Random Access Signal Detection via Frequency Domain Interference Cancellation
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Solution Overview
Problem
Existing methods for detecting random access signals in LTE systems suffer from high leak detection and false detection indices in interference environments, requiring high system complexity and resource-intensive serial interference cancellation processes.
Innovation Solution
A method and apparatus that determine a temporary peak detection sequence from a time domain random access signal, compute an interference cancellation weight for a frequency domain cyclic shift sequence, and perform interference cancellation to obtain a final peak detection sequence, improving detection accuracy and reducing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If serial interference cancellation is used to detect random access signal, then detection accuracy is improved, but system complexity and resource consumption increase significantly
Solution Approach 1:
The patent applies preliminary action by performing interference cancellation in the frequency domain before peak detection. The method pre-processes the received signal by transforming it to frequency domain, canceling interference components based on estimated channel states, and then transforming back to time domain for detection. This preliminary interference removal improves detection accuracy while avoiding the complex iterative reconstruction required in traditional time-domain serial interference cancellation methods.
2Measurement precision
If serial interference cancellation is used to detect random access signal, then detection accuracy is improved, but resource consumption increases
Solution Approach 1:
The patent substitutes the mechanical time-domain serial interference cancellation process with a frequency-domain based approach. By transforming the signal processing from time domain to frequency domain, the method replaces iterative time-domain reconstruction operations with more efficient frequency-domain computations, reducing computational complexity and resource consumption while maintaining interference cancellation effectiveness.
3Device complexity
If frequency domain detection is used, then computational complexity is reduced, but interference cancellation effectiveness decreases
Solution Approach 1:
The patent applies parameter changes by transitioning the detection parameter domain from time domain to frequency domain. This parameter change enables the use of frequency-domain signal processing techniques that reduce computational complexity while maintaining interference cancellation effectiveness. The method computes interference cancellation weights in frequency domain based on channel state information, achieving both computational efficiency and reliable interference suppression.
Data Source
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AI summary
The present invention provides a method for detecting a random access signal. The method includes: determining a temporary peak detection sequence according to a received time domain random access signal; determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, obtaining a final peak detection sequence; and performing peak detection on the final peak detection sequence. The present invention discloses an apparatus and system for detecting a random access signal at the same time.