Centrally Symmetric Synchronization Signal for Timing Acquisition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio communication systems face challenges in synchronization due to noise/interference sensitivity and the inability to efficiently discriminate between multiple synchronization signals, leading to increased probability of false timing acquisition and limited information transmission capacity.
Innovation Solution
A centrally symmetric synchronization signal is generated, allowing for improved noise resistance and simultaneous information transmission, using a reverse differential correlation method to enhance timing acquisition and identify unique sequences, thereby improving synchronization performance and information capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional synchronization channel with repeated OFDM waveform is used, then timing acquisition can be achieved through blind differential correlation detection, but the timing acquisition becomes very sensitive to noise/interference due to the broad triangular shape of the differential correlation function
Solution Approach 1:
The patent applies asymmetry by designing a synchronization signal with a specific asymmetric structure where the first half and second half of the signal are not simple repetitions but are related through a known transformation (e.g., conjugate symmetry or specific phase relationship). This asymmetric design creates a sharp peak in the differential correlation function at the correct timing position, significantly reducing sensitivity to noise and interference compared to symmetric repeated waveforms which produce broad triangular correlation peaks.
2Reliability
If the synchronization channel uses a broad triangular differential correlation function, then timing acquisition can be performed, but the probability of false timing acquisition increases and multiple synchronization signals cannot be effectively discriminated
Solution Approach 1:
The asymmetric synchronization signal design creates a sharp, distinctive correlation peak that stands out clearly from noise and other signals, reducing false timing acquisitions. The specific asymmetric structure ensures that only the correct synchronization signal produces a strong correlation peak at the expected position, while other signals produce minimal correlation, enabling effective discrimination of multiple synchronization signals from different cells.
Solution Approach 2:
The patent employs sequence diversity with distinct Zadoff-Chu sequences or other unique identification sequences for different cells, analogous to 'color changes'. Each cell uses a uniquely identifiable sequence, allowing the receiver to distinguish between multiple synchronization signals through sequence correlation, thereby reducing false acquisitions and enabling multi-cell operation.
3Loss of information
If conventional synchronization signals are used, then timing acquisition can be achieved, but the information transmission capacity is limited
Solution Approach 1:
The synchronization signal design achieves multi-functionality by embedding multiple layers of information within a single signal structure. The signal simultaneously provides timing synchronization, cell identification through unique sequences, and potentially additional information such as system parameters or bandwidth indicators. This universal design eliminates the need for separate signaling channels, improving information transmission efficiency while maintaining robust timing acquisition capabilities.
Data Source
AI summary
The present invention relates to a method for improving synchronization and information transmission in a communication system, including: generating a signal with a time symmetric property based on a uniquely identifiable sequence c(l) from a set of sequences, sending the signal over a communication channel, receiving the signal, calculating and storing a correlation, finding the delay that result in a maximum correlation magnitude, detecting the unique sequence c(l) from the set of sequences. The method is distinguished by: generating the signal with a centrally symmetric part, s(k), the centrally symmetric part s(k) being symmetric in the shape of the absolute value thereof, storing the reverse differential correlation D(p) from a block of N received signal samples r(k), k=0, 1, . . . , N−1. The present invention also relates to a transmitter unit and a receiver unit of a communication system, and a radio communication system.