Symbol Processing Method Flexible Guard Interval Configuration
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Solution Overview
Problem
Conventional communication technologies face challenges in flexibly configuring guard intervals between symbols, leading to unnecessary bandwidth overheads and transmission rate losses, especially for low-delay users in diverse channel conditions.
Innovation Solution
A symbol processing method that allows for flexible configuration of guard intervals between symbols by adjusting the start time of receive windows and utilizing shared symbol components, independent of cyclic prefix lengths, to effectively mitigate multipath effects without relying on fixed cyclic prefix lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic prefix length greater than the maximum multipath delay of a large-delay user is selected as a uniform length, then the reception performance of transmitted symbols is ensured, but unnecessary bandwidth overheads or transmission rate loss occurs for low-delay users
Solution Approach 1:
The patent segments the guard interval configuration by user type, dividing users into large-delay users and low-delay users. Different users receive different guard interval configurations tailored to their specific channel conditions, rather than applying a uniform guard interval length to all users. This segmentation allows each user group to receive only the necessary guard interval length required for their channel characteristics.
Solution Approach 2:
The patent applies local quality by configuring guard intervals with different lengths according to different user requirements. Large-delay users receive longer guard intervals to handle their extended multipath delays, while low-delay users receive shorter guard intervals to minimize bandwidth overhead. This localized optimization ensures that each user receives the appropriate level of protection without unnecessary overhead.
2Reliability
If a uniform cyclic prefix length is configured for all users to handle diverse channel conditions, then reception performance is maintained, but flexibility in configuring guard intervals based on user requirements is lost
Solution Approach 1:
The patent introduces dynamic guard interval configuration where the guard interval length is not fixed but adapts based on user-specific channel conditions. The system dynamically assigns different guard interval lengths to different users according to their channel characteristics, enabling flexible adaptation to diverse channel conditions while maintaining reception performance.
Solution Approach 2:
The patent changes the parameter of guard interval length from a fixed uniform value to a variable parameter that can be adjusted according to user requirements. By making the guard interval length a configurable parameter rather than a fixed constant, the system achieves both reliable reception performance and flexible adaptation to different channel conditions.
3Object-affected harmful factors
If a longer cyclic prefix is used to overcome multipath interference, then interference from multipath effects is reduced, but bandwidth overhead increases
Solution Approach 1:
The patent applies partial action by providing just enough guard interval length to handle the multipath interference for each user group, rather than using an excessively long guard interval for all users. Low-delay users receive shorter guard intervals that are sufficient for their channel conditions, avoiding the excessive bandwidth overhead that would result from using a uniformly long guard interval designed for large-delay users.
Data Source
AI summary
This application provides example symbol processing methods and apparatuses. One example method includes generating a first symbol in a symbol sequence, where the first symbol and a second symbol have a same first symbol component, a start location of the first symbol component in the first symbol is a start location of the first symbol, a start location of the first symbol component in the second symbol is a location at which a cyclic prefix is truncated in the second symbol, the second symbol is a next symbol adjacent to the first symbol, and the first symbol and the second symbol each has a cyclic prefix. The first symbol can then be sent.