RIS Pilot Resource Mapping for Accurate Channel Estimation
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Solution Overview
Problem
The precision and accuracy of channel estimation in wireless communication systems using Reconfigurable Intelligent Surfaces (RIS) are affected by the positioning of pilot signals in the time domain resource, necessitating a method to establish a precise mapping relationship between pilot signals and time domain resources.
Innovation Solution
A method for determining and sending a mapping relationship between active RIS array elements and time-frequency resources, allowing pilot signals to be accurately mapped to corresponding time-frequency resources, ensuring stable pilot signal transmission and accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot signals are transmitted without a defined mapping relationship to time-frequency resources, then the transmission process is simple, but the precision and accuracy of channel estimation deteriorates
Solution Approach 1:
The patent segments the RIS array into multiple active array elements, each assigned to specific time-frequency resources. This segmentation allows the UE to estimate channels for individual elements by receiving pilot signals mapped to distinct resources, thereby improving channel estimation precision through element-level granularity while managing complexity through structured assignment rules.
Solution Approach 2:
The patent establishes a predefined mapping relationship between active RIS array elements and time-frequency resources before pilot signal transmission. This preliminary action ensures that the UE knows in advance which resources to monitor for pilot signals from specific elements, improving estimation accuracy without requiring complex real-time signaling during the actual pilot transmission phase.
2Measurement precision
If pilot signals are mapped to arbitrary time-frequency resources, then resource allocation is flexible, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent applies local quality by assigning specific time-frequency resources to specific active RIS array elements based on their spatial positions. Each element's pilot signals are mapped to resources that reflect its local characteristics, enabling the UE to perform accurate channel estimation for each element's specific spatial location while maintaining overall system adaptability through configurable mapping rules.
3Measurement precision
If multiple active RIS array elements transmit pilot signals simultaneously on the same resource, then resource utilization is efficient, but signal interference increases reducing estimation precision
Solution Approach 1:
The patent segments the time-frequency resources among multiple active RIS array elements, assigning each element to specific resources rather than allowing simultaneous transmission on the same resource. This segmentation eliminates pilot signal interference while maintaining efficient resource utilization through structured assignment that allows multiple elements to be supported within the available resource pool.
Data Source
AI summary
A method for sending a signal, performed by a reconfigurable intelligent surface (RIS) array, includes: determining a mapping relationship between an active RIS array element in the RIS array and a time-frequency resource; sending the mapping relationship to a user equipment (UE); and sending a pilot signal to the UE by mapping the pilot signal sent by the active RIS array element to the time-frequency resource corresponding to the active RIS array element.