Wifi model
[Model]

The wifi model simulates a wifi device. There are currently five radio propagation models implemented. The wifi device reports simulated link information for all corresponding nodes within range.

Worldfile properties

Simple Wifi Model
wifi
(
	# network properties
  ip "192.168.0.1"
  mac "08-00-20-ae-fd-7e"
  essid "test network"

	# radio propagation model
  model "simple"
	range 5
)
For the simple model it is only necessary to specify the range property which serves as the radio propagation radius.

Friis Outdoor Model
wifi
(
	# network properties
  ip "192.168.0.1"
  mac "08-00-20-ae-fd-7e"
  essid "test network"

	# radio propagation model
  model "friis"
	power 30
	sensitivity -80
)
The friis model simulates the path loss for each link according to Friis Transmission Equation. Basically it serves as a free space model. The parameters power(dbm) and sensitivity(dbm) are mandatory.

ITU Indoor Propagation Model
wifi
(
	# network properties
  ip "192.168.0.1"
  mac "08-00-20-ae-fd-7e"
  essid "test network"

	# radio propagation model
  model "ITU indoor"
	power 30
	sensitivity -70
	plc 30
)
This model estimates the path loss inside rooms or closed areas. The distance power loss coefficient must be set according to the environmental settings. Values vary between 20 to 35. Higher values indicate higher path loss.

Log Distance Path Loss Model
wifi
(
	# network properties
  ip "192.168.0.1"
  mac "08-00-20-ae-fd-7e"
  essid "test network"

	# radio propagation model
  model "log distance"
	power 30
	sensitivity -70
	ple 4
	sigma 6
)
The Log Distance Path Loss Model approximates the total path loss inside a building. It uses the path loss distance exponent (ple) which varies between 1.8 and 10 to accommodate for different environmental settings. A Gaussian random variable with zero mean and standard deviation sigma is used to reflect shadow fading.

Simple Raytracing Model
wifi
(
	# network properties
  ip "192.168.0.1"
  mac "08-00-20-ae-fd-7e"
  essid "test network"

	# radio propagation model
  model "raytrace"
	wall_factor 10
)
In this model Raytracing is used to reflect wifi-blocking obstacles within range. The wall_factor is used to specify how hard it is for the signal to penetrate obstacles.

Details
  • model
    • the model to use. Choose between the five existing radio propagation models
  • ip
    • the ip to fake
  • mac
    • the corresponding mac addess
  • essid
    • networks essid
  • freq
    • the operating frequency [default 2450 (MHz)]
  • power
    • Transmitter output power in dbm [default 45 (dbm)]
  • sensitivity
    • Receiver sensitivity in dbm [default -75 (dbm)]
  • range
    • propagation radius in meters used by simple model
  • plc
    • power loss coefficient used by the ITU Indoor model
  • ple
    • power loss exponent used by the Log Distance Path Loss Model
  • sigma
    • standard deviation used by Log Distance Path Loss Model
  • range_db
    • parameter used for visualization of radio wave propagation. It is usually set to a negative value to visualize a certain db range.
  • wall_factor
    • factor reflects the strength of obstacles

Generated on Thu Dec 13 13:55:22 2007 for Stage by  doxygen 1.4.6