ISAC Waveform With Repeated Tails for High-Doppler Sensing
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Solution Overview
Problem
The design of waveforms for integrated sensing and communication (ISAC) is incomplete, leading to inefficiencies in both communication and sensing performance, particularly in high Doppler scenarios.
Innovation Solution
A waveform design that includes a time-domain signal with subsymbols having the same tail signals, allowing for weak interference between signal blocks and subcarriers, enabling improved Doppler estimation and demodulation performance, while maintaining compatibility with existing waveforms like NR OFDM/DFT-s-OFDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional waveform design is used for ISAC, then existing communication standards can be maintained, but sensing performance and communication performance in high Doppler scenarios are insufficient
Solution Approach 1:
The waveform is segmented into multiple subsymbols within each symbol, where each subsymbol contains a data segment and a tail sequence. This segmentation allows the receiver to perform block division and processing at a finer granularity, improving Doppler estimation accuracy and sensing performance in high Doppler scenarios while maintaining compatibility with existing communication standards
Solution Approach 2:
The waveform design incorporates periodic tail sequences at the end of each subsymbol, creating a structured periodic pattern that facilitates correlation-based detection and Doppler estimation. This periodic structure enhances the waveform's ability to handle high Doppler shifts while maintaining orthogonality and reducing interference
2Measurement precision
If waveform design is optimized for sensing performance, then Doppler estimation accuracy improves, but compatibility with existing communication waveforms deteriorates
Solution Approach 1:
The waveform design achieves multi-functionality by incorporating features that serve both communication and sensing purposes. The tail sequences enable Doppler estimation and sensing operations, while the overall structure maintains compatibility with existing communication receivers. The waveform can be processed as conventional OFDM/DFT-s-OFDM for communication while enabling advanced sensing operations through the structured subsymbol and tail sequence design
Solution Approach 2:
The invention changes key waveform parameters including introducing multiple subsymbols per symbol, adding tail sequences with specific lengths, and modifying the time-domain structure. These parameter changes enable improved Doppler estimation accuracy through block division and correlation operations, while the changes are designed to maintain backward compatibility with existing communication standards
3Adaptability or versatility
If subcarrier spacing is increased to handle larger Doppler frequency, then Doppler tolerance improves, but spectral efficiency deteriorates
Solution Approach 1:
Instead of increasing subcarrier spacing, the invention segments each symbol into multiple subsymbols and introduces tail sequences. This allows the receiver to perform block division and correlation-based Doppler estimation, effectively handling large Doppler shifts without changing the subcarrier spacing, thereby maintaining spectral efficiency while improving Doppler tolerance
Data Source
AI summary
This application relates to a communication method, a communication device, and a computer-readable storage medium. In the method, a communication device obtains a set of data streams, where a first data stream in the set includes a set of data segments, and each data segment in the set of data segments includes a data sequence and at least one predetermined sequence. The communication device processes the set of data streams to obtain a time-domain signal including a plurality of subsymbols, where tail signals of the plurality of subsymbols are the same, and the tail signal is associated with the at least one predetermined sequence. Then, the communication device sends the time-domain signal.