UBDM Constant-Envelope Modulation for Nonlinear Power Amplifiers

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Wireless communication systems face interference and distortion due to nonlinearity in amplifiers, leading to inaccurate data decoding and vulnerability to eavesdropping.

Innovation Solution

Implementing unitary braid division multiplexing (UBDM) with constant envelope modulation, such as frequency modulation (FM), to transform and secure data symbols, using scaling and limiting techniques to reduce frequency deviation and mitigate amplifier nonlinearity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If conventional modulation schemes (QAM) are used to increase data transmission capacity, then the number of bits conveyed per symbol increases, but the signal becomes more susceptible to amplifier nonlinearity and distortion

Engineering Contradiction:

Improvedata transmission capacityVSAvoidsignal accuracy

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent transforms the modulation scheme from conventional QAM to UBDM-PM, changing the fundamental parameters of signal representation. Instead of using amplitude and phase variations in QAM, the invention uses phase-only modulation with constant envelope signals, fundamentally altering how information is encoded to achieve both high capacity and robustness against nonlinearity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional I/Q amplitude modulation mechanism with a phase-based modulation mechanism. By substituting the mechanical/amplitude-based QAM system with a phase-based UBDM-PM system, the invention eliminates the susceptibility to amplifier nonlinearity while maintaining high data transmission capacity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Power

If high power amplification is used to increase transmission range, then signal coverage improves, but amplifier nonlinearity increases causing signal distortion

Engineering Contradiction:

Improvetransmission powerVSAvoidamplifier nonlinearity

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful effect of amplifier nonlinearity into a beneficial feature by using constant envelope signals. The nonlinearity that would normally distort amplitude-based modulation actually preserves the integrity of phase-based constant envelope signals, turning the amplifier's weakness into an advantage for maintaining signal quality at high power levels

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention changes the signal parameter from amplitude-variable to phase-only with constant envelope. This parameter transformation allows the system to operate in the nonlinear region of power amplifiers without suffering from the usual distortion problems, as the constant envelope preserves signal integrity even when amplitude distortion occurs

Inventive Principle:

Principle #35Parameter changes

3Reliability

If UBDM transform is applied to increase security and reduce interference, then signal robustness improves, but frequency deviation increases requiring scaling and limiting

Engineering Contradiction:

Improvesignal robustnessVSAvoidfrequency deviation

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent applies scaling and limiting operations to transform the UBDM-transformed symbols, changing the frequency deviation parameter to meet regulatory requirements. This parameter transformation allows the system to maintain the robustness benefits of UBDM while complying with spectral mask constraints through controlled frequency deviation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The scaling and limiting operations serve as intermediary steps between the UBDM transform and the final frequency modulation. These intermediary operations control the frequency deviation to acceptable levels while preserving the core benefits of UBDM transformation, acting as a bridge between signal robustness and regulatory compliance

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances secure communication by reducing interference and distortion, allowing accurate data recovery and preventing eavesdropping while complying with regulatory frequency limits.

Implementation Method 1

frequency modulation (FM), to transform and secure data symbols, using scaling and limiting techniques to reduce frequency deviation and mitigate amplifier nonlinearity

Methodology Applied

Scientific EffectFrequency modulation: Phase Modulation

Data Source

PatentUS12587419B2Constant envelope modulated unitary braid division multiplexing

Publication Date: 2026.03.24 RAMPART COMMUNICATIONS INC

AI summary

A transmitter may obtain a plurality of symbols encoding data to transmit wirelessly. A transmitter may transform the plurality of symbols using a unitary braid division multiplexing transform to produce a plurality of transformed symbols. A transmitter may scale the plurality of transformed symbols produce a plurality of scaled symbols. A transmitter may modulate a carrier signal by the plurality of scaled symbols to produce a constant envelope signal. A transmitter may transmit the modulated signal.