Synchronization Signal Complex Sequence Correlation Peak
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Solution Overview
Problem
Current synchronization methods in communications systems result in prolonged synchronization times due to the poor autocorrelation properties of sequences containing +1 and −1, leading to increased power consumption and burr phenomena in correlation peaks.
Innovation Solution
The implementation of a synchronization signal transmission method that includes a first complex sequence and a second sequence, where the first sequence is sent on a different time unit than the second sequence, allowing for a correlation processing result that is a complex sequence, thereby achieving a sharper correlation peak and reducing synchronization time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a synchronization signal uses sequences containing +1 and -1, then the sequence structure is simple, but the autocorrelation property is poor resulting in burr phenomenon and prolonged synchronization time
Solution Approach 1:
The patent changes the parameter type of the synchronization sequence from real numbers (+1, -1) to complex numbers. This parameter change enables the sequence to have both amplitude and phase information, which significantly improves the autocorrelation property and eliminates the burr phenomenon while maintaining sequence structure simplicity.
Solution Approach 2:
The patent uses composite sequence structures where the synchronization signal is formed by combining multiple complex sequences with different properties. Specifically, it combines a first complex sequence with a second complex sequence that has different root values, creating a composite structure that achieves sharp correlation peaks while maintaining simplicity.
2Reliability
If the terminal device continuously receives synchronization signals to ensure synchronization, then synchronization reliability is maintained, but power consumption increases
Solution Approach 1:
The patent employs preliminary action by designing a synchronization signal with excellent autocorrelation properties that enables the terminal device to achieve quick synchronization in advance. The sharp correlation peak allows the terminal to rapidly determine synchronization status without continuous receiving, thus reducing subsequent power consumption while maintaining reliability.
3Device complexity
If the correlation processing result is a real sequence, then the processing is simple, but the correlation peak is not sharp enough causing long synchronization duration
Solution Approach 1:
The patent changes the parameter domain from real sequences to complex sequences in the correlation processing. This parameter change transforms the correlation result from a real sequence to a complex sequence, which preserves phase information and produces sharp correlation peaks, thereby reducing synchronization duration without significantly increasing processing complexity.
Data Source
AI summary
This application provides a synchronization signal transmission method and a communications apparatus. The synchronization signal transmission method and the communications apparatus are applied to the communications field. In the synchronization signal transmission method, a synchronization signal generated and sent by a network device may include a first sequence and a second sequence. The first sequence is a first complex sequence or a sequence obtained based on the first complex sequence. The second sequence is a sequence obtained based on the first complex sequence, and the second sequence is different from the first sequence. Because a correlation processing result between the first sequence and the second sequence is still a complex sequence, there is a good correlation property, so that a terminal device can obtain a relatively sharp correlation peak when synchronizing with the network device based on the synchronization signal, thereby effectively shortening duration required for synchronization.