Channel Estimation via Sparse Pilot Distribution in Millimeter-Wave Systems
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Solution Overview
Problem
In wireless communication systems, especially those using millimeter-wave technology, direct estimation of channel matrices is complex due to large antenna arrays, leading to increased overhead in reference signal transmission and reduced data rate, particularly in high-frequency bands where path loss and atmospheric absorption are significant.
Innovation Solution
An electronic device and method for channel estimation in wireless communication systems that distributes reference signals over a subset of frequency domain resources, allowing for estimation of channel states on these resources and derivation of channel conditions on other frequency domain ranges, reducing the need for dense pilot signal distribution across all frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are distributed across all frequency bands for channel estimation, then channel estimation accuracy is improved, but pilot transmission overhead increases and data rate decreases
Solution Approach 1:
The frequency domain resources are divided into multiple orthogonal frequency domain ranges, and reference signals are only transmitted in a subset of these ranges (first frequency domain range). The channel states in other frequency ranges are derived through interpolation or extrapolation based on the estimated channel paths, thus segmenting the reference signal transmission to reduce overhead while maintaining estimation accuracy.
Solution Approach 2:
The patent transmits reference signals only in specific local frequency domain ranges rather than uniformly across the entire bandwidth. This local quality approach allows concentrated pilot resources to be applied where most needed, reducing overall pilot overhead while maintaining channel estimation accuracy through local path estimation and global derivation.
2Measurement precision
If reference signals are distributed across all frequency bands for channel estimation, then channel estimation accuracy is improved, but data rate decreases
Solution Approach 1:
By segmenting the frequency domain into multiple orthogonal ranges and transmitting reference signals only in selected ranges, the patent reduces the number of pilot resources consumed, thereby freeing up more bandwidth for data transmission and improving overall data rate while maintaining channel estimation accuracy.
3Loss of information
If direct estimation of channel matrix is performed in millimeter wave systems with large antenna arrays, then complete channel information is obtained, but system complexity increases
Solution Approach 1:
The patent extracts and estimates only the essential channel path conditions from the channel states in the first frequency domain range, then uses these extracted path conditions to derive channel states in other frequency ranges. This extraction approach reduces the dimensionality of the estimation problem and simplifies the system complexity while maintaining channel information completeness.
Solution Approach 2:
The patent changes the estimation approach from directly estimating the full channel matrix to estimating channel path conditions (parameters) first, then deriving channel states from these parameters. This parameter transformation simplifies the complexity by working with fewer, more fundamental parameters rather than the complete high-dimensional channel matrix.
Data Source
AI summary
An electronic device and method for wireless communication system, and a storage medium. In the method, reference signal are carried merely on a part of communication sources for channel estimation, channel states on the communication resources carrying the reference signal are estimated, and conditions of channel paths from a transmitter to a receiver are estimated by using the estimated channel states of the communication resources. Thereby, channel states on other communication resources from the transmitter to the receiver can be obtained from the estimated channel path conditions.