Wireless Synchronization Signals With Lower PSS-SSS Interference
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Solution Overview
Problem
In next-generation radio access networks, the primary synchronization signal (PSS) is interfered with by secondary synchronization signals (SSS) from neighboring cells, leading to detection issues.
Innovation Solution
Generate synchronization signal sequences using m-sequences and Gold sequences with specific generator polynomials and mappings to reduce correlation between PSS and SSS, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the primary synchronization signal and secondary synchronization signal occupy the same OFDM symbol with the same bandwidth, then the synchronization signal can be transmitted efficiently, but the secondary synchronization signal interferes with the primary synchronization signal detection
Solution Approach 1:
The patent divides the synchronization signal transmission into two separate OFDM symbols: the first OFDM symbol carries only the primary synchronization signal, while the second OFDM symbol carries only the secondary synchronization signal. This temporal segmentation eliminates the interference between PSS and SSS that occurs when they occupy the same time resource, while still maintaining efficient synchronization signal transmission overall.
2Reliability
If the primary synchronization signal sequence and secondary synchronization signal sequence are generated using standard m-sequences and Gold sequences, then the synchronization signal can be generated according to 3GPP specifications, but the cross-correlation between PSS and SSS remains high causing detection interference
Solution Approach 1:
The patent modifies the sequence generation parameters by using different generator polynomials for the primary and secondary synchronization signals. Specifically, the primary synchronization signal uses a first generator polynomial while the secondary synchronization signal uses a second generator polynomial that is different from the first. This parameter change reduces the cross-correlation between PSS and SSS sequences, thereby improving detection accuracy while still complying with 3GPP specifications.
Data Source
AI summary
This application discloses a synchronization signal sending method and a related device. The method includes: generating, a first synchronization signal sequence and a second synchronization signal sequence, where the first synchronization signal sequence is a sequence obtained based on a first m-sequence, the second synchronization signal sequence is a sequence obtained based on a Gold sequence, the Gold sequence is generated based on a second m-sequence and a third m-sequence, and a generator polynomial of the first m-sequence is the same as a generator polynomial of the second m-sequence; mapping, the first synchronization signal sequence onto M subcarriers in a first time unit to obtain a first synchronization signal, and mapping the second synchronization signal sequence onto M subcarriers in a second time unit to obtain a second synchronization signal, where M and N are positive integers greater than 1.