OFDM ZC Signal Root Selection for Lower Ranging Error
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of large ranging errors when performing sensing using orthogonal frequency division multiplexing (OFDM) signals generated based on Zadoff-Chu (ZC) sequences is addressed.
Innovation Solution
The method involves generating a first signal based on a ZC sequence where the root value of the ZC sequence is an element in a specific set, ensuring the multiplicative inverse of any element modulo N is an integer greater than n and less than N-n, and mapping these elements to subcarriers of an OFDM signal, followed by inverse fast Fourier transform and cyclic prefix addition to reduce ranging errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing is performed using an OFDM signal generated based on a ZC sequence, then sensing functions such as positioning, detection, imaging, and identification can be implemented, but a large ranging error occurs
Solution Approach 1:
The patent changes the parameter of the ZC sequence by carefully selecting the root value from a specific set. This parameter change modifies the signal's autocorrelation properties and chirp rate, thereby reducing ranging errors and improving sensing accuracy without changing the fundamental sensing mechanism
Solution Approach 2:
The patent dynamically adjusts the signal characteristics by selecting different root values from the first set based on the specific sensing requirements. This allows the system to optimize the chirp rate and autocorrelation properties adaptively, resolving the contradiction between achieving sensing functionality and maintaining ranging precision
Data Source
AI summary
A signal transmission method and a related apparatus, to resolve a problem of a large ranging error for an OFDM signal generated based on a ZC sequence. The method includes: a first device generates a first signal based on the ZC sequence, where a root value of the ZC sequence is an element in a first set, a value of a multiplicative inverse of any element in the first set modulo N is an integer greater than n and less than N-n, N is an integer greater than n, N is a length of the ZC sequence, and n is an integer greater than 0 and less than N/2. The first device sends the first signal. Correspondingly, the first device or a second device receives an echo signal of the first signal.