Single Carrier Signal Notch Clipping for Ambiguity Improvement

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Solution Overview

Problem

Single carrier signals face challenges in achieving low Peak-to-Average Power Ratio (PAPR) for sensing while maintaining high data throughput for communication, and often have poor ambiguity functions that lead to noise enhancement during processing.

Innovation Solution

Process single carrier signals by clipping the notches in the frequency domain to reduce small amplitude samples, resulting in a signal with fewer samples close to zero, thereby reducing noise enhancement and improving ambiguity function performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If single carrier signals are used for sensing and communication, then low PAPR is achieved, but poor ambiguity function leads to noise enhancement during processing

Engineering Contradiction:

ImprovePAPRVSAvoidambiguity function

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent modifies the frequency domain representation of the single carrier signal by changing the amplitude parameter of samples. Specifically, it identifies samples with amplitude below a threshold and increases their amplitude to meet a minimum requirement, thereby altering the signal's spectral characteristics to improve the ambiguity function while preserving low PAPR properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies amplitude correction to the frequency domain samples before the signal is transformed back to time domain and transmitted. This preliminary modification ensures that the signal has improved ambiguity function characteristics from the outset, preventing noise enhancement issues that would otherwise occur during subsequent processing

Inventive Principle:

Principle #10Preliminary action

2Loss of energy

If single carrier signals are used, then low PAPR is achieved for sensing, but high data throughput for communication is compromised

Engineering Contradiction:

ImprovePAPRVSAvoiddata throughput

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent creates a single carrier signal that serves dual purposes for both sensing and communication applications. By modifying the frequency domain representation to improve ambiguity function while maintaining low PAPR, the signal becomes universally suitable for both sensing (requiring low PAPR and good ambiguity function) and communication (requiring high data throughput), eliminating the need for separate signal designs

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If frequency domain processing is applied to improve ambiguity function, then sensing performance improves, but noise enhancement occurs

Engineering Contradiction:

Improvesensing performanceVSAvoidnoise enhancement

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent performs amplitude correction on the frequency domain representation before the signal is transmitted and before any sensing processing occurs. By pre-adjusting the amplitude of frequency samples to meet minimum thresholds, the signal inherently possesses better ambiguity function characteristics, which prevents noise enhancement during subsequent sensing operations rather than attempting to correct it afterward

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250310171A1Methods and apparatus for communicating single carrier signals

Publication Date: 2025.10.02 HUAWEI TECH CO LTD

AI summary

A method involves processing a single carrier signal to increase the amplitude of at least some of the samples of the single carrier signal in the frequency domain, and transmitting the single carrier signal.