CSI Feedback via Orthogonal Beam Projection
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Solution Overview
Problem
The existing wireless communication systems face challenges in efficiently transmitting and receiving channel state information (CSI) due to increased signaling overhead, particularly in next-generation mobile communication systems that require high data traffic, increased transfer rates, and low latency, where explicit CSI feedback is necessary but often results in significant signaling overhead.
Innovation Solution
A method is introduced where a terminal in a wireless communication system receives a CSI-reference signal, generates a first matrix for the channel, and projects it onto an orthogonal beam matrix to reduce dimensionality, transmitting the resulting second matrix as CSI, which includes a plurality of orthogonal beams orthogonal to each other, thereby reducing the signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit channel state information feedback is transmitted, then channel estimation precision is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential channel state information by projecting the channel covariance matrix onto a reduced-dimensional orthogonal beam matrix. Instead of transmitting the complete high-dimensional channel matrix, only the transformed low-dimensional representation is fed back, thereby reducing signaling overhead while preserving the most important channel characteristics for accurate estimation.
Solution Approach 2:
The patent changes the dimensional parameter of the channel state information from high-dimensional (full channel matrix) to low-dimensional (projected matrix with fewer elements). By transforming the channel covariance matrix through projection onto orthogonal beams, the number of feedback parameters is reduced while maintaining the essential channel state information needed for accurate channel estimation at the base station.
2Measurement precision
If channel covariance matrix is transmitted, then channel state information accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential information from the channel covariance matrix by projecting it onto a reduced-dimensional space spanned by orthogonal beams. This extraction process removes redundant information while retaining the critical channel state characteristics, thereby reducing the computational complexity of processing and transmitting the channel information without sacrificing accuracy.
Solution Approach 2:
The patent transforms the channel covariance matrix from its original high-dimensional form into a lower-dimensional representation through projection onto orthogonal beam vectors. This dimensionality reduction changes the structure of the data from a large matrix to a more compact form, reducing processing complexity while preserving the essential channel state information in a transformed dimensional space.
Data Source
AI summary
In an aspect of the present invention, a method for transmitting channel state information (CSI) of terminal in a wireless communication system may include: receiving a CSI-reference signal (RS); generating a first matrix for a channel based on the CSI-RS; generating a second matrix having a lower dimension than the first matrix by calculating the first matrix and an orthogonal beam matrix having a lower dimension than the first matrix; and transmitting to a base station information on the second matrix and/or the orthogonal beam matrix as the CSI, in which the orthogonal beam matrix may be a matrix including a plurality of orthogonal beams orthogonal to each other as elements.