OASIS. Application Software for Spectrum Monitoring and Interference Analysis

Transcription

1 OASIS Application Software for Spectrum Monitoring and Interference Analysis

2 OASIS Features User friendly Operator interface Hardware independent solution Choose the receiver that you already own or that best fits your needs and budget Provides a common user interface for setup and control of all hardware Record spectrum activity for later playback and evaluation Raw data is stored to allow maximum flexibility in subsequent data analysis

3 OASIS Features View & record multiple bands simultaneously using one or more receivers Simultaneously replay and compare data from multiple logged files and/or with live data Remote control of test instruments allows the user to change test scenarios and monitor spectrum activity without going to the site Control multiple monitoring sites from one location Emission masks can be created from data, imported from channel plans, or created using OASIS

4 OASIS Features Using an on-board database, quickly identify licensed and unlicensed emitters, non-compliant emissions, and changes in the RF environment Database Options NTIA Regulatory Rules for the US ITU Regulatory Rules (Regions 1, 2 and 3) FCC database available from Summitek as an option Import your own database Create a database from measurements IM Analysis tools to determine potential sources of interference

5 OASIS Features Data Processing Options Peak Hold Averaging Alarm events based on exceeding emission mask Jump to alarm event Jump to time in a log file Channel Occupancy Statistics Export raw data

6 OASIS Features Display Options 2D display of Magnitude vs. Frequency 3D display (color waterfall format) of Magnitude vs. Frequency vs. Time Markers Reports Alarm break histogram Distribution plots Average Power vs. Time Channel Activity vs. Time

7 OASIS Applications Perform site surveys Measure Channel Occupancy statistics Identify non-compliant emissions Generate a list of potential interference sources based on actual measurements Characterize time variant behavior Drive Test - Mapping signal strength as a function of position

8 OASIS Applications Validate wireless network deployment plans Identify channels least likely to suffer interference at a particular location Create a database of emitters Baseline the electromagnetic environment at a site for future comparison Locate rogue transmitters

9 OASIS Architecture OASIS Local or Remote PC Local or Remote PC Hardware Group Hardware Group Processes Operator Actions Test Setup Data Acquisition Data Processing Data Presentation Local or Remote PC Hardware Control Instrument Setup Error Handling Read Data Return Data to OASIS Hardware Group Computer Controlled Hardware at a Site, for example: RF Receiver Antennas GPS Receiver

10 OASIS Scenarios OASIS and the Remote Agent running on the same computer GPS Hardware Group A Case 1: Local control of a Hardware Group Laptop Spectrum Analyzer GPS Hardware Group B Computer Case 2: Remote control of a Hardware Group TCP-IP Network Spectrum Analyzer

11 OASIS Scenarios Multiple Users accessing Multiple Hardware Groups GPS Hardware Group A Laptop TCP-IP Network Laptop Local or Remote Control of Instruments Spectrum Analyzer GPS Hardware Group B Computer Computer TCP-IP Network SITES Running OASIS or remote desktop connectivity Sites remotely running OASIS controlled by remote desktop connectivity Spectrum Analyzer

12 OASIS Capabilities Control and monitor multiple sites from a master location Simultaneously observe and record multiple frequency bands Apply emission masks to quickly identify changes in the electromagnetic environment Use OASIS Scheduler to define a complex set of monitoring tasks and run them without operator interaction

13 OASIS extends the capabilities of your spectrum analyzer A spectrum analyzer gives you a look at a moment in time. OASIS creates a history for post-processing and analysis.

14 OASIS Value Added Archival storage of data Unattended operation Capture and characterize transient events without keeping an engineer or technician in the field Post processing allows data to be analyzed in a variety of ways, some of which might not have been anticipated in advance No need to go back to the site to collect data in a different manner Applying emission masks exposes deviations from normal that might otherwise go unnoticed Quickly identify changes in the RF environment at your sites that might impact the quality of your wireless network

15 Benefits of Archival Storage Unattended operation reduces troubleshooting costs Prevents missing transient events Filter the data to quickly focus on events of interest Output a list of noteworthy events, including time start and stop, frequency, bandwidth, magnitude Replay data to view noteworthy events Compare current to historic data has anything changed at the site?

16 Channel Activity Plot

17 Who s Here Determines What RF Transmissions are Present at the Site Compare emitter characteristics to database Add unlicensed, but legal transmitters to the database

18 Associate Emissions with a License

19 And View the Location on the Map Your location Identified Emitter

20 Create a Mask to Evaluate Spectrum Usage No emissions should occur within my licensed band 2D/3D Display Format

21 Initial Results of Monitoring Shows No Unauthorized Transmissions 3D Display Shows On/Off Characteristic of Nearby Transmitters In 2D Display, the Red Trace is Peak Hold Data and the Yellow Trace is the Current Sweep. This can be done in real time or on logged data.

22 After Extensive, Unattended Monitoring Unauthorized Emission Captured 3D Display Shows that the unauthorized emission was on briefly Peak Hold in 2D display shows the captured signal. Data can be remotely monitored

23 Alarm Histogram Graphically displays the frequencies at which alarm breaks occurred Slider is used to determine the time

24 Replay the Log File to Evaluate the Event as if You Were There in Real Time Jump to Time feature gets you immediately to the time of interest

25 Replay the Log File The 3D display provides a time history of the event. The 2D display is a snapshot of the spectrum during the event.

26 Remote Monitoring Saves Time and Money Unauthorized emission captured without keeping a person in the field. Time of event reliably captured and accurately recorded RF emission characteristics evaluated by replaying the data If event occurs at the same time each day, you know when to go look for the source

27 Smart DF Is Used to Locate the Source of Unlicensed Emissions

28 Drive Test Data Display signal strength as a function of location on a map. Using a GPS receiver, a spectrum analyzer and OASIS, users can create log files while driving No user interaction required, enhances safety while driving Log broad frequency ranges, eliminates driving the same area multiple times Save log files for future comparison of drive test data. No need to purchase additional hardware!

29 Apply Emission Masks An example of an emission mask (shown in green) created from measured data. Emission masks can also be imported, for example, a basestation channel plan, or created with the OASIS Limits tool.

30 When Monitoring Identifies Unwanted Emissions in Your Band

31 Make a broadband measurement of the local RF environment Create a database of transmitters in the area Use this database to determine which of these can create interference in your band Find rogue transmitters that are occupying your spectrum

32 Create a List of Suspects That Can Interfere with You Don t waste time looking at emissions that cannot generate a signal with the characteristics of the unwanted emission measured.

33 OASIS Time Correlation Algorithms Identify Interference from Non-continuous Emitters

34 Capabilities Summary Works with most remotely controllable RF receivers/spectrum analyzers Spectrum Monitoring Utilities Interference Detection and Identification Record, Archive and Post-process and Replay Data Licensed Database Enhances Emitter ID, But Not Required Use Actual Measurements to Build a Database ID Non-IM Interference Out of Band Emissions Mistuned Transmitters Transmitters That Drift Off Frequency Illegal Transmitters Adjacent Channel Interference