Pilot Resource Configuration for MU-MIMO Channel Estimation
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Solution Overview
Problem
In Multiple User Multiple Input Multiple Output (MU-MIMO) transmission modes, channel estimation performance decreases due to the use of channel estimation based on the number of transmission layers only, leading to data demodulation errors.
Innovation Solution
The allocation of pilot resources to user equipment (UE) based on a preset agreement, including multiple resource elements and orthogonal code division multiplexing, with pilot-resource information being sent to the UE to identify the number of transmission layers, pilot resource usage status, and orthogonal cover code length, enabling correct channel estimation and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If channel estimation is performed based on the number of transmission layers only in MU-MIMO mode, then the implementation is simple, but the channel estimation performance decreases leading to data demodulation errors
Solution Approach 1:
The patent changes the parameters used for channel estimation from merely the number of transmission layers to a comprehensive set including pilot resource information numbers, orthogonal cover code lengths, and pilot resource positions. This parameter expansion enables accurate channel estimation in MU-MIMO mode by providing sufficient information to distinguish between multiple users' channels.
Solution Approach 2:
The patent introduces pilot resource information numbers as an intermediary element that carries essential channel identification information. These numbers serve as mediators between the transmitted pilot signals and the channel estimation process, enabling the receiver to correctly interpret pilot resources and perform accurate channel estimation without directly exposing the complex underlying mechanisms.
2Measurement precision
If dedicated pilot symbols are used with TDM/FDM multiplexing, then channel estimation can be performed per transmission layer, but additional signalling overhead is required to notify the UE of pilot resource allocation
Solution Approach 1:
The patent makes the pilot resource information number serve multiple functions: it identifies the pilot resource allocation, indicates the orthogonal cover code length, and provides information about pilot resource positions. This multi-functionality reduces the need for separate signalling messages for each parameter, thereby reducing overall signalling overhead while maintaining accurate channel estimation.
3Device complexity
If pilot resources are allocated without considering orthogonal code division multiplexing, then resource allocation is simple, but channel estimation performance deteriorates due to interference from multiple users
Solution Approach 1:
The patent segments the pilot resources by introducing orthogonal code division multiplexing with different orthogonal cover codes of varying lengths. This segmentation separates the channels of different users in the code domain, allowing simultaneous transmission of multiple users' pilot signals without mutual interference, thereby eliminating the harmful inter-user interference effect.
Data Source
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AI summary
The present invention discloses a method and an apparatus for processing data sending and a method and an apparatus for processing data receiving, wherein, the method for processing data sending includes: allocating the number of spatial transmission layers and a pilot resource for transmission at each spatial transmission layer; generating pilot resource information according to the number of spatial transmission layers and the pilot resource for transmission at each spatial transmission layer; and sending the pilot resource information to user equipment (UE). According to the embodiments of the present invention, the UE is enabled to determine a specific pilot resource to be used so as to effectively distinguish between user channels, obtain a correct channel estimation value, improve channel estimation performance, and thus, obtain correct service data.