Signal Processing for Radar and Wireless Coexistence

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Solution Overview

Problem

The increasing demand for wireless communications has led to spectrum congestion, particularly affecting radar systems due to interference from wireless communications devices, making it challenging for both technologies to operate simultaneously in shared frequency bands without significant disruptions.

Innovation Solution

A signal processing approach that enables simultaneous operation of radar and wireless communications systems by determining and isolating signals using a processor configured to minimize a cost function based on received signals, incorporating regularization functions, data-fidelity terms, and power spectral density, allowing for spatial and temporal overlap in shared spectra.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If radar systems operate in a given frequency spectrum, then radar performance is maintained, but wireless communications devices cannot operate in the same spectrum due to interference

Engineering Contradiction:

Improveradar performanceVSAvoidspectrum utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments the received signal into distinct components (radar signal and wireless communications signal) using signal processing techniques. By separating the mixed signal into individual components, the system can process each signal independently, allowing both radar and wireless communications to operate simultaneously in the same frequency spectrum without mutual interference

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary signal processing mechanism that mediates between the radar signal and wireless communications signal. This intermediary processing layer, involving cost function minimization and regularization, enables the coexistence of both signals by managing their interaction and extracting useful information from the mixed signal

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If wireless communications devices operate in shared spectrum, then spectrum utilization increases, but radar systems experience severe interference

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference to radar

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful interference from wireless communications signals into a beneficial situation by using the interference pattern itself as a distinguishing feature. Through cost function minimization and signal separation techniques, the system identifies and extracts the radar signal even in the presence of strong wireless communications interference, effectively turning the harmful interference into a manageable condition that allows both systems to coexist

Inventive Principle:

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

Solution Approach 2:

The patent changes key parameters of the signal processing approach, including using regularization functions and optimizing cost functions based on signal characteristics. By adjusting these parameters dynamically, the system can adapt to varying interference conditions and maintain reliable radar operation while allowing wireless communications to use the shared spectrum

Inventive Principle:

Principle #35Parameter changes

3Productivity

If complex radar systems are replaced with advanced spectrum sharing systems, then more spectrum becomes available for wireless communications, but system complexity and cost increase significantly

Engineering Contradiction:

Improvespectrum availabilityVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses a computational model (cost function) that replicates the signal separation process without requiring physical hardware changes. By using software-based signal processing that copies and processes the received signal through mathematical transformations, the system achieves spectrum sharing capabilities without the need for complex hardware replacements

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces complex mechanical or hardware-based spectrum sharing systems with a software-based signal processing approach. Instead of using physical filters, frequency converters, or complex antenna systems, the invention uses computational methods (cost function minimization, regularization) to achieve the same goal of enabling simultaneous operation of radar and wireless communications systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9713012B2Methods, devices and systems for enabling simultaneous operation of different technology based devices over a shared frequency spectrum

Publication Date: 2017.07.18 YASSINI FARD ROUZBEH DR

AI summary

In one example embodiment, a device includes a memory configured to store computer-readable instructions therein and a processor. The processor is configured to execute the computer-readable instructions to determine a first signal of a first technology in presence of interference from at least a second signal of a second technology, the first signal and the second signal being overlappingly transmitted, the determined first signal being used for processing of information associated with the first signal.