Time-Domain Channel Estimation Using Multi-Slot Correlation
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Solution Overview
Problem
Existing channel estimation methods in wireless communications have limited precision, affecting baseband demodulation performance due to noise reduction processing mainly performed in the frequency domain.
Innovation Solution
A channel estimation method that determines a time-domain channel estimate by combining signals from multiple slots using time-domain correlation, improving estimation accuracy and noise reduction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency-domain channel estimation is used, then existing algorithms can be applied, but estimation precision is limited which affects baseband demodulation performance
Solution Approach 1:
The patent transitions from frequency-domain channel estimation to time-domain channel estimation. By computing channel estimates in the time domain using time-domain correlation between pilot signals across multiple slots, the system achieves superior estimation precision that directly improves baseband demodulation performance, resolving the limitation of frequency-domain methods.
Solution Approach 2:
The patent combines channel estimation from multiple slots (first slot and second slot) through time-domain correlation to produce an enhanced channel estimate for the first slot. This merging of information across multiple time slots improves estimation precision and noise reduction performance, thereby improving baseband demodulation performance.
2Measurement precision
If time-domain channel estimation using multiple slots is implemented, then estimation precision and noise reduction performance improve, but processing complexity increases
Solution Approach 1:
The patent performs preliminary channel estimation for both the first slot and second slot before computing the final time-domain channel estimate. This preliminary action provides the necessary channel information in advance, enabling the subsequent time-domain correlation to proceed efficiently and reducing overall processing complexity while maintaining high estimation precision.
Data Source
AI summary
This application discloses a channel estimation method and apparatus. When time-domain channel estimation is performed on a first slot, the first slot and at least one second slot are first determined. The first slot and each second slot form continuous slots. Then, a first signal corresponding to the first slot and a second signal corresponding to each second slot are obtained, and a time-domain channel estimate for the first slot is determined based on the first signal and each second signal. In embodiments of this application, when a time-domain channel estimate for a specific slot is determined, time-domain channel estimation is performed by using time-domain correlation of channels in combination with signals of a plurality of slots, so as to obtain a more accurate channel estimation result, thereby improving baseband demodulation performance.