Spread-Spectrum Interference Estimation via Quantization

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Solution Overview

Problem

Existing spread-spectrum communication systems face interference issues due to in-band or intentional jamming, which degrade system performance and are not effectively mitigated by current techniques.

Innovation Solution

The method involves estimating and mitigating interference using quantization, where a high-resolution digital signal is processed by a quantizer to separate the signal of interest from the interfering signal, with the interfering signal being estimated as quantization noise, and subsequently subtracted from the original signal to produce an interference-mitigated signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If notch filtering or interference subtraction techniques are used to mitigate interfering signals, then interference rejection capability is improved, but device complexity increases

Engineering Contradiction:

Improveinterference rejection capabilityVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts the interfering signal from the composite received signal by using a quantizer to separate it based on amplitude differences. The quantizer outputs represent only the interfering signal, which is then subtracted from the original received signal to leave the signal of interest with reduced interference.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter of signal resolution by using a quantizer with sufficient resolution to distinguish the interfering signal from the signal of interest. By operating the quantizer at a resolution level where the signal of interest falls within the quantization noise floor, the system can isolate and remove interference without requiring complex filtering algorithms.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If high-resolution digitization is used to capture both signal of interest and interfering signal, then measurement precision is improved, but loss of useful signal in quantization noise increases

Engineering Contradiction:

Improvedigitization precisionVSAvoidsignal of interest in quantization noise

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent converts the harmful quantization noise into a beneficial tool for interference estimation. By deliberately allowing the signal of interest to be buried in quantization noise, the system can use the quantizer outputs to estimate and remove the interfering signal, ultimately improving the quality of the recovered signal of interest.

Inventive Principle:

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

Data Source

PatentUS9503154B2Methods and systems for interference estimation via quantization in spread-spectrum systems

Publication Date: 2016.11.22 TRELLISWARE TECHNOLOGIES INC

AI summary

A method for interference estimation and mitigation includes receiving a high-resolution digital signal. The high-resolution digital signal comprises a signal of interest and an interfering signal. An estimate of the interfering signal is generated using a quantizer. The signal of interest is in a quantization noise of the quantizer. An interference-mitigated signal of interest is generated based on a difference of the estimate of the interfering signal and the high-resolution digital signal.