Process for tunnelized cyclostationary to achieve low-energy spectrum sensing

Patent metadata

Field	Value
Publication number	US-10623215-B2
Application number	US-201715696123-A
Country	US
Kind code	B2
Filing date	Sep 5, 2017
Priority date	Nov 18, 2013
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A system and method that uses tunnelizing for analyzing frequency spectrum. The method may include the steps of under sampling an input signal to take samples in one or more tunnels each with a tunnel bandwidth that is equal to or less than a total analysis bandwidth of the input signal; detecting one or more cyclostationary features of the input signal based on the samples; and determining one or more signal types of the one or more cyclostationary features based on the one or more cyclostationary features.

First claim

What is claimed is:

1. A spectrum sensor, comprising:
a processing unit for processing digital signals representative of radio frequency signals processed by a radio frequency front end, wherein the processing unit comprises at least one processor and a memory section having instructions stored thereon that when executed directs the at least one processor to execute tunnelized second and higher-order cyclostationary instructions that process the digital signals over an analysis bandwidth to determine one or more signal types based on one or more second and higher order cyclostationary features and under sample the digital signals to generate one or more tunnels that have a respective tunnel bandwidth, wherein the tunnel bandwidth is less than or equal to the analysis bandwidth.

2. The spectrum sensor according to claim 1 , wherein the radio frequency front end comprises, at least one amplifier, and at least one mixer, configured to receive the radio frequency signals and process the radio frequency signals into downconverted signals from at least one antenna.

3. The spectrum sensor according to claim 2 , further comprising an analog to digital converter that processes the downconverted signals into the digital signals.

4. The spectrum sensor according to claim 1 , wherein the tunnelized second and higher-order cyclostationary instructions perform the following:
identify tunnelized signal samples from the one or more tunnels;
whiten the tunnelized signal samples to generate tunnelized and whitened signal samples;
produce a spectral correlation function of the tunnelized and whitened signal samples; and
detect the second and higher order cyclostationary features of the radio frequency signals by analyzing the spectral correlation function.

5. The spectrum sensor according to claim 1 , wherein the processing unit is communicatively coupled to an other system and provides the one or more signal types to the other system, wherein the other system processes the one or more signal types to provide at least one of: quantification of available spectrum, on-demand spectrum survey, spectrum measurement and calibration, labeling of spectrum systems, spectrum planning, spectrum mapping, coverage analysis for wireless deployment, terrain and topology shadowing, fading analysis, space-time-frequency spectrum hole identification, and identification and geo-location of interference sources.

6. The spectrum sensor according to claim 1 , wherein the one or more signal types are sent to a display, wherein the display is a computer display, a cell phone display, or a personal digital assistant (PDA) display.

7. The spectrum sensor according to claim 1 , wherein the one or more signal types are selected from Direct Television (DTV), Global System for Mobile (GSM), Wideband Code Division Multiple Access (WCDMA), and Long Term Evolution (LTE).

8. The spectrum sensor according to claim 1 , wherein the processing unit further comprises series or parallel processing of a signal detection algorithm, a narrow band blind signal classification algorithm, a non-blind signal detection algorithm, a blind frequency interval detection algorithm and a blind signal classification algorithm.

9. The spectrum sensor according to claim 1 , wherein the processing unit further comprises a channelizer configured to under sample the digital signals.

10. The spectrum sensor according to claim 1 , wherein the processing unit utilizes a Strip Spectral Correlation Analyzer (SSCA) algorithm that is applied to the one or more tunnels over the analysis bandwidth.

11. A spectrum sensing device, comprising:
at least one antenna;
a radio frequency front end coupled to the antenna and receiving radio frequency signals, wherein the radio frequency front end tunes to a frequency band and produces a downconverted signal;
an analog to digital converter for converting the downconverted signal to digitized data;
a processing unit for processing the digitized data, the processing unit comprising at least one processor and instructions that when executed by the at least one processor execute tunnelized second and higher-order cyclostationary instructions to determine one or more signal types based on one or more second and higher order cyclostationary features; and
a display for displaying the one or more signal types,
wherein the radio frequency front end collects signals over an analysis bandwidth, the tunnelized second and higher-order cyclostationary instructions comprise under sampling in one or more tunnels having a respective tunnel bandwidth, and wherein the tunnel bandwidth is less than or equal to the analysis bandwidth.

12. The spectrum sensing device according to claim 11 , wherein the display is a computer display, a cell phone display, or a personal digital assistant (PDA) display.

13. The spectrum sensing device according to claim 11 , wherein the processing unit is configured to:
identify tunnelized signal samples from the one or more tunnels;
whiten the tunnelized signal samples to generate tunnelized and whitened signal samples;
produce a spectral correlation function of the tunnelized and whitened signal samples; and
detect the second and higher order cyclostationary features by analyzing the spectral correlation function.

14. The spectrum sensing device according to claim 11 , wherein the processing unit is communicatively coupled to an other system and provides the one or more signal types to the other system, wherein the other system processes the one or more signal types to provide at least one of: quantification of available spectrum, on-demand spectrum survey, spectrum measurement and calibration, labeling of spectrum systems, spectrum planning, spectrum mapping, coverage analysis for wireless deployment, terrain and topology shadowing, fading analysis, space-time-frequency spectrum hole identification, and identification and geo-location of interference sources.

15. A non-transitory computer readable medium storing instructions executable by a processing device, the instructions causing the processing device to classify radio frequency signals by:
under sampling an input signal to generate one or more tunnels;
identifying tunnelized signal samples from the one or more tunnels, wherein the tunnelized signal samples have a bandwidth that is equal to or less than an analysis bandwidth of the radio frequency signals;
whitening the tunnelized signal samples resulting in tunnelized and whitened signal samples;
producing a spectral correlation function of the tunnelized and whitened signal samples; and
detecting a set of second and higher order cyclostationary features of the radio frequency signals by analyzing the spectral correlation function.

16. The non-transitory computer readable medium according to claim 15 , wherein the execution of the instructions further causes the processing device to determine one or more signal types from the set of second and higher order cyclostationary features.

17. The non-transitory computer readable medium according to claim 16 , wherein the processing device is communicatively coupled to an other system and provides the one or more signal types or the set of second and higher order cyclostationary features to the other system, wherein the other system processes the one or more signal types to provide at least one of: quantification of available spectrum, on-demand spectrum survey, spectrum measurement and calibration, spectrum labeling of systems, spectrum planning, spectrum mapping, coverage analysis for wireless deployment, terrain and topology shadowing, fading analy

Assignees

• Bae Sys Inf & Elect Sys Integ

Inventors

• Anthony Michael P
• Chuang Jack
• Mody Apurva N
• Spooner Chad M

Classifications

• H04L5/003

  Arrangements for allocating sub-channels of the transmission path · CPC title

• H04L27/0006 Primary

  Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14) · CPC title

• H04L12/4633

  Interconnection of networks using encapsulation techniques, e.g. tunneling · CPC title

• H04L27/0012

  arrangements for identifying the type of modulation · CPC title