Digital Signal Modulation Using Polarity-Based Carrier Inversion

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Solution Overview

Problem

Current modulation technologies in mobile communication systems, particularly in mobile radio, face challenges with high power consumption and error distortions due to the use of analog circuit blocks, which are inefficient and require more chip area, especially in integrated transmission devices.

Innovation Solution

A method and device that utilize a digital signal processing approach by dividing signals into components based on polarity, mixing with either a carrier signal or its inverted version, to achieve efficient modulation, thereby reducing power consumption and increasing the use of digital circuit blocks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If analog circuit blocks are used for modulation, then modulation functionality is achieved, but power consumption increases and error distortions occur

Engineering Contradiction:

Improvemodulation accuracyVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces analog circuit blocks with digital circuit blocks for signal modulation. Instead of using continuous analog signals and analog mixing circuits, the invention uses digital signal processing with discrete polarity determination and selective mixing based on digital signal values. This substitution eliminates the inherent errors and high power consumption of analog circuits while maintaining modulation functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the operating parameters by using digital signal levels (positive and negative polarities) instead of continuous analog signal variations. The modulation is achieved by detecting the polarity of digital signal components and selectively mixing with carrier or inverted carrier signals, thereby changing from analog parameter variation to digital parameter selection.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If analog circuit blocks are used for modulation, then modulation is achieved, but chip area increases

Engineering Contradiction:

Improvemodulation functionalityVSAvoidchip area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If digital circuit blocks are increased, then power efficiency improves, but analog-to-digital conversion complexity increases

Engineering Contradiction:

Improvepower efficiencyVSAvoidconversion complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent applies partial action by performing analog-to-digital conversion only for the polarity detection of signal components, rather than converting the entire signal spectrum. The baseband signal components are processed digitally for polarity determination, while the carrier mixing is performed selectively based on these partial digital conversions, reducing overall conversion complexity.

Inventive Principle:

Principle #16Partial or excessive 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 approach results in a more power-efficient modulation process with reduced errors and lower power consumption, suitable for mobile terminal devices, allowing for longer operation times and improved scalability with new semiconductor technologies.

Implementation Method 1

mixing the signal with the carrier signal when the signal comprises the first polarity, and mixing the signal with the inverted carrier signal when the signal comprises the second polarity

Methodology Applied

Scientific EffectSignal mixing:

Data Source

PatentUS8873667B2Digital modulation

Publication Date: 2014.10.28 INTEL CORP

AI summary

The present application relates to embodiments of methods and a device for digital modulation. In a first embodiment of the method, the following steps are executed:determining a polarity of the signal,providing an inverted carrier signal,providing an inverted signal by an inversion of the polarity of at least one portion of the signal,mixing the signal with the carrier signal when the signal has the first polarity, andmixing the inverted signal with the inverted carrier signal when the signal has the second polarity.