Precoding for Non-Linearity Correction in Wireless Communication
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Solution Overview
Problem
Wireless communication devices face challenges in reducing power consumption while maintaining signal quality, particularly when operating at high frequencies or with wide bandwidths, due to the non-linear operation of power amplifiers (PAs).
Innovation Solution
The method involves a user equipment (UE) receiving reference signals from a network node with multiple PAs, transmitting PA non-linearity (NL) coefficients to the network node, and receiving communications that have been precoded based on these coefficients to mitigate PA non-linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmitting device reduces power supplied to the power amplifier to reduce power consumption, then power consumption is reduced, but the PA operates in a non-linear region causing signal quality degradation
Solution Approach 1:
The transmitting device performs preliminary action by applying precoding to the signal before transmission. The precoder uses PA non-linearity coefficients to pre-compensate for the expected non-linear distortion, so that when the signal passes through the PA operating in non-linear region, the distortion effects are already corrected, maintaining signal quality while allowing reduced power operation
Solution Approach 2:
The system implements feedback by having the receiving device measure reference signals, estimate PA non-linearity coefficients, and feed them back to the transmitting device. The transmitting device then uses these coefficients to adjust the precoding, creating a closed-loop system that continuously optimizes signal quality while managing power consumption
2Reliability
If the receiving device performs digital post-distortion correction to correct non-linearity effects, then signal quality is improved, but device complexity increases
Solution Approach 1:
The invention extracts the non-linearity correction function from the receiving device and relocates it to the transmitting device. By performing precoding at the transmitter using PA non-linearity coefficients, the complex post-distortion correction processing is eliminated at the receiver, reducing receiving device complexity while maintaining signal quality
Solution Approach 2:
PA non-linearity coefficients serve as an intermediary that bridges the transmitter and receiver. These coefficients characterize the PA behavior and enable the transmitter to pre-compensate for non-linear effects, eliminating the need for complex receiver-side correction algorithms
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may precode communications with a precoding configured to improve non-linearity (NL). Some aspects more specifically relate to a user equipment (UE) obtaining power amplifier (PA) NL coefficients associated with NL of PAs of a network node. The UE may transmit an indication of the PA NL coefficients to the network node, which may use the indication to select precoding configured to improve reception of communications transmitted with PA NL or to improve decoding of communications transmitted using the precoding.