SC-FDM Time-Domain Multiplexing for Reference Signal Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing the overhead associated with demodulation reference signals in SC-FDM waveforms, which affects throughput and channel estimation performance.
Innovation Solution
The method involves multiplexing reference symbols and data-conveying modulation symbols in the time domain to create an SC-FDM symbol, allowing for reduced overhead while preserving the SC-FDM waveform, by using a specific structure for the symbols and cyclic prefixes/postfixes to maintain channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted separately in dedicated SC-FDM symbols, then channel estimation accuracy is maintained, but overhead increases and throughput decreases
Solution Approach 1:
The patent merges reference signals and data signals into the same SC-FDM symbol by multiplexing them in the time domain. Specifically, reference symbols are placed in certain time positions while data symbols are placed in other time positions within the same symbol structure, allowing both channel estimation and data transmission to occur simultaneously without requiring separate dedicated reference signal symbols, thereby reducing overhead and improving throughput while maintaining estimation accuracy
2Productivity
If reference signal overhead is reduced by using fewer dedicated reference symbols, then throughput increases, but channel estimation performance deteriorates
Solution Approach 1:
The patent transitions from frequency-domain multiplexing to time-domain multiplexing of reference and data signals. By arranging reference symbols and data symbols at different time positions within the same SC-FDM symbol, the system achieves efficient resource utilization where reference signals provide necessary channel estimation information while data symbols maximize throughput, resolving the trade-off through temporal separation rather than frequency or resource block separation
3Measurement precision
If more resources are allocated to reference signals, then channel estimation accuracy improves, but system capacity and throughput are reduced
Solution Approach 1:
The patent implements a dynamic symbol structure where the positions and numbers of reference symbols can be flexibly configured based on channel conditions and service requirements. The SC-FDM symbol structure allows adaptive allocation of time resources between reference symbols and data symbols, enabling the system to optimize the balance between channel estimation accuracy and system capacity dynamically rather than using fixed resource allocation
Data Source
AI summary
Certain aspects of the present disclosure allow reference and data-conveying modulations symbols to be multiplexed in the time domain to form an SC-FDM waveform.