Channel Measurement Feedback for MU-MIMO Precoding
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Solution Overview
Problem
In multi-user multiple-input multiple-output (MU-MIMO) systems, existing methods for determining precoding matrices based on downlink channels do not adequately consider interference between multiple terminal devices, limiting system capacity and throughput.
Innovation Solution
A channel measurement method that involves generating and sending channel information indicating receive beam vectors and weighting coefficients from terminal devices to network devices, allowing comprehensive consideration of interference and enabling precise precoding for each terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the network device considers channel directions of multiple terminal devices to be equally important using traditional precoding, then the precoding implementation is simple, but multi-user interference cannot be effectively cancelled and system capacity is limited
Solution Approach 1:
The patent changes the parameter representation from traditional equal-weight precoding to weighted receive beam vectors with different weighting coefficients. Each terminal device's channel direction is assigned a specific weight based on its importance, allowing the network device to differentiate between multiple users and effectively cancel multi-user interference while maintaining manageable complexity
Solution Approach 2:
The patent segments the channel information into multiple receive beam vectors with distinct weighting coefficients for different terminal devices. This segmentation allows the network device to process each user's channel direction separately with appropriate weighting, enabling targeted interference cancellation for each user group
2Device complexity
If traditional precoding methods are used without considering individual terminal device channels, then the processing complexity is low, but interference cancellation performance is poor
Solution Approach 1:
The patent introduces weighting coefficients as new parameters to modify the traditional precoding approach. By changing from uniform weighting to differentiated weighting based on individual terminal device channels, the system achieves better interference cancellation performance while keeping the processing complexity manageable through efficient matrix operations
3Productivity
If the network device obtains comprehensive channel information for precise precoding, then multi-user interference is minimized and throughput is maximized, but the channel information processing complexity increases
Solution Approach 1:
The patent extracts the essential channel characteristics into receive beam vectors and their corresponding weighting coefficients. By taking out only the most relevant channel information needed for precoding rather than processing complete channel matrices, the system reduces processing complexity while maintaining the ability to minimize interference and maximize throughput
Data Source
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AI summary
This application provides a channel measurement method and a communication apparatus. The method includes: generating channel information, where the channel information indicates one or more receive beam vectors and one or more weighting coefficients, each of the one or more weighting coefficients corresponds to one receive beam vector, the one or more receive beam vectors and the one or more weighting coefficients corresponding to the one or more receive beam vectors are used to determine a channel of at least one frequency domain unit between a terminal device and a network device, the one or more receive beam vectors are selected from a receive beam vector set, and the receive beam vector set is determined based on a predefined base vector set; and sending the channel information. Therefore, the terminal device may feed back information on a receive side to the network device, so that the network device determines precoding based on channel information fed back by each terminal device, to approach an upper bound of a system capacity.