OFDM Reference Signal Staggering Offset for Ambiguity Resolution
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Solution Overview
Problem
Conventional OFDM systems face ambiguity issues in delay and Doppler frequency domains during joint communication and sensing, affecting sensing performance due to varying reference signal patterns.
Innovation Solution
A method for determining a staggering offset format for OFDM reference signal symbols, eliminating time delay ambiguity in a two-dimensional range, utilizing comb structure patterns and different staggering schemes to enhance ambiguity performance in OFDM communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional reference signal patterns are used in OFDM systems, then the system maintains standard compatibility and simplicity, but ambiguity performance in sensing algorithms deteriorates due to varying delay and Doppler frequency characteristics
Solution Approach 1:
The patent applies parameter changes by modifying the reference signal pattern parameters (staggering offset format, comb structure configuration) to optimize ambiguity performance. Specifically, it changes the time-domain and frequency-domain parameters of the reference signal to extend the unambiguous range in delay and Doppler frequency domains, directly addressing the contradiction between measurement precision and device complexity.
2Measurement precision
If reference signal patterns are optimized for sensing performance, then ambiguity performance improves, but sensing dynamic range is reduced due to side peak power increases
Solution Approach 1:
The patent applies local quality by optimizing specific portions of the reference signal pattern (different comb structures, staggering offsets) to achieve local improvements in ambiguity performance while controlling side peak power. The different staggering schemes are designed to address specific local issues in the delay-Doppler domain without compromising overall sensing dynamic range.
3Measurement precision
If the unambiguous range in delay and Doppler frequency domains is extended, then sensing accuracy improves, but the system complexity increases due to multiple staggering schemes
Solution Approach 1:
The patent applies segmentation by dividing the reference signal into different comb structures with specific staggering patterns. This segmentation allows the system to extend the unambiguous range in both delay and Doppler frequency domains by using multiple segmented reference signal patterns, each contributing to different aspects of the ambiguity function.
Data Source
AI summary
A joint communication and sensing method for an orthogonal frequency domain multiplexing (OFDM) communication system, includes determining a staggering offset format for an OFDM reference signal (RS) symbol; and eliminating a time delay ambiguity in a two-dimension (2D) range with the determined staggering offset format; wherein the OFDM RS symbol is of a comb structure.