DMRS Grouping for Interference Reduction in LTE-A
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Solution Overview
Problem
In LTE-A systems, large-scale antenna systems face interference issues when sending Demodulation Reference Signals (DMRS) in a non-orthogonal manner, leading to reduced accuracy in channel estimation due to increased interference between DMRSs, especially when handling more than eight data streams.
Innovation Solution
A method is introduced where DMRSs are grouped into multiple groups and mapped to specific resource element positions, with port-related information sent to the terminal device, allowing for reduced interference and improved channel estimation accuracy without increasing time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the base station sends DMRSs in a non-orthogonal manner to support more than eight data streams, then the time-frequency resources occupied by DMRSs are reduced, but the interference between DMRSs increases and channel estimation accuracy deteriorates
Solution Approach 1:
The patent divides the DMRSs into multiple groups (first group and second group) based on their mapping to different sets of resource elements. This segmentation allows the system to handle more data streams by organizing DMRSs in a structured manner, reducing mutual interference through group-based orthogonal or near-orthogonal design while maintaining non-orthogonal multiplexing across groups.
2Productivity
If the base station sends DMRSs in a non-orthogonal manner to support more than eight data streams, then the spectral efficiency is improved, but the interference between DMRSs increases
Solution Approach 1:
The patent extends the DMRS resource allocation into multiple dimensions: different groups of DMRSs are mapped to different sets of resource elements (time-frequency resources), and within each group, orthogonal cover codes are applied. This multi-dimensional approach allows non-orthogonal multiplexing of more than eight data streams while controlling interference through structured resource allocation and coding.
3Measurement precision
If orthogonal cover code for DMRS code division multiplexing of every four data streams is set to 4, then eight data streams can be supported with orthogonal DMRS, but the time-frequency resources occupied by DMRSs increase
Solution Approach 1:
The patent combines orthogonal resource element allocation with orthogonal cover coding within groups. By merging these two orthogonalization techniques, the system can support more than eight data streams with controlled interference while optimizing the usage of time-frequency resources. The combination allows for more flexible resource allocation compared to using orthogonal cover code alone.
Data Source
AI summary
The present disclosure provides a data processing method, apparatus, and system. The method includes: receiving N data streams sent by a network-side device, and determining a demodulation reference signal DMRS corresponding to each of the N data streams. The method also includes grouping DMRSs corresponding to the N data streams into M groups; mapping each group of DMRSs in the M groups to corresponding resource element (RE) positions, and acquiring port-related information corresponding to each group of DMRSs. The method further includes sending the port-related information corresponding to each group of DMRSs to a terminal device; adding each group of DMRSs in the M groups to data streams; and sending the data streams to which the DMRSs are added to the terminal device.