DPD Feedback Using CSI-RS for Power Amplifier Nonlinearity Correction
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating and mitigating non-linearities in power amplifiers, which affect signal quality and efficiency in both network entities and user equipment.
Innovation Solution
Implementing a method for transmitting and receiving digital pre-distortion (DPD) information based on channel state information reference signals (CSI-RS) to estimate and correct non-linearities in power amplifiers, using feedback channels between network entities and user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion information is transmitted to estimate and correct power amplifier non-linearities, then signal quality and communication performance are improved, but device complexity and processing overhead increase
Solution Approach 1:
The system performs preliminary estimation of power amplifier non-linearities by transmitting CSI-RS reference signals and collecting UE measurements before actual data transmission. This advance characterization allows the network entity to pre-compute correction parameters, reducing real-time processing complexity during actual communication while maintaining high signal quality through pre-applied distortion correction.
Solution Approach 2:
The system implements a feedback mechanism where UEs measure the transmitted CSI-RS signals, estimate the power amplifier non-linearities, and return DPD information to the network entity. This closed-loop feedback enables continuous refinement of the distortion model and correction parameters, improving signal quality over time while distributing processing tasks between network and UE.
2Measurement precision
If DPD information is transmitted via feedback channel based on CSI-RS, then accuracy of non-linearity estimation is improved, but use of communication resources increases
Solution Approach 1:
The system repurposes the existing CSI-RS reference signals, originally designed for channel state information acquisition, to serve dual purposes: both channel characterization and power amplifier non-linearity estimation. This multi-functionality eliminates the need for separate dedicated pilot signals, maintaining high estimation accuracy while avoiding additional resource consumption for separate measurement signals.
Solution Approach 2:
The system leverages the natural transmission and reception processes already occurring in the communication system. The network entity transmits CSI-RS for its intended purpose, and the UE simultaneously uses these same signals to estimate non-linearities and generate DPD feedback. This self-service approach extracts additional value from existing communications without requiring separate dedicated resources for measurement and feedback.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, a reference signal. The UE may transmit, to the network entity and via a feedback channel, digital pre-distortion (DPD) information that is based at least in part on the reference signal, wherein the DPD information indicates an estimate of non-linearities of a power amplifier at the network entity based at least in part on the reference signal. Numerous other aspects are described.