Data Modulation Constellation Scaling for Power Amplifier Linearity
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Solution Overview
Problem
In high-frequency wireless communication systems like 5G, terminals at different distances from the service node require different modulation manners, leading to high peak-to-average power ratios that strain power amplifiers, necessitating inefficient power back-off and limiting amplifier performance.
Innovation Solution
A data modulation method that determines a modulation parameter A based on the modulation manner, using a target constellation point symbol to modulate data, allowing flexible power control and reducing the need for power back-off, thereby improving efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a modulation manner with relatively high transmission power is adopted, then the transmission distance and coverage are improved, but the peak to average power ratio becomes high, causing the power amplifier to operate inefficiently and requiring power back-off
Solution Approach 1:
The patent applies dynamics by making the constellation points movable and adjustable rather than fixed. The target constellation points are dynamically generated by scaling the initial constellation points with a modulation parameter A, allowing the system to adapt the signal characteristics to match the power amplifier's linear working region requirements while maintaining high transmission power capability
Solution Approach 2:
The patent changes the parameter of constellation point amplitude by introducing a modulation parameter A that scales the initial constellation points. This parameter adjustment allows the signal to be optimized for the power amplifier's operating characteristics, enabling high transmission power without exceeding the amplifier's linear region limits
2Reliability
If power back-off is applied to keep the power amplifier away from saturation region, then the linearity of the power amplifier is improved, but the modulation efficiency is reduced and the system becomes limited in improvement
Solution Approach 1:
The patent applies preliminary action by pre-scaling the constellation points with modulation parameter A before transmission. This preliminary adjustment of the signal characteristics ensures that the power amplifier operates within its linear region without requiring additional power back-off during transmission, thereby maintaining both linearity and efficiency
Solution Approach 2:
The patent changes the amplitude parameter of the modulation signal by introducing scaling factor A. This parameter modification allows the system to achieve optimal power amplifier operation without sacrificing modulation efficiency, as the scaled constellation points are specifically designed to match the amplifier's linear working characteristics
3Reliability
If different modulation manners are used for terminals at different distances, then the communication quality for various terminals is improved, but the peak to average power ratio increases, straining the power amplifier
Solution Approach 1:
The patent applies local quality by assigning different modulation parameters A to different terminals based on their specific communication requirements and distances. Each terminal receives customized target constellation points scaled by its own modulation parameter, allowing optimal communication quality for each terminal while controlling the overall peak to average power ratio through localized parameter adjustment
Data Source
AI summary
Provided are a data modulation method and device, a data demodulation method and device, a service node, a terminal, and a medium. The data modulation method is applied to the service node, and the data modulation method includes that: a modulation parameter A is determined according to a modulation manner of data; and the data is modulated according to a target constellation point symbol, where the target constellation point symbol is a product of A and X, and X is an initial constellation point symbol corresponding to the modulation manner.