Reference Signal Continuity Across OFDM Symbol Boundaries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems, the discontinuous nature of conventional reference signals at the boundary between OFDM symbols limits the degree of freedom for the UE to analyze the signal, leading to reduced information acquisition and degraded performance due to limited snapshot vectors and potential subcarrier orthogonality issues.
Innovation Solution
A method where the base station determines a sequence for the reference signal to ensure continuity across symbol boundaries, allowing the UE to perform an inverse Fourier transform and transmit the signal through multiple symbols, enabling the UE to acquire sufficient snapshot vectors by shifting the FFT window within continuous symbol periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional discontinuous reference signal is used at OFDM symbol boundaries, then the signal structure follows standard OFDM characteristics, but the UE cannot acquire sufficient snapshot vectors and analysis performance degrades
Solution Approach 1:
The patent applies continuity by designing the reference signal to maintain continuous phase across OFDM symbol boundaries. Specifically, the phase of the reference signal at the boundary between adjacent symbols is made continuous, allowing the UE to acquire sufficient snapshot vectors by shifting the FFT window across multiple symbols without performance degradation.
Solution Approach 2:
The patent changes the phase parameter of the reference signal at symbol boundaries. By controlling the phase relationship between adjacent symbols and applying appropriate phase rotation, the signal maintains continuity while enabling the UE to perform high-resolution analysis with sufficient snapshot vectors.
2Loss of information
If the FFT window is shifted to acquire more snapshot vectors, then more information can be acquired, but subcarrier orthogonality may not be guaranteed when the window deviates from symbol boundaries
Solution Approach 1:
The continuous phase design allows the FFT window to be shifted across symbol boundaries while maintaining signal integrity. The continuity ensures that even when the window deviates from exact symbol boundaries, the subcarrier orthogonality is preserved and the UE can reliably acquire information.
3Quantity of substance
If the reference signal is transmitted through multiple continuous symbols, then the UE can acquire sufficient snapshot vectors, but the signal must maintain continuity across symbol boundaries which requires specific sequence design
Solution Approach 1:
The patent manages complexity by systematically controlling the phase parameter of the reference signal sequence. By defining specific phase relationships and rotation patterns between adjacent symbols, the patent enables continuous transmission across multiple symbols while maintaining manageable sequence design complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents degradation in analysis performance even when the FFT window deviates from symbol boundaries, allowing the UE to acquire a sufficient number of snapshot vectors and perform high-resolution algorithms effectively.
Implementation Method 1
performing an inverse Fourier transform (IFT) based on the determined sequence of the reference signal
Implementation Method 2
acquire a plurality of snapshot vectors by shifting a fast Fourier transform (FFT) window within the plurality of continuous symbol periods
Data Source
AI summary
A reference signal transmission method performed by at least one base station, the method including: determining a sequence of a reference signal; performing an inverse Fourier transform (IFT) based on the determined sequence of the reference signal; and transmitting a reference signal generated by performing the IFT through a plurality of continuous symbols. The sequence of the reference signal is determined to satisfy a condition that each of at least one subcarrier signal included in the reference signal continues in a boundary between adjacent two symbols.