MU-MIMO Precoding with Adaptive Transmission Schemes
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Solution Overview
Problem
The spatial degree of freedom in multiple-user multiple-input multiple-output (MU-MIMO) technology is limited due to the use of a single transmission scheme for data transmission between a transmit end device and multiple receive end devices, which affects signal quality and reliability.
Innovation Solution
A data sending and receiving method that employs different transmission schemes, including spatial multiplexing, transmit diversity, and precoder cycling, to improve spatial freedom and adapt to varying channel conditions of terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmission scheme is used for MU-MIMO data transmission, then the system complexity is reduced, but the spatial degree of freedom is limited and signal quality deteriorates
Solution Approach 1:
The patent implements dynamic transmission scheme selection where the transmit end device adapts between different transmission schemes (first and second schemes) based on channel conditions and spatial degree of freedom requirements. This dynamic adaptation allows the system to optimize spatial degree of freedom while managing complexity through conditional logic rather than fixed architecture.
2Ease of operation
If a single transmission scheme is used for all terminal devices, then the ease of operation is improved, but the adaptability to varying channel conditions deteriorates
Solution Approach 1:
The patent changes transmission parameters dynamically by selecting between different transmission schemes based on channel quality indicators. The transmit end device adjusts transmission parameters (such as precoding matrices, resource allocation) according to feedback from terminal devices, enabling adaptation to varying channel conditions while maintaining operational simplicity through automated parameter adjustment.
Solution Approach 2:
The system implements feedback mechanisms where terminal devices report channel quality information to the transmit end device. Based on this feedback, the transmit end device selects appropriate transmission schemes, creating a closed-loop control system that adapts to channel conditions while keeping operation simple through automated decision-making based on feedback signals.
3Reliability
If multiple transmission schemes are employed for different terminal devices, then the spatial degree of freedom and transmission reliability are improved, but the device complexity increases
Solution Approach 1:
The patent segments the terminal devices into different groups based on their channel conditions and spatial requirements. Different transmission schemes are applied to different segments (groups of terminal devices), allowing the system to improve overall transmission reliability by optimizing each segment independently while managing complexity through modular scheme implementation.
Data Source
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AI summary
This application provides a data sending method and apparatus, and a data receiving method and apparatus, so that based on different channel quality, different transmission schemes can be flexibly used to transmit data, to improve data receiving quality and improve a spatial degree of freedom. The method includes: precoding, by a network device, a plurality of spatial flows to obtain a plurality of precoded data flows, where the plurality of spatial flows are homed to at least two transmission schemes, and the at least two transmission schemes include precoder cycling; and sending the plurality of precoded data flows.