Symbol Processing Apparatus Guard Interval Configuration
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Solution Overview
Problem
Conventional communication systems struggle to flexibly configure guard intervals between symbols, leading to inefficient use of cyclic prefix lengths, which results in unnecessary overheads for users with different channel conditions, limiting performance and increasing complexity in multiuser multiplexing.
Innovation Solution
A symbol processing method that allows for flexible configuration of guard intervals by ensuring a common symbol component length between consecutive transmitted symbols, enabling different guard intervals to be set based on user requirements, even when a fixed cyclic prefix length is used, through copy operations and signal processing techniques like cyclic shifts and frequency domain weighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed CP length is configured for all users to maintain stable frame structure, then frame structure stability is improved, but guard interval flexibility deteriorates
Solution Approach 1:
The transmitted symbol is segmented into multiple components: a first symbol component, a second symbol component, and a third symbol component. The first symbol component serves as the guard interval for the current symbol, while the second symbol component serves as the guard interval for the next symbol. This segmentation allows different users to have different effective guard interval lengths from the same fixed CP structure, resolving the contradiction between frame stability and guard interval flexibility.
2Reliability
If a longer CP length is selected to accommodate users with large delay spreading, then performance of users with large delay spreading is improved, but overhead for users with small delay spreading increases
Solution Approach 1:
Different users are assigned different effective guard interval lengths by configuring different relationships between the first, second, and third symbol components. Users with large delay spreading receive longer effective guard intervals (larger first symbol component), while users with small delay spreading receive shorter effective guard intervals (smaller first symbol component). This local customization eliminates the need to use a uniformly long CP for all users, reducing overhead for users with small delay spreading while maintaining reliability for users with large delay spreading.
3Adaptability or versatility
If different CP lengths are configured for different users to match their channel conditions, then guard interval flexibility is improved, but frame structure stability deteriorates
Solution Approach 1:
The fixed CP length structure serves multiple functions simultaneously: it provides the guard interval for the current user (first symbol component), provides the guard interval for the next user (second symbol component), and maintains frame synchronization (third symbol component). This multi-functionality allows different effective guard interval lengths for different users while maintaining a unified fixed CP structure, achieving both adaptability and stability.
Data Source
AI summary
This application provides a symbol processing method and apparatus. The method includes obtaining, based on a plurality of complex-valued symbols, a first set corresponding to a first transmitted symbol and a second set corresponding to a second transmitted symbol, performing a copy operation on the first set and the second set so both the first set and the second set have first complex-valued symbols, and a first subset start location including the first complex-valued symbols in the first set is the same as a second subset start location including the first complex-valued symbols in the second set; and performing signal processing including a cyclic shift or frequency domain weighting on the first set and the second set. The start location and an end location of the first subset respectively correspond to locations preceding and following a first reference point of the first transmitted symbol.