Channel Vector Calculation for MIMO Pilot Overhead Reduction
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Solution Overview
Problem
In MIMO systems, especially with the addition of a new network device, obtaining complete channel information between network devices and terminal devices is challenging due to high pilot overheads and delays, particularly in frequency division duplex downlink transmission scenarios with large-dimensional channels.
Innovation Solution
A channel information obtaining method that reduces pilot overheads and delay by using a terminal device to calculate a third channel vector from first and second channel vectors, and then using compressed sensing or artificial intelligence to derive a fourth channel vector, with precoding matrices to compress channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel estimation methods are used in MIMO systems with large-dimensional channels, then complete channel information can be obtained, but pilot overheads and delay increase significantly
Solution Approach 1:
The patent segments the channel estimation process into two stages: first estimating a reduced-dimensional channel matrix through compressed sensing, then refining it through iterative optimization. This segmentation allows obtaining complete channel information while significantly reducing pilot overheads and delay compared to traditional direct estimation methods.
2Measurement precision
If traditional channel estimation methods are used in MIMO systems with large-dimensional channels, then complete channel information can be obtained, but system complexity increases
Solution Approach 1:
The patent changes the parameter dimensionality by transforming the large-dimensional channel estimation problem into a reduced-dimensional estimation problem through compressed sensing. By changing the representation parameters and using iterative optimization, the system achieves complete channel information with reduced computational complexity.
Data Source
AI summary
This application provides channel information obtaining methods and communications apparatuses, to reduce pilot overheads and a delay of obtaining channel information. In an example method, a terminal device receives one or more first reference signals on a dth port of the terminal device, where the first reference signal is a reference signal from a first network device. The terminal device obtains a first channel vector h1,d based on the received first reference signal, where h1,d a channel vector of a channel between the dth port of the terminal device and the first network device. The terminal device receives N second reference signals on the dth port of the terminal device. The terminal device obtains a second channel vector h2,d based on the received second reference signal.