Data-Modulated DMRS for Wireless Throughput
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Solution Overview
Problem
In wireless communication systems, the transmission of demodulation reference signals (DMRSs) increases overhead and reduces throughput, particularly in high-speed or high Doppler scenarios, as they occupy additional resources that could be used for data transmission.
Innovation Solution
Implementing data-modulated DMRSs, where each resource in the communication carries both a portion of the DMRS sequence and data, allowing for efficient multiplexing and reducing the need for excessive DMRS resources, thereby conserving communication resources and increasing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DMRS transmission is used, then channel estimation is improved, but overhead increases and throughput decreases
Solution Approach 1:
The patent combines DMRS and data transmission into the same time-frequency resources by modulating the DMRS with data. Each DMRS resource element carries both reference signal information for channel estimation and data bits, effectively merging two functions into a single transmission mechanism. This resolves the contradiction by eliminating the need for separate dedicated DMRS resources while maintaining channel estimation capability.
Solution Approach 2:
The DMRS resources are given dual functionality: they serve both as reference signals for channel estimation and as data carriers. By applying data modulation to the DMRS sequence, the same resource elements perform multiple functions simultaneously, reducing overall overhead while preserving the measurement precision required for channel estimation.
2Measurement precision
If additional DMRS resources are transmitted, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
Instead of adding separate DMRS resources, the patent merges data transmission into existing DMRS resources through modulation. This approach maintains or improves channel estimation accuracy using the same quantity of resources, thereby reducing resource overhead rather than increasing it.
Solution Approach 2:
The patent changes the modulation parameter of DMRS from traditional non-modulated reference signals to data-modulated signals. By applying modulation schemes to the DMRS sequence, the system extracts more information from each resource element, improving efficiency without requiring additional resources for channel estimation.
3Measurement precision
If DMRS are transmitted on multiple symbols, then channel estimation is improved, but spectral efficiency decreases
Solution Approach 1:
The patent applies multi-functionality to DMRS transmitted on multiple symbols, allowing each symbol's DMRS to carry both channel estimation information and data. This maintains the benefits of multi-symbol transmission for channel estimation while improving spectral efficiency by utilizing the same resources for data transmission.
Solution Approach 2:
Data is merged with DMRS on multiple symbols through modulation, transforming what would be purely overhead resources into dual-purpose carriers. This merging approach maintains the channel estimation benefits of multi-symbol transmission while recovering spectral efficiency that would otherwise be lost to overhead.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of a capability of the UE to communicate one or more of uplink communications or downlink communications that include data-modulated demodulation reference signals (DMRSs) in which each of one or more resources of a plurality of resources of the uplink communications or the downlink communications carry both at least a portion of a DMRS sequence and data. The UE may transmit an uplink communication or receive a downlink communication that includes the data-modulated DMRSs. Numerous other aspects are provided.