NTN Channel Estimation via Weighted Broadcast Merging
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Solution Overview
Problem
Non-terrestrial network (NTN) communication systems face challenges in channel estimation, particularly in weak electric fields and low signal-to-noise ratios, affecting the reception performance of narrowband physical downlink shared channels and control channels.
Innovation Solution
A method and device for improved channel estimation in NTN communication systems, involving channel estimation of multiple broadcast channels across frames, determination of weights for system information and broadcast channels, and calculation of channel estimates using these weights to enhance reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel estimation is used in NTN systems, then device complexity is reduced, but channel estimation precision deteriorates in weak electric fields and low SNR conditions
Solution Approach 1:
The patent merges channel estimation results from multiple broadcast channels (PBCH in first frame, NBCH in second frame) to form a composite channel estimate for system information. This combination of multiple estimation sources improves precision in weak signal conditions while distributing the estimation burden across different channels rather than concentrating complexity in a single estimation process
Solution Approach 2:
The patent performs preliminary channel estimation on broadcast channels before using these estimates for system information reception. By pre-establishing channel estimates from the broadcast channels in advance, the system prepares accurate channel knowledge before the critical system information decoding stage, improving overall estimation precision without adding complexity during the main data reception process
2Reliability
If channel estimation uses multiple broadcast channels and weights, then reception performance improves, but calculation complexity increases
Solution Approach 1:
The patent applies weighted combination of channel estimates from multiple broadcast channels, using partial information (weights) from each channel rather than requiring complete channel knowledge. This selective use of partial estimates from PBCH and NBCH with appropriate weighting achieves reliable system information reception while avoiding the excessive complexity of processing all possible channel information equally
Solution Approach 2:
The patent introduces weight parameters to control the contribution of each broadcast channel's channel estimate to the final system information estimation. By adjusting these weight parameters, the system optimizes reception performance for different signal conditions while maintaining a manageable calculation structure that scales with the number of broadcast channels used
Data Source
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AI summary
An operation method of a user equipment based on non-terrestrial network (NTN) communication includes: performing channel estimation of a first broadcast channel included in a first frame; performing initial channel estimation of system information included in the first frame; performing channel estimation of a second broadcast channel included in a second frame which is subsequent to the first frame; determining a first weight corresponding to the system information, a second weight corresponding to the first broadcast channel, and a third weight corresponding to the second channel; and calculating a channel estimate of the system information based on results of the channel estimation of the first broadcast channel, the initial channel estimation of the system information and the channel estimation of the second broadcast channel, and the first weight through the third weight.