5G-NR PUSCH Channel Estimation via Time-Domain DMRS Analysis
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Solution Overview
Problem
Existing channel estimation methods for 5G-NR PUSCH face challenges in accurately measuring DMRS signals due to interference and noise, leading to suboptimal data demodulation performance.
Innovation Solution
The proposed solution involves converting frequency domain DMRS signals to the time domain, calculating power levels, and measuring pre-equalization SINR and PDP for each port to improve channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel estimation methods are used for 5G-NR PUSCH, then the process is simple, but measurement precision deteriorates due to interference and noise
Solution Approach 1:
The channel estimation process is segmented into distinct stages: frequency domain signal reception, conversion to time domain, power level calculation, and separate SINR/PDP measurements for each port. This segmentation allows targeted noise reduction and interference mitigation at each stage, improving overall measurement precision while maintaining manageable complexity through structured processing
Solution Approach 2:
The patent introduces intermediate processing steps including frequency-to-time domain conversion and power level calculation as mediators between the raw DMRS signals and final channel estimation. These intermediary processes enable better separation of signal components and more accurate interference characterization, thereby improving measurement precision
2Reliability
If frequency domain DMRS signals are used directly, then processing is straightforward, but noise and interference reduce estimation accuracy
Solution Approach 1:
The patent converts the harmful frequency domain representation, where noise and interference are mixed with signals, into a time domain representation through FFT conversion. This transformation allows for better identification and separation of signal components, converting the originally harmful mixed representation into a beneficial format for accurate channel estimation
Solution Approach 2:
The patent changes the domain parameter from frequency domain to time domain through FFT transformation. This parameter change fundamentally alters how the signal characteristics are represented, enabling more effective noise and interference mitigation by exploiting time-domain signal properties and structures that are not apparent in the frequency domain
Data Source
AI summary
A disclosed computer-implemented method may include (1) receiving a channel estimation signal comprising a plurality of frequency domain signals, each frequency domain signal corresponding to an antenna in a plurality of antennas, a port in a plurality of ports, and a demodulation reference signal sequence, (2) for each frequency domain signal, (A) converting the frequency domain signal to a time domain signal, and (B) determining a power level of the time domain signal, (3) determining, for each port in the plurality of ports (a) a sum of the power levels of the time domain signals corresponding to the port, each antenna in the plurality of antennas, and the DMRS sequence, and (b) based on the determined sum corresponding to the port, measuring (i) a pre-equalization signal-to-interference-plus noise ratio, and (ii) a power delay profile (PDP). Various other systems and methods are also disclosed.