Nonlinear Channel Estimation Using Single-Power DMRS Modeling
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately modeling nonlinear distortions in channel estimation, which affects the demodulation and decoding of data signals.
Innovation Solution
A network node is configured to transmit a nonlinear modeling capability indication and receive communications with a data signal and DMRS, where the DMRS is associated with a single transmission power value. The network node includes a reference signal processing component that generates a nonlinear model to remove nonlinear distortions during channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nonlinear modeling is applied to remove distortions during channel estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary nonlinear modeling and distortion removal during the channel estimation phase before data signal processing. By pre-processing the reference signals to remove nonlinear distortions caused by power amplifiers, the system establishes an accurate baseline channel model that simplifies subsequent data demodulation and decoding operations
Solution Approach 2:
The patent introduces an intermediary nonlinear modeling component that acts as a mediator between the received distorted reference signals and the channel estimation algorithm. This intermediary process generates corrected reference signals that bridge the gap between distorted transmissions and accurate channel characterization, improving measurement precision without requiring complete system redesign
2Ease of operation
If a single transmission power value is used for DMRS, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The system changes the parameter approach by using a single transmission power value for DMRS while compensating for nonlinear effects through digital signal processing. Instead of varying transmission power to achieve linearity, the patent transforms the approach by maintaining constant power and applying nonlinear modeling corrections during reception, thus preserving ease of operation while achieving accurate distortion compensation
Solution Approach 2:
The patent replaces the mechanical/power-domain solution (adjusting transmission power levels to avoid nonlinearities) with a signal-processing-domain solution (digital nonlinear modeling and distortion removal). This substitution allows the system to maintain simple single-power transmission while achieving accurate channel estimation through post-processing corrections
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit a nonlinear modeling capability indication associated with a nonlinear modeling configuration of the network node. The network node may receive, based on the nonlinear modeling capability indication, a communication in a slot, wherein the communication includes a data signal and at least one demodulation reference signal (DMRS), wherein the at least one DMRS is associated with a single transmission power value. Numerous other aspects are described.