Uplink Carrier Aggregation Power Control for Intermodulation Limits

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Solution Overview

Problem

In wireless communication systems like EN-DC, supporting simultaneous transmitters with varying antenna-to-antenna isolation poses challenges that limit uplink performance due to intermodulation distortion and signal interference.

Innovation Solution

An uplink carrier aggregation architecture with a power control circuit that measures and adjusts power levels in multiple frequency bands to optimize signal transmission, using components like power detectors and amplifiers to manage intermodulation distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If simultaneous transmitters are activated in multiple frequency bands, then uplink data rate and communication capability are improved, but intermodulation distortion and signal interference increase due to varying antenna-to-antenna isolation

Engineering Contradiction:

Improveuplink data rateVSAvoidintermodulation distortion

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The system dynamically adjusts transmit power parameters for different frequency bands based on measured antenna-to-antenna isolation characteristics. The power control circuit modifies power levels in real-time to optimize uplink performance while maintaining interference below threshold levels, resolving the contradiction between high data rate and low intermodulation distortion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism where the power control circuit continuously measures antenna-to-antenna isolation and uses this information to adjust transmit power settings. This closed-loop control enables the system to adapt to varying isolation conditions and maintain optimal performance across different frequency bands simultaneously

Inventive Principle:

Principle #23Feedback

2Reliability

If transmit power is increased to improve signal quality, then communication reliability is improved, but intermodulation distortion increases and interferes with received signals

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsignal interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The power control circuit dynamically adjusts transmit power parameters based on measured antenna-to-antenna isolation characteristics, optimizing the balance between signal quality and interference levels. By modifying power settings in real-time, the system maintains reliable communication while minimizing harmful intermodulation effects

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system performs preliminary measurements of antenna-to-antenna isolation before transmission and uses this information to pre-adjust power settings that will prevent excessive intermodulation distortion. This proactive approach ensures that transmit power is optimized to achieve reliable communication without generating harmful interference

Inventive Principle:

Principle #9Preliminary anti-action

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

This architecture enhances uplink performance by accurately calculating and optimizing power levels, minimizing intermodulation distortion, and ensuring reliable simultaneous transmission across different frequency bands.

Implementation Method 1

a power detector module configured to measure the power of the signal to be transmitted in the first frequency band and the power of the received signal in the second frequency band

Methodology Applied

Scientific EffectPower detection:

Implementation Method 2

a first power amplifier that amplifies the signal to be transmitted in the first frequency band

Methodology Applied

Scientific EffectSignal amplification:

Implementation Method 3

an adjustment module configured to adjust the power of the signals to be transmitted in the first frequency band and/or the second frequency band by adjusting a power level associated with the respective first or second power amplifier

Methodology Applied

Scientific EffectPower control:

Data Source

PatentUS12593288B2Uplink carrier aggregation architecture with power control circuit

Publication Date: 2026.03.31 SKYWORKS SOLUTIONS INC

AI summary

Embodiments of the invention relate to an uplink carrier aggregation architecture including a first signal path, a second signal path, a third signal path and a power control circuit. Signals in a first frequency band are transmitted and received via the first signal path. Signals in a second frequency band are received via the second signal path and transmitted via the third signal path. The power control circuit is configured to measure a first power level associated with the first frequency band and a second power level associated with the second frequency band at the first signal path. The power control circuit is further configured to adjust the power of a signal to be transmitted in the first frequency band and/or a signal to be transmitted in the second frequency band.