Transmission Device Spreading Code Inversion for Synchronization
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Solution Overview
Problem
In navigation systems using long spreading codes, the time required for synchronization in reception devices is prolonged, which is problematic.
Innovation Solution
A transmission device that inverts part of the original code using an inversion pattern, generating a spreading code with increased randomness to prevent an increase in spreading code length, while maintaining confidentiality and improving synchronization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long spreading code length is used to improve confidentiality and spreading gain, then the spreading rate and confidentiality are improved, but the time required for synchronization process is prolonged
Solution Approach 1:
The long spreading code is divided into multiple blocks, each block containing a synchronization sequence. This segmentation allows the receiver to perform synchronization on individual blocks rather than processing the entire long code, significantly reducing synchronization time while maintaining the confidentiality benefits of the long code structure
Solution Approach 2:
Synchronization sequences are embedded within the code blocks in advance. This preliminary placement of synchronization markers enables the receiver to quickly locate and synchronize with the transmitted signal without having to process the entire long code sequence, thus reducing synchronization time while preserving the long code's security properties
Data Source
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AI summary
A transmission device (100) includes: an information bit generation unit (101) that generates an information bit sequence; an original code generation unit (102) that generates an original code; an inversion pattern generation unit (103) that generates an inversion pattern indicating positions where bits of the original code are inverted; an inversion pattern control unit (104) that controls the positions; a spreading unit (107) that generates a spread data sequence using the inversion pattern, the information bit sequence, and the original code; and a modulation unit (108) that modulates the spread data sequence and transmits the spread data sequence after modulation.