Wireless Uplink Channel Estimation for Multi-RRU Indoor Cells
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Solution Overview
Problem
In indoor wireless communication scenarios, merging multiple remote radio units (RRUs) of the same frequency into one cell increases the complexity and computational load of channel estimation, leading to communication delays and reduced quality, especially when RRUs support multi-antenna transmission.
Innovation Solution
A wireless communication method that involves obtaining uplink signals and determining transmission parameters, including demodulation and quality attributes, to identify a target transmission device. This method selects relevant sub-parameters associated with the target device to determine a third transmission parameter, reducing the computational complexity of channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple RRUs are merged into one cell to eliminate interference, then interference between cells is eliminated, but the computational complexity and calculation amount of channel estimation increase
Solution Approach 1:
The patent segments the channel estimation process by identifying and separating the target transmission device from other transmission devices based on quality attributes. This segmentation allows the terminal to perform channel estimation only for the target device, dividing the complex multi-RRU estimation into a manageable single-device estimation task.
Solution Approach 2:
The patent extracts the target transmission device information from the mixed uplink signals received from multiple RRUs. By determining which device is the target based on quality attributes and selecting only the relevant sub-parameters associated with that target device, the system extracts only the necessary information for channel estimation, eliminating the need to process all signals from all RRUs.
2Measurement precision
If multiple RRUs participate in channel estimation, then comprehensive channel information is obtained, but communication delays increase due to heavy calculation
Solution Approach 1:
The patent extracts only the essential sub-parameters related to the target transmission device from the complete set of transmission parameters. This extraction maintains the necessary channel estimation accuracy while significantly reducing the calculation burden and processing time compared to analyzing all parameters from all RRUs.
Solution Approach 2:
Instead of performing complete channel estimation for all transmission devices and all parameters, the patent applies partial action by focusing only on the target transmission device and selecting only the relevant sub-parameters. This partial approach achieves sufficient estimation accuracy for communication purposes while avoiding the excessive calculation that would cause delays.
3Productivity
If RRUs support multi-antenna transmission, then transmission capacity is improved, but computing resources for channel estimation are occupied exponentially
Solution Approach 1:
The patent extracts and identifies the target transmission device among multiple devices transmitting on multiple antennas. By determining the target device based on quality attributes and then selecting only the sub-parameters associated with that specific target device, the system reduces the exponential computational burden to a manageable level while still supporting multi-antenna transmission capabilities.
Solution Approach 2:
The patent segments the multi-antenna channel estimation problem by isolating the target transmission device and its associated parameters from the overall system. This segmentation transforms the exponentially complex multi-device, multi-antenna estimation into a simpler single-device estimation task, maintaining transmission capacity while reducing computational requirements.
Data Source
AI summary
A wireless communication method includes obtaining an uplink signal, obtaining a first transmission parameter and a second transmission parameter of the uplink signal based on the uplink signal and transmission data carried in the uplink signal, determining a target transmission device based on the second transmission parameter, selecting a first transmission sub-parameter associated with the target transmission device in the first transmission parameter, selecting a second transmission sub-parameter associated with the target transmission device in the second transmission parameter, and determining a third transmission parameter of the uplink signal based on the first transmission sub-parameter and the second transmission sub-parameter.