Synchronization Timing and Frequency Offset Detection Using Single Training Sequence
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving efficient synchronization timing and frequency offset detection, particularly in wide frequency bandwidths, leading to increased computational complexity, delay, and reduced accuracy.
Innovation Solution
A method and receiver system that utilize a single training sequence for simultaneous phase compensation, generating phase information and a templet signal through auto-correlation and matched filtering, allowing for synchronized timing and frequency offset determination without additional delay or frequency response distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If band split in time domain is used for synchronization timing and frequency offset detection, then detection capability is improved, but computational complexity and delay time increase
Solution Approach 1:
The patent combines synchronization timing detection and frequency offset detection into a single unified process using a single training sequence. The receiver performs both detections simultaneously by generating a template signal from the training sequence and correlating it with the received signal, eliminating the need for separate processing stages and reducing computational complexity while maintaining detection accuracy.
Solution Approach 2:
The training sequence serves multiple functions simultaneously: it is used for both synchronization timing detection and frequency offset detection. The template signal generated from the training sequence is used in a single correlation operation that extracts both synchronization information and frequency offset information, making the system more efficient and reducing the overall computational burden.
2Measurement precision
If band split in time domain is used for synchronization timing and frequency offset detection, then detection capability is improved, but delay time increases
Solution Approach 1:
The patent merges synchronization timing detection and frequency offset detection into a single simultaneous operation. By using one training sequence and performing correlation with a generated template signal, both parameters are detected at the same time, eliminating the sequential processing delay that would occur with separate detection methods.
Solution Approach 2:
The template signal is pre-generated from the known training sequence before correlation with the received signal. This preliminary preparation of the template signal allows for efficient simultaneous detection of both synchronization timing and frequency offset without requiring additional processing time during the actual detection phase.
3Measurement precision
If multiple training sequences are used for synchronization and frequency offset detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the single training sequence universal by designing it to carry both synchronization timing information and frequency offset information. The template signal generated from this training sequence is used for both detection purposes simultaneously, eliminating the need for multiple separate training sequences and the complexity associated with processing multiple sequences.
Solution Approach 2:
The patent combines the functionality of multiple training sequences into a single training sequence. By using correlation with a template signal derived from the training sequence, the system extracts both synchronization timing and frequency offset information from the same signal, reducing system complexity while maintaining detection accuracy.
Data Source
AI summary
The present disclosure includes a method of performing synchronization and frequency offset estimation The method includes an input signal corresponding to a single received training sequence. Phase information and a phase index are generated by performing an auto-correlation function (ACF) on the input signal. A templet signal associated with a sample index of the input signal is generated based on at least one pre-stored look-up table (LUT), the phase index, a frequency bandwidth of the input signal, and the sample index. Power associated with the sample index is calculated by performing a matched filtering on the input signal based on the templet signal. A synchronization timing and a frequency offset for the input signal are simultaneously determined based on a result of the matched filtering.