complexity while maintaining measurement flexibility and accuracy.
Data Source
AI summary
A wireless communication system (100) estimates a carrier frequency offset between wireless devices (101, 102) by configuring the devices through exchanging packet configuration packets (121, 125) to specify a carrier frequency offset fingerprint (CFOF) sequence in a measurement packet (133, 136) which is transmitted between the wireless devices, where the CFOF sequence in the measurement packet includes a prefix component (31), one or more signature segments (32), and a suffix component (33) for performing CFO measurements at the wireless devices which each process IQ samples corresponding to the signature segments in the received measurement packet by correlating the IQ samples against a reference vector to generate, for each of the one or more signature segments, a carrier frequency offset estimate between the first and second wireless devices.