Pseudo-random OFDM Subcarrier Allocation for Radar Detection
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Solution Overview
Problem
In multi-user scenarios, the simplest subcarrier continuous allocation solution in integrated communication radar systems results in poor detection performance due to high signal correlation among users.
Innovation Solution
A pseudo-random subcarrier allocation method for multi-user OFDM is introduced, where subcarriers are randomly allocated to users using a pseudo-random sequence generated by a quadratic polynomial permutation (QPP) interleaver, reducing signal correlation and improving detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If subcarrier continuous allocation solution is adopted, then device complexity is reduced, but detection performance deteriorates due to high signal correlation among users
Solution Approach 1:
The patent changes the allocation pattern parameter from continuous to pseudo-random, using QPP interleaver to generate different allocation patterns that reduce signal correlation while maintaining system complexity at acceptable levels
Solution Approach 2:
The patent uses pseudo-random sequences as copies of allocation patterns, where each user receives a copied but distinct pattern from the base sequence, reducing correlation without requiring completely new allocation schemes
2Reliability
If pseudo-random subcarrier allocation is implemented, then detection performance is improved by reducing signal correlation, but device complexity increases
Solution Approach 1:
The patent modifies the allocation parameter from simple continuous indexing to pseudo-random sequences generated by QPP interleaver, improving detection performance while controlling complexity through standardized mathematical operations
Solution Approach 2:
The patent replaces complex manual or heuristic allocation mechanisms with automated pseudo-random sequence generation based on quadratic polynomial permutation, reducing operational complexity while improving performance
3Ease of operation
If subcarrier continuous allocation is used, then ease of operation is improved, but signal correlation increases leading to poor detection performance
Solution Approach 1:
The patent transforms the allocation parameter from simple sequential indexing to pseudo-random sequences, maintaining ease of operation through automated generation while significantly reducing signal correlation
Solution Approach 2:
The pseudo-random sequence generation is self-configuring based on user identifiers and system parameters, automatically reducing correlation without requiring manual intervention to optimize allocation patterns
Data Source
AI summary
A method, apparatus and computer readable medium for a multi-user orthogonal frequency division multiplexing (OFDM) subcarrier allocation that improves detection performance of the integrated communication radar system. The performance of the integrated communication radar system is improved by: determining a pseudo-random subcarrier allocation manner for multi-user OFDM.