CP-OFDM Sub-Symbol Reference Signaling for Symbol Alignment
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Solution Overview
Problem
Existing communication technologies face challenges in reducing signaling overheads while ensuring alignment between CP-OFDM symbols among users, leading to potential channel demodulation failures due to misalignment and loss of frequency orthogonality.
Innovation Solution
Splitting a main symbol into multiple sub-symbols, with some dedicated for reference signals and others for data transmission, to reduce overheads while maintaining alignment and frequency orthogonality among users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the subcarrier width of the CP-OFDM symbol is increased to reduce signaling overheads, then signaling overheads are reduced, but alignment between CP-OFDM symbols among users deteriorates, causing frequency orthogonality loss and channel demodulation failures
Solution Approach 1:
The main symbol is segmented into multiple sub-symbols in the time domain. Specifically, the main symbol used for sending reference signals is divided into multiple sub-symbols, where some sub-symbols are used for reference signals and others for data transmission. This segmentation allows the system to reduce the effective subcarrier width for reference signals (maintaining alignment) while still achieving overhead reduction through selective usage of sub-symbols.
2Manufacturing precision
If a complete CP-OFDM symbol is used for reference signal transmission to ensure alignment, then alignment and frequency orthogonality are maintained, but signaling overheads increase
Solution Approach 1:
The reference signal transmission is extracted from the complete CP-OFDM symbol structure. Instead of requiring a full CP-OFDM symbol for reference signals, the invention extracts only the necessary sub-symbols within the main symbol that are needed for reference signal transmission. This extraction reduces the overhead while maintaining the alignment properties of the original CP-OFDM symbol structure.
3Productivity
If the subcarrier width is increased to fit more users, then user capacity increases, but misalignment among a large quantity of CP-OFDM symbols occurs, causing frequency orthogonality loss
Solution Approach 1:
Different subcarrier widths are applied to different parts of the signal structure. Specifically, the reference signal sub-symbols use a narrower subcarrier width to maintain alignment and frequency orthogonality, while other parts of the system can use wider subcarrier widths to support more users. This local differentiation of quality parameters allows the system to simultaneously achieve high user capacity and maintain reliability through frequency orthogonality where needed.
Data Source
AI summary
This application provides a communication method, a communication apparatus, and a computer-readable storage medium. The method includes: determining a position of a main symbol occupied by a reference signal when a single subcarrier width is used, where the main symbol includes N sub-symbols including a sub-symbol used for sending a reference signal and a sub-symbol used for sending data, N>1, and N is an integer; and sending or receiving a reference signal by using the sub-symbol used for sending a reference signal, and sending or receiving data by using the sub-symbol used for sending data.