Precoding method, communication apparatus, and storage medium
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Solution Overview
Problem
In Cell-free MIMO systems, inter-user interference in downlink transmissions is significant due to non-orthogonal user channels, leading to decreased transmission performance.
Innovation Solution
A precoding method involving preprocessing modulation symbols using a determined preprocessing matrix, such as ((HHH)t+σ2I)−1, to suppress inter-user interference, followed by conjugate precoding at access nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional precoding is used in Cell-free MIMO systems, then the system maintains simple deployment and high scalability, but inter-user interference is significant due to non-orthogonal user channels, leading to decreased transmission performance
Solution Approach 1:
The patent applies preliminary action by preprocessing modulation symbols before transmission. Specifically, the system computes a preprocessing matrix based on channel state information and applies it to modulation symbols at the transmitter side. This preliminary processing prepares the signals in advance to counteract expected interference, thereby improving transmission performance while maintaining the simple deployment structure of Cell-free MIMO systems.
2Reliability
If preprocessing matrix computation is performed to suppress inter-user interference, then transmission performance is enhanced, but computational complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the precoding functionality into two separate stages: preprocessing at the transmitter and conventional precoding at the access points. The preprocessing matrix computation is performed centrally based on aggregated channel state information, while individual access points only need to apply their local precoding vectors. This segmentation reduces the computational burden on each individual device while achieving overall interference suppression.
3Productivity
If traditional precoding methods are used, then the system structure remains simple, but spectral efficiency is limited due to significant inter-user interference
Solution Approach 1:
The patent applies parameter changes by modifying the preprocessing matrix based on channel state information. The preprocessing matrix is dynamically adjusted according to the current channel conditions, allowing the system to adaptively suppress inter-user interference. This parameter adaptation enables improved spectral efficiency while maintaining the simplicity of the Cell-free MIMO architecture, as the changes are made in the signal processing domain rather than the physical deployment.
Data Source
AI summary
Embodiments of the present disclosure provide a precoding method, a communication apparatus, and a storage medium. The method includes: acquiring, by an access node, a preprocessed modulation symbol from a control node, where the preprocessed modulation symbol is obtained by preprocessing a modulation symbol by a preprocessing matrix; precoding, by the access node, the preprocessed modulation symbol, to obtain a precoded modulation symbol; and sending, by the access node, the precoded modulation symbol.