Mobile-Signal Integrated Sensing and Communication with OFDM Synchronization
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Solution Overview
Problem
The existing OFDM integrated sensing and communication systems based on a fixed frame structure suffer from limitations such as poor flexibility, interference, and limited ranging and speed measurement accuracy due to fixed subcarrier and symbol counts, which hinder their application in complex environments and large-scale node interconnection.
Innovation Solution
An integrated sensing and communication system utilizing a mobile communication signal with a synchronization sequence embedding module and enhanced ranging and speed measurement algorithms, compensating for errors using autocorrelation characteristics of primary and secondary synchronization sequences, and dynamically adjusting subcarrier intervals based on 5G NR standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OFDM integrated system based on fixed frame structure is used, then dual functions of sensing and communication can be realized, but flexibility is poor and interference is easy to occur
Solution Approach 1:
The patent applies dynamics by making the frame structure adjustable rather than fixed. The system dynamically configures the number of CP-OFDM symbols and subcarriers based on sensing requirements, allowing the frame structure to adapt to different scenarios. This resolves the contradiction by enabling both flexibility (through dynamic adjustment) and reliability (through optimized configurations that reduce interference).
Solution Approach 2:
The patent changes key parameters including the number of CP-OFDM symbols per subframe, subcarrier intervals, and cyclic prefix lengths. By adjusting these parameters dynamically, the system achieves flexibility in adapting to different sensing scenarios while maintaining reliability through optimized parameter selections that minimize interference and improve performance.
2Measurement precision
If two-dimensional range-Doppler radar processing algorithm is used, then signal processing flow is simplified, but ranging accuracy is limited by number of subcarriers and speed measurement accuracy is limited by number of symbols
Solution Approach 1:
The patent segments the sensing process into multiple stages: initial coarse ranging using traditional range-Doppler algorithm, followed by fine ranging using synchronization sequence autocorrelation. This segmentation allows the system to achieve high ranging accuracy without requiring the entire system to be complex, as only the fine ranging stage needs advanced processing.
Solution Approach 2:
The patent embeds synchronization sequences with known autocorrelation properties into the CP-OFDM signal in advance. This preliminary action enables the receiver to perform accurate ranging by simply correlating with the known sequence, avoiding the need for complex post-processing algorithms while achieving high measurement precision.
3Adaptability or versatility
If number of subcarriers and number of OFDM symbols are fixed values, then system structure is simple, but application and popularization is restricted
Solution Approach 1:
The patent implements dynamic configurability of the number of CP-OFDM symbols and subcarriers based on sensing requirements. The system can adapt to different scenarios by adjusting these parameters, expanding application scope while managing complexity through standardized adjustment mechanisms rather than arbitrary configurations.
Solution Approach 2:
The patent designs a universal frame structure that can serve multiple functions: communication, sensing, and fine ranging. By making the frame structure adaptable through parameter configuration rather than creating separate systems, the patent achieves multi-functionality that expands application scope without proportionally increasing system complexity.
4Loss of information
If traditional radar system is used, then single node sensing is achieved, but communication data is limited and information interaction between multiple nodes is insufficient
Solution Approach 1:
The patent merges communication and sensing functions into a unified system using the same CP-OFDM signal. The communication data and sensing information are extracted from the same signal transmission, enabling rich information interaction between nodes while maintaining high sensing performance. This eliminates the need for separate radar and communication systems.
Solution Approach 2:
The patent creates a multi-functional system where the CP-OFDM signal simultaneously serves communication and sensing purposes. The same signal carries both data communication information and sensing reflection information, enabling comprehensive information interaction between multiple nodes while maintaining high productivity in both communication and sensing tasks.
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
The system improves sensing accuracy and flexibility, reduces system complexity, and enhances environmental adaptability, making it suitable for multi-node interconnection and complex environments, while minimizing measurement errors.
Implementation Method 1
utilizing autocorrelation characteristics of primary and secondary synchronization sequences
Implementation Method 2
the integrated sensing and communication system based on a mobile communication signal... embeds a same primary synchronization sequence into a second CP-OFDM symbol and an eighth CP-OFDM symbol of one subframe... a receiving sequence output by a parallel-to-serial conversion module at the receiving end is input into a two-dimensional range-Doppler radar processing algorithm module
Data Source
AI summary
The invention relates to an integrated sensing and communication system based on a mobile communication signal, belonging to the field of wireless communication. In this system, a synchronization sequence embedding module is added at a sending end of a node, which is configured for embedding a primary synchronization sequence and a secondary synchronization sequence into a radio frequency signal to be sent and then outputting the radio frequency signal to a digital modulation module; a primary synchronization sequence-assisted ranging accuracy improvement algorithm module and a secondary synchronization sequence-assisted speed measurement accuracy improvement algorithm module is newly added at a receiving end of a node; a target node range and a target node speed output by a two-dimensional range-Doppler radar processing algorithm module are compensated by using the autocorrelation characteristics of the primary/secondary synchronization sequences in a synchronization broadcast block to obtain more accurate target node range and target node speed. The invention effectively improves the sensing accuracy of the existing OFDM integrated system based on fixed frame structure, improves the accuracy of identifying the target node's motion information, and maximizes the sensing ability through flexible deployment of subcarriers to improve the node's own environmental adaptability.