Communication Signal CP Length Allocation for Demodulation
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Solution Overview
Problem
Improving demodulation performance in communication systems by reducing inter-symbol interference through optimized cyclic prefix (CP) lengths and subcarrier spacings for reference signals and data symbols.
Innovation Solution
The method involves determining a first subcarrier spacing that is K times the second subcarrier spacing, where K is an integer greater than 1, and ensuring the CP length of the first symbol is greater than or equal to that of the second symbol, thereby reducing inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CP length of data symbols is increased to reduce inter-symbol interference, then demodulation performance is improved, but transmission efficiency decreases due to increased overhead
Solution Approach 1:
The patent applies different CP lengths to different symbol types: reference signal symbols use a first CP length while data symbols use a second CP length. This local differentiation allows the reference signal to have sufficient CP for reliable demodulation while data symbols use shorter CP to maximize transmission efficiency, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent changes the CP length parameter based on the symbol type and subcarrier spacing configuration. By defining multiple CP length parameters (first CP length for reference signals, second CP length for data) and selecting appropriate values from predefined tables, the system optimizes both demodulation performance and transmission efficiency under different operating conditions.
2Adaptability or versatility
If different subcarrier spacings are used for reference signals and data, then flexibility of parameter selection is improved, but system complexity increases
Solution Approach 1:
The patent introduces dynamic subcarrier spacing configuration where reference signal symbols can use a first subcarrier spacing while data symbols use a second subcarrier spacing. This dynamic parameter selection allows the system to adapt to different channel conditions and service requirements, improving flexibility while maintaining manageable complexity through standardized configuration tables.
Solution Approach 2:
The patent segments the transmission resource into different symbol types (reference signal symbols and data symbols) with different subcarrier spacing configurations. This segmentation allows independent optimization of each segment's parameters, providing flexibility in parameter selection while keeping the overall system complexity manageable through modular configuration.
Data Source
AI summary
This application relates to the field of communication technologies, and provides a communication method and apparatus, to improve demodulation performance. A first subcarrier spacing, a second subcarrier spacing, a cyclic prefix (CP) length of a first symbol, and a CP length of a second symbol are determined, where the first subcarrier spacing is K times the second subcarrier spacing, K is an integer greater than 1, and the CP length of the first symbol is greater than or equal to the CP length of the second symbol.