Weil-Derived Spreading Codes for Flexible Length and Low Interference
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Solution Overview
Problem
Existing spread spectrum communications systems lack flexibility in spreading code length and size, which limits the improvement of correlation properties for modulated signals, making them prone to interference and improper reception.
Innovation Solution
The use of Weil sequences to generate adaptable spreading codes, where a set of Weil sequences is adapted to form codes with specific lengths, and selecting codes based on correlation properties to enhance the correlation properties of the modulated signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spreading codes are used, then the system structure is simple, but the correlation properties are insufficient and flexibility is limited
Solution Approach 1:
The patent applies parameter changes by systematically varying the length of Weil sequences and selecting specific subsequences to create spreading codes with different lengths and correlation properties. This allows optimization of correlation properties while maintaining flexibility in code length selection, directly addressing the contradiction between improved reliability and controlled complexity.
Solution Approach 2:
The patent segments Weil sequences into specific length portions to form spreading codes. By dividing the original Weil sequences into manageable segments of predetermined lengths, the system achieves both improved correlation properties through Weil sequence characteristics and controlled complexity through systematic segmentation and selection processes.
2Adaptability or versatility
If spreading codes with fixed lengths are used, then the system is simple to implement, but the adaptability to different signal requirements is limited
Solution Approach 1:
The patent implements dynamics by enabling the system to adaptively select spreading codes of different lengths from a family of codes derived from Weil sequences. This dynamic selection capability allows the system to adjust code length and correlation properties according to specific signal requirements, achieving high adaptability while the systematic generation process keeps implementation complexity manageable.
Solution Approach 2:
The patent achieves universality by creating a family of spreading codes from a single Weil sequence source that can serve multiple functions and applications. The same generation methodology produces codes of various lengths suitable for different signal types and requirements, providing flexibility and adaptability without requiring separate code families for each application.
3Object-affected harmful factors
If conventional spreading codes are used, then the implementation is straightforward, but the interference resistance is insufficient
Solution Approach 1:
The patent applies copying by generating multiple spreading codes from a single Weil sequence template through systematic variation and subsequence extraction. This copying approach maintains the beneficial correlation properties and interference resistance of Weil sequences while producing a family of codes that can be implemented straightforwardly, balancing improved interference resistance with ease of generation.
Data Source
AI summary
Methods and systems relating to Weil-based spreading codes are described herein. In an embodiment, a method includes generating a set of Weil sequences, adapting a plurality of sequences of the set of Weil sequences to form a first plurality of codes, and selecting a second plurality of codes from the first plurality of codes. A code of the first plurality of codes is selected based at least on a correlation associated with the code. Each code of the first plurality of codes has a predetermined length.