MIMO Weight Matrix Estimation for Low-Overhead Signal Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multiple-input multiple-output (MIMO) systems, delivering precoding and detection matrices between network and terminal devices causes high signaling overheads, especially at subband or resource block levels, leading to reduced received signal-to-noise indicators due to interference elimination and power loss.
Innovation Solution
The terminal device determines its own weight matrix based on a reference signal, allowing it to perform signal detection or precoding without additional signaling from the network device, using DMRS or CSI-RS to carry weight matrix information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device delivers precoding matrix information to the terminal device to eliminate interference between uplink data streams, then the uplink data transmission quality is improved, but the signaling overhead increases significantly
Solution Approach 1:
The terminal device autonomously determines the precoding matrix by processing reference signals and channel state information itself, without requiring the network device to deliver precoding matrix information through signaling. This self-service approach eliminates the signaling overhead while maintaining the interference elimination capability through local computation of precoding parameters
2Reliability
If the network device delivers detection matrix information to the terminal device to enable symbol-level precoding and improve received signal to noise indicator, then the downlink data transmission quality is improved, but the signaling overhead increases significantly
Solution Approach 1:
The terminal device autonomously determines the detection matrix by processing received reference signals and channel state information through local computation, without requiring the network device to deliver detection matrix information through signaling. This enables symbol-level precoding and improves received signal to noise indicator while eliminating the associated signaling overhead
3Manufacturing precision
If the precoding matrix is determined at subband or resource block level to achieve fine-grained interference elimination, then the transmission quality is improved, but the signaling overhead increases due to frequent updates
Solution Approach 1:
The terminal device performs autonomous determination of precoding matrices at subband or resource block levels by locally processing reference signals and channel state information, eliminating the need for network device signaling. This enables fine-grained interference elimination precision without the signaling overhead that would result from frequent updates
Solution Approach 2:
The terminal device pre-computes precoding matrices based on previously received reference signals and channel state information, preparing the necessary precoding parameters in advance before data transmission. This preliminary action enables fine-grained interference elimination while avoiding the need for real-time signaling updates
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Embodiments of this application relate to the field of communication technologies, and disclose a communication method and apparatus, to reduce signaling overheads in a data transmission process between a network device and a terminal device. The method includes: The terminal device receives a reference signal sent by the network device, where the reference signal has an association relationship with a weight matrix U and a channel between the network device and the terminal device, a quantity of rows or columns of the weight matrix U is N, and N is a positive integer less than or equal to a quantity of receive ports of the terminal device; and then the terminal device determines an estimation result of the weight matrix U based on the reference signal, where the estimation result of the weight matrix U is used by the terminal device to perform signal detection on a data signal received by the terminal device from the network device; or the estimation result of the weight matrix U is used by the terminal device to precode a data signal sent by the terminal device to the network device.