Power Backoff for Probabilistic Constellation Shaping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in power backoff procedures, particularly when employing probabilistic constellation shaping schemes, as existing methods fail to account for these schemes, leading to poor power peak-to-amplitude ratio (PAPR) and signal quality due to non-linear power amplifier operation.
Innovation Solution
The implementation of power backoff techniques that account for probabilistic constellation shaping schemes by determining power parameters based on constellation distribution parameters and modulation schemes, allowing for reduced PAPR and improved signal quality through precise power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power backoff procedures are used without accounting for probabilistic constellation shaping schemes, then the implementation is simple, but the power peak-to-amplitude ratio (PAPR) is poor and signal quality deteriorates due to non-linear power amplifier operation
Solution Approach 1:
The patent applies parameter changes by determining power parameters (such as maximum power reduction MPR and supplementary MPR) based on constellation distribution parameters and modulation schemes. This dynamic adjustment of power parameters according to the specific constellation shaping scheme being used enables the system to maintain optimal operation of the power amplifier, thereby improving signal quality and reducing PAPR while accounting for the specific characteristics of different modulation schemes
Solution Approach 2:
The patent implements dynamics by making the power backoff procedure adaptive to different constellation distribution parameters and modulation schemes. Rather than using fixed power backoff values, the system dynamically determines appropriate power parameters based on the active constellation shaping scheme, allowing the power amplifier to operate in its linear region and improving overall system reliability
2Productivity
If power levels are not accurately adjusted for probabilistic constellation shaping schemes, then the power amplifier can operate at higher power levels, but non-linear operation occurs leading to reduced communication efficiency
Solution Approach 1:
The patent applies feedback by using the constellation distribution parameter as input to determine the appropriate power parameters. This feedback mechanism ensures that the power amplifier operates at optimal power levels corresponding to the active constellation shaping scheme, preventing non-linear operation and maintaining high communication efficiency
Data Source
AI summary
Methods, systems, and devices for power backoff techniques for modulation schemes are described. A user equipment (UE) may receive an indication of a constellation distribution parameter and a modulation scheme to be used by the UE for an uplink message on an uplink channel. The UE may determine an uplink transmission power based at least in part on the indicated constellation distribution parameter and the indicated modulation scheme. The UE may transmit the uplink message using the indicated modulation scheme according to the determined uplink transmission power. In some examples, the UE may transmit a report indicating a power headroom parameter and an output power parameter based at least in part on the constellation distribution parameter.