NTN Uplink Channel Pre-Compensation for Phase-Continuous PUSCH
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Solution Overview
Problem
In non-terrestrial networks, rapid changes in time offset due to satellite movement disrupt power consistency and phase continuity, leading to reduced joint channel estimation performance.
Innovation Solution
A method involving pre-compensation operations for phase and time shifts is applied to the physical uplink shared channel (PUSCH) transmission, using phase and cyclic shifts based on predicted timing offsets and IFFT operations to maintain power consistency and phase continuity within a time domain window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing advance control is applied to adjust transmission timing due to satellite movement, then uplink signal arrival timing is improved, but power consistency and phase continuity are disrupted
Solution Approach 1:
The patent applies pre-compensation operations before transmission to counteract the effects of timing advance control. By calculating and applying phase and time shifts in advance based on predicted satellite movement, the system maintains power consistency and phase continuity while still achieving accurate uplink signal arrival timing at the base station.
Solution Approach 2:
The patent dynamically adjusts transmission parameters including phase shifts, time shifts, and cyclic shifts based on satellite position and movement predictions. These parameter changes are applied to maintain signal integrity despite timing adjustments required by satellite motion, resolving the contradiction between timing accuracy and signal stability.
2Measurement precision
If transmission timing is changed frequently to track satellite movement, then signal arrival accuracy is improved, but joint channel estimation performance deteriorates
Solution Approach 1:
The system performs preliminary channel estimation using reference signals transmitted before actual data transmission. By establishing channel conditions in advance and applying pre-compensation, the system maintains reliable joint channel estimation even as timing adjustments are made to track satellite movement.
Solution Approach 2:
The patent implements feedback mechanisms where channel estimation results are used to refine timing advance predictions and pre-compensation parameters. This closed-loop approach ensures that signal arrival accuracy is maintained while preserving joint channel estimation performance through continuous optimization.
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving an uplink channel in a non-terrestrial network. A method of a first communication node comprises the steps of: mapping modulation symbols and reference signals to a resource area; obtaining information about a phase shift for each subcarrier in the resource area; applying the phase shift to each subcarrier to perform a first pre-compensation operation on the phase; and transmitting, to a second communication node, a signal that has had the first pre-compensation operation applied thereto.