OFDM Synchronization Using Zadoff-Chu Reference Signals
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Solution Overview
Problem
Orthogonal frequency division multiplexing (OFDM) systems face slow synchronization issues, affecting user experience due to high synchronization requirements, which current pseudo-noise sequence methods fail to address effectively.
Innovation Solution
The method involves a communication base station inserting equally spaced frequency domain reference signals, specifically Zadoff-Chu sequences, into frequency domain data, transforming them into time domain signals with inverse Fast Fourier Transform (IFFT), and transmitting these to an intelligent terminal, which uses Fast Fourier Transform (FFT) to separate and synchronize the data, reducing synchronization time and improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pseudo-noise sequence method is used for synchronization in OFDM system, then system performance is improved, but synchronization time is increased
Solution Approach 1:
The patent segments the reference signal into two distinct parts: a first reference signal for capturing synchronization timing and a second reference signal for tracking synchronization. This segmentation allows the system to use different synchronization strategies for different phases, reducing overall synchronization time while maintaining accuracy.
Solution Approach 2:
The patent performs preliminary synchronization using the first reference signal before main data transmission begins. By establishing initial synchronization timing in advance, the system avoids time-consuming synchronization processes during actual data communication, thereby reducing total synchronization time.
2Measurement precision
If traditional reference signal insertion method is used, then synchronization accuracy is maintained, but bandwidth resources are wasted
Solution Approach 1:
The patent merges the first and second reference signals into a single composite reference signal structure. By combining multiple reference signal functions into one unified signal, the system reduces the total number of pilot signals required, thereby saving bandwidth resources while maintaining synchronization accuracy through the multi-component structure.
Solution Approach 2:
The composite reference signal serves multiple functions simultaneously: it provides both capture and tracking capabilities, and enables synchronization across different signal types. This multi-functionality eliminates the need for separate dedicated reference signals for each purpose, optimizing bandwidth utilization.
Data Source
AI summary
The invention discloses a data processing method and an intelligent terminal based on an orthogonal frequency division multiplexing (OFDM) system. The method comprises: a communication base station inserting equally spaced frequency domain reference signals to frequency domain data; obtaining frequency domain signals by equivalently transforming the frequency domain data being inserted with the frequency domain reference signals, wherein the frequency domain signals comprise the frequency domain reference signals superimposed with the frequency domain data; obtaining time domain signals by performing inverse Fast Fourier Transform (IFFT) on the frequency domain signals, wherein the time domain signals comprise time domain reference signals superimposed with the time domain data; and transmitting the time domain signals to the intelligent terminal.