Delay-Doppler Reference Signal Configuration for Channel Estimation
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Solution Overview
Problem
Channel estimation in communication systems using higher frequency bands, such as 5G NR, faces challenges due to severe distortion from Doppler and delay spreads, where existing methods struggle to maintain performance and are affected by high peak-to-average power ratio (PAPR) issues.
Innovation Solution
The proposed method involves configuring specific reference signal regions in the delay-Doppler domain, using one-dimensional sequences with excellent auto-correlation characteristics, and employing complementary Golay sequences to alleviate interference and PAPR problems, allowing for accurate channel estimation while reducing signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel estimation methods are used in high-frequency bands, then channel estimation can be performed, but severe distortion from Doppler and delay spreads degrades estimation performance
Solution Approach 1:
The patent transforms the channel estimation problem from the traditional time-frequency domain to the delay-Doppler domain. By configuring reference signals in the delay-Doppler domain and performing estimation in this alternative dimensional space, the method effectively separates and compensates for Doppler and delay effects, thereby improving channel estimation performance under severe distortion conditions.
2Measurement precision
If reference signals are transmitted for channel estimation, then channel information can be obtained, but high peak-to-average power ratio (PAPR) issues arise
Solution Approach 1:
The patent changes the domain parameters in which reference signals are configured and processed. By moving from time-frequency domain to delay-Doppler domain, the signal characteristics change such that the PAPR is reduced while maintaining channel estimation accuracy. This parameter transformation allows the reference signals to have more favorable power distribution properties.
3Measurement precision
If multiple reference signals are used to improve estimation accuracy, then channel estimation performance enhances, but interference between reference signals occurs
Solution Approach 1:
The patent segments the delay-Doppler domain into distinct regions for different reference signals. By allocating specific delay-Doppler regions to different reference signals and ensuring proper separation, the method enables multiple reference signals to coexist without interference, thereby allowing improved estimation accuracy through multiple signals while avoiding the harmful interference effect.
Data Source
AI summary
An operation method of a transmitter in a communication system may comprise: configuring a first reference signal region for transmission of a first reference signal in the delay-Doppler domain; arranging the first reference signal having a sequence form in a specific region within the first reference signal region; transforming a delay-Doppler domain signal including the first reference signal into a time domain signal; and transmitting the time domain signal to a receiver.