DMRS Indication for MU-MIMO Channel Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-user MIMO systems, accurate channel estimation is hindered by interference between multiple data streams, leading to degraded performance in channel detection and system efficiency due to limited information about DMRS configurations for non-interfering data streams.
Innovation Solution
A method where a UE obtains indication information about the number of transmission data streams and DMRS configurations for all scheduled UEs, allowing it to determine its own DMRS configuration and RE positions, thereby estimating interference covariance matrices more accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple data streams are transmitted concurrently in MU-MIMO systems, then system capacity and spectral efficiency are improved, but channel estimation accuracy deteriorates due to interference between data streams
Solution Approach 1:
The patent segments the DMRS resources by providing separate indication information for each UE's DMRS configuration. The base station sends specific indication information to each UE about the DMRS ports, scrambling IDs, and orthogonal cover codes assigned to that UE, allowing each UE to independently identify and process only its designated reference signals, thereby isolating the channel estimation process from interference caused by other UEs' data streams
Solution Approach 2:
The patent applies local quality by enabling each UE to determine its specific DMRS configuration parameters (ports, scrambling IDs, orthogonal cover codes) tailored to its particular interference environment. Each UE receives customized indication information that allows it to optimally estimate its channel by focusing on locally relevant DMRS resources, rather than using a uniform approach for all UEs
2Measurement precision
If indication information for all UEs' DMRS configurations is provided, then interference estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential DMRS configuration parameters needed for channel estimation into compact indication information sent to each UE. Instead of providing complete configuration details for all UEs, the base station sends extracted key parameters (DMRS ports, scrambling IDs, orthogonal cover codes) that enable UEs to independently reconstruct their specific DMRS configurations and perform accurate interference estimation without requiring extensive signaling
Solution Approach 2:
The patent implements partial action by providing indication information that contains only the necessary subset of DMRS configuration parameters required for effective channel estimation. The indication information includes DMRS ports, scrambling IDs, and orthogonal cover codes - sufficient for interference estimation but excluding redundant details, thereby achieving adequate interference cancellation performance with minimized signaling overhead
Data Source
AI summary
Disclosed in the present invention are a demodulation reference signal (DMRS) indication method, a terminal, and a base station. The method in the present invention comprises: a first terminal obtains transmission data flow quantity indication information of all scheduled terminals in at least one scheduling resource, or obtains resource element (RE) quantity indication information occupied by DMRSs corresponding to transmission flows of all the scheduled terminals in the at least one scheduling resource; and the first terminal determines, according to the obtained indication information, RE positions configured or occupied by the DMRSs corresponding to an interference data flow of the first terminal in the scheduling resources. By means of the present invention, DMRSs in transmission of multiple data flows can be indicated, and the present invention is particularly applicable to an MU-MIMO system of a large-scale antenna array.