Wireless Synchronization Signals Using M- and Gold-Sequence Separation
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Solution Overview
Problem
In 5G networks, the primary synchronization signal (PSS) is interfered with by secondary synchronization signals (SSS) from neighboring cells due to their similar bandwidth occupancy, leading to detection challenges.
Innovation Solution
Generate synchronization signal sequences using specific m-sequences and Gold sequences with controlled correlations to reduce interference between PSS and SSS, employing distinct mappings onto subcarriers to minimize cross-correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the primary synchronization signal and secondary synchronization signal occupy the same bandwidth with similar sequences, then the signal structure is simplified and easier to implement, but the detection accuracy deteriorates due to interference from neighboring cells
Solution Approach 1:
The patent applies local quality by making the synchronization signal sequences cell-specific through different initialization values and scrambling codes. Each cell uses locally optimized sequence properties (different root indices, cyclic shifts, or scrambling codes) to ensure that while all cells use the same signal structure (ease of manufacture), the local sequence characteristics minimize interference with neighboring cells (improved detection accuracy).
Solution Approach 2:
The patent changes key parameters of the synchronization sequences including initialization values, root indices, cyclic shift values, and scrambling codes. By adjusting these parameters differently across cells while maintaining the same basic signal structure, the system achieves both structural simplicity and reduced inter-cell interference, thereby improving detection accuracy without complicating the overall signal design.
2Device complexity
If the same m-sequence generator polynomial is used for both primary and secondary synchronization signals, then the generation process is simplified and device complexity is reduced, but the cross-correlation between signals increases causing interference
Solution Approach 1:
The patent segments the synchronization signal generation into distinct components: the primary synchronization signal uses one m-sequence with specific parameters while the secondary synchronization signal uses a different m-sequence or applies different transformations (scrambling, cyclic shifts). This segmentation allows each signal type to have optimized sequence properties that minimize cross-correlation, while the overall generation process remains relatively simple and structured.
Solution Approach 2:
The patent introduces asymmetry in the sequence generation by using different initialization values, root indices, or scrambling approaches for primary versus secondary synchronization signals. Even when using the same basic m-sequence generator polynomial, the asymmetric application of transformation parameters ensures that the two signal types have different statistical properties and lower cross-correlation, reducing interference while maintaining generation simplicity.
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.