Orthogonal Sequence Generation for Communication Signal Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems using orthogonal sequences, the reception performance is degraded due to frequency selective fading and/or time synchronization errors, especially when the length of the orthogonal sequence is not aligned with the number of allocated frequency resources.
Innovation Solution
The method involves setting specific parameters for multiplexing information bits, determining the length of orthogonal sequences based on these parameters, and generating orthogonal sequences that are transmitted using radio resources. The sequences are mapped to frequency resources in a specific order to maintain alignment and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the length of the orthogonal sequence is set equal to the number of allocated frequency resources, then the mapping is straightforward and resource utilization is efficient, but reception performance is degraded due to frequency selective fading and time synchronization errors
Solution Approach 1:
The patent divides the orthogonal sequence transmission into multiple segments by setting the orthogonal sequence length shorter than the number of allocated frequency resources. Multiple orthogonal sequences are transmitted across different frequency resources, which segment the impact of frequency selective fading and time synchronization errors, thereby improving reception performance while maintaining resource utilization efficiency.
2Reliability
If the orthogonal sequence length is shortened to avoid frequency selective fading, then reception performance is improved, but the number of frequency resources required increases
Solution Approach 1:
The patent combines multiple short orthogonal sequences across different frequency resources to achieve the same information transmission capacity as a single long orthogonal sequence. By merging the benefits of short sequences (resistance to fading) with efficient frequency resource allocation, the system improves reception performance without excessive resource consumption.
3Device complexity
If orthogonal sequences are mapped to frequency resources without specific alignment, then the implementation is simple, but time synchronization errors occur and reception performance degrades
Solution Approach 1:
The patent establishes predetermined mapping relationships between orthogonal sequences and frequency resources before transmission. This preliminary arrangement ensures that sequences are mapped to specific frequency resources in a controlled manner, preventing time synchronization errors and improving reception performance while maintaining implementation simplicity through predefined rules.
Data Source
AI summary
An operation method of a first communication node in a communication system includes setting a first parameter for multiplexing a plurality of information bits; setting a length of an orthogonal sequence corresponding to each of the plurality of information bits; setting a second parameter representing phase information corresponding to each of the plurality of information bits; generating orthogonal sequences of the plurality of information bits based on the first parameter, the second parameter, and the length of the orthogonal sequence; and transmitting the orthogonal sequences to a second communication node using radio resources.