Spectral Efficiency via Destructive Interference Cancellation

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Solution Overview

Problem

Wireless communications systems face limitations in spectrum efficiency due to interference and limited electromagnetic spectrum availability, especially with the increasing use of smartphones and other devices, which constrains effective transmission and reception of voice, data, and multimedia content.

Innovation Solution

The use of first and second transmitting elements to launch signals with desired and interference components, configured to cancel interference at the receiving element, allowing for improved signal-to-interference ratio and increased spectral efficiency through destructive interference cancellation, and the incorporation of corpuscular transmission/reception methods to provide additional capacity beyond electromagnetic spectrum limitations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple transmitters use the same frequency resources concurrently, then spectral efficiency increases, but interference between signals worsens

Engineering Contradiction:

Improvespectral efficiencyVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies interference cancellation techniques where received signals containing interference are processed to identify and subtract the interference components. By converting the harmful interference into a removable component through signal processing, the system recovers the desired signal while maintaining high spectral efficiency from concurrent frequency reuse

Inventive Principle:

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

Solution Approach 2:

The patent segments the received signal into desired signal components and interference components through signal processing. By separating these components mathematically, the system can eliminate interference while preserving the useful signal, enabling multiple transmitters to operate on the same frequency without degrading performance

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If electromagnetic spectrum bandwidth is increased to provide more capacity, then communication capacity increases, but spectrum availability constraints worsen due to limited spectrum resources

Engineering Contradiction:

Improvecommunication capacityVSAvoidspectrum availability

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter of signal processing techniques by implementing interference cancellation algorithms that operate on received signals. This parameter change enables the system to extract more capacity from the same limited spectrum by removing interference, effectively increasing communication capacity without requiring additional spectrum bandwidth

Inventive Principle:

Principle #35Parameter changes

3Reliability

If signal power is increased to improve reception quality, then signal-to-noise ratio improves, but interference levels also increase

Engineering Contradiction:

Improvesignal-to-noise ratioVSAvoidinterference levels

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the interference component from the received signal through signal processing operations. By taking out the interference portion mathematically, the system maintains reliable signal reception without needing to increase transmit power, thereby avoiding the generation of additional interference

Inventive Principle:

Principle #2Taking out (Extraction)

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 enhances spectral efficiency, reduces interference, and provides additional spectral capacity, potentially doubling or more than doubling effective spectral efficiency, while also enabling interference-free communications in military applications and improved commercial operations.

Implementation Method 1

the interference components of the first and second signals may at least partially add destructively at the receiving element

Methodology Applied

Scientific EffectDestructive interference: Interference

Data Source

PatentUS9806790B2Systems/methods of spectrally efficient communications

Publication Date: 2017.10.31 ODYSSEY WIRELESS

AI summary

First and second receivers are used to receive respective first and second signals, to process said first and second signals and provide respective first and second measures thereof to respective first and second transmitters. The first and second transmitters are configured to launch the first and second measures, respectively, each comprising a desired component that has originated at a desired source, and an interference component that has originated at an interfering source. The first and/or second transmitters are configured to process and launch the respective first and second measures, properly conditioned, so that upon interception thereof by a receiving element the interference components thereof add destructively and substantially cancel (or at least partially cancel) each other, whereas the desired components avoid substantial cancellation owing to a phase relationship therebetween that differs relative to a phase relationship between the interference components.