Sensing Sequence Pairing for Low-Interference ISAC Nodes
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Solution Overview
Problem
There is no complete solution for implementing sequence transmission in Integrated Sensing and Communications (ISAC) systems, which are crucial for 6G technology, to enable coexistence and mutual assistance between wireless communications and radar sensing.
Innovation Solution
A method for sending and receiving sensing sequences between communication nodes, utilizing complementary sequences or identical sequences, and establishing communication links to facilitate integrated waveform design, including the use of Golay and completely complementary sequences, and CAN sequences, with specific resource locations and scrambling techniques to enhance sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing sequences are transmitted using conventional methods in ISAC systems, then communication functionality is maintained, but sensing performance deteriorates due to interference and lack of optimized sequence design
Solution Approach 1:
The patent applies parameter changes by utilizing complementary sequences with specific mathematical properties (where the sum of autocorrelation functions equals zero at non-zero shifts). This changes the fundamental parameter of sequence design from conventional independent sequences to complementary sequence pairs, thereby improving sensing performance while controlling interference through the inherent mathematical properties of complementary sequences
Solution Approach 2:
The patent employs composite materials principle by combining multiple complementary sequences (first, second, third, and fourth sensing sequences) into a composite sensing transmission scheme. These sequences are composite structures with specific correlation properties that when transmitted through different communication links, collectively improve sensing performance while managing interference through their structured composition
2Area of stationary object
If multiple communication nodes transmit sensing sequences simultaneously, then sensing coverage is improved, but interference increases and sensing precision deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the sensing transmission into multiple independent complementary sequence pairs assigned to different communication nodes. Each node transmits its own complementary sequences (first and second sequences for one node, third and fourth sequences for another node) on different resource locations, allowing simultaneous transmission while maintaining individual sequence properties that prevent mutual interference and preserve sensing precision across extended coverage areas
3Measurement precision
If complementary sequences are used for sensing transmission, then sensing performance is improved, but device complexity increases due to sequence management and resource coordination requirements
Solution Approach 1:
The patent applies universality by designing a multi-functional communication system where the same communication infrastructure and protocols are used for both communication and sensing purposes. The complementary sequences serve dual functions: maintaining communication reliability while enabling enhanced sensing performance, thereby reducing overall system complexity despite the sophisticated sequence management required
Data Source
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AI summary
Provided are a sensing sequence sending method, a sensing sequence receiving method, a communication node, and a sensing system. The sensing sequence sending method is applied to a first communication node, and includes: acquiring a first sensing sequence and a first resource location; and sending the first sensing sequence to a second communication node at the first resource location, where the first sensing sequence is identical to a second sensing sequence or the first sensing sequence and a second sensing sequence form a pair of complementary sequences, and the second sensing sequence is a sensing sequence sent to the second communication node by another first communication node at a second resource location.