Loading in 5 sec....

Introduction to Simulating radio propagation models and COOJA ARMPowerPoint Presentation

Introduction to Simulating radio propagation models and COOJA ARM

- 241 Views
- Updated On :

Introduction to Simulating radio propagation models and COOJA ARM. One radio…. REFRACTION. REFLECTION. DIFFRACTION. … receiving a radio signal Typically 4 different categories Problem: What happens to the radio signal? (And how is sound quality affected?). SCATTERING.

Related searches for Introduction to

Download Presentation
## PowerPoint Slideshow about 'Introduction to' - PamelaLan

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### Introduction toSimulating radio propagation modelsand COOJA ARM

One radio…

REFRACTION

REFLECTION

DIFFRACTION

- … receiving a radio signal
- Typically 4 different categories
- Problem:
- What happens to the radio signal?
- (And how is sound quality affected?)

SCATTERING

WSN radio model types

- Unit Disk Graph
- COOJA’s Standard Radio Medium

- Bit Error Ratio (BER)
- Collected statistical data (or empirical models)
- Ray tracing

COOJA ARM

- Advanced Radio Medium
- “Advanced” when compared to “Standard” :)
- Radio propagation models introduction
- How ARM works

Wiki’s definitions

- Radio Propagation
“... is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another.”

- Radio Propagation Model
“... characterization of radio wave propagation as a function of frequency, distance and other conditions.”

Empirical models

- Lots of different models exist
- Outdoor
- City, Terrain, Rain, Earth curvature
- Okumura model built using data collected in Tokyo

- Indoor
- ITU Model for indoor Attenuation
- Log Distance Path Loss Model
- Typical parameters: frequency, distance, number of floors, coefficients tuned to different environments etc.

- Above models based on empirical data

Analytical approach

- Based on ray tracing
- Calculates multi-path effects
- Used in COOJA ARM

Small-scale vs. Large-scale

- Small-scale effects
- Sum of many received signal from different directions
- Often Gaussian random
- Scattering

- Large-scale effects
- Shadowing
- Reflections

Free Space Propagation Model

- (FSPL)
- Predicts signal strength for LOS paths

Antenna gains

Wavelength

Transmitted vs. received power

Distance

Ray tracing in ARM

- 2D positions
- Supports attenuating obstacles
- Only rectangles

- Refractions
- Reflections
- Diffractions
- Potential support:
- Scatterings

Using ARM

- Registers two plugins
- Changing formula parameters
- Visualizing radio coverage

- Listens to all radios in the simulation
- Transmitted power
- Antenna gains
- Packet lengths
- SNR threshold
- (Channel)

FSPL mentioned earlier

Fixed “penalty” constants

FUTURE:Should be replaced by angle dependent formulas

Maximum values used by ray tracer

May become very time-consuming =)

Formula ViewerProperty of obstacle type(wood, glass, metal)

Formula ViewerArea Viewer

- Shows radios, obstacles and channel propagation

Area Viewer

- Obstacles are set by analyzing the background image

Area Viewer

- User may track ray paths from a transmitter to a point
- Uses the current formula settings

Area Viewer

- Show surroundings of transmitter:
- Signal strength
- SNR ratio
- Probability of reception
- Delay spread

Area Viewer

Received signal strength vs. Probability of reception

Future work

- Validate models
- Parameter estimation / Model calibration
- From actual measurements

Download Presentation

Connecting to Server..