DMRS Comb-Resource Channel Estimation for High-Path-Loss NR
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Solution Overview
Problem
The higher path loss in new radio (NR) networks due to higher frequencies leads to poor wireless signal coverage and inaccurate channel estimation, affecting the quality of service and increasing operating costs in cellular networks.
Innovation Solution
A channel estimation method involving the transmission of demodulation reference signals (DMRS) on a comb resource, transforming them to the time domain to superpose signal energy of equivalent pilot sequences for accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher frequencies are used in NR networks, then spectrum efficiency and capacity are improved, but path loss increases and signal coverage deteriorates
Solution Approach 1:
The patent transforms the channel estimation problem from the frequency domain to the time domain by applying inverse Fast Fourier Transform (IFFT) to the frequency-domain DMRS. This dimensional transformation enables the system to leverage time-domain signal characteristics to compensate for frequency-domain path loss effects, thereby improving signal coverage while maintaining high-frequency operation benefits
2Speed
If higher frequencies are used in NR networks, then data rate is improved, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent performs preliminary channel estimation using DMRS before actual data transmission. By estimating the channel characteristics in advance through the transformed pilot sequences and superposed signal energy, the system can compensate for frequency-selective fading and path loss effects during data demodulation, maintaining accurate channel estimation even at higher frequencies
Solution Approach 2:
The patent introduces transformed pilot sequences and superposed signal energy as intermediary elements between the transmitted DMRS and the final channel estimation. These intermediaries process the frequency-domain signals through IFFT transformation and energy superposition to create enhanced pilot signals that improve channel estimation accuracy for high-frequency operations
3Measurement precision
If DMRS is transmitted on comb resource with multiple frequency bands, then channel estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the comb resource into multiple frequency bands and processes each band's DMRS separately through IFFT transformation. This segmentation allows the system to handle complex multi-frequency channel estimation by breaking it down into manageable frequency components, reducing the computational burden while maintaining overall estimation accuracy
Data Source
AI summary
Provided by an example of the disclosure is a channel estimation method, the method being applied by a sending end and including: sending demodulation reference signals (DMRSs) on a comb resource; where after the demodulation reference signals (DMRSs) transmitted on different frequency bands of the comb resource are transformed to a time domain, pilot sequences that are equivalent are obtained; and signal energy of the plurality of equivalent pilot sequences is superposed, and is then used for channel estimation of a wireless transmission channel.