CSG250 Wireless Networks Spring 2007
GlomoSim Simulation Project 1 - GlomoSim Warm-up

I. setup GlomoSim simulator in your own UNIX account
You could access the instructions at
www.ccs.neu.edu/home/taojin/course/csg250.htm

II. Simulation of different Propation Models

In this simulation, you need to set up a 2-node wireless network with
different scenarios, in terms of propagation models.  Different
propagation models are supposed to achieve different attenuation in
signal transmission. Find out the corresponding transmission ranges of
8 settings obtained by varing the following 3 dimensions:

   TX Power: 1dBm, 10dBm
   RX Receive Threshold: -81.0dBm, -91dBm
   PROPAGATION-PATHLOSS: FREE-SPACE, TWO-RAY

Compare your results with the equations in section 2.3 of glomoman.pdf

Deliverables:

1. A brief description of your simulation procedure

2. Script file of command line output

3. A table, giving the transmission ranges for each of the 8 settings

4. A plot of TX power vs transmission range, for a fixed receive
threshold of -81.0dBm, for each of the two propagation-loss models.

5. A brief analysis or comparison of different propagation models

6. You can also be creative and try to tweak the radio parameters; for
instance, you could get ANTENNA-GAIN involved in your simulation to
check out the benefits or disadvantages of directionality of radios.


III. BER vs. Distance vs. PKT LOSS

1. Given fixed radio parameters, BER could be cast as a function of
Eb/N0, which varies with the distance between sender-receiver pair in
single hop network since the signal attenuates over distance. In this
simulation, you are required to explore the relation between distance
and BER by observing packet loss rate for different encoding schemes.

2. We choose constant-bit rate (CBR) as the traffic model for the
application upper layer; set packet length to 32B.  The script for the
config file is the following.

   CBR 0 1 5000 32 1S 0S 500S

3. Set following radio parameters in config.in

   RADIO-RX-TYPE BER-BASED
   BER-TABLE-FILE ./ber_bpsk.in
   RADIO-TX-POWER 1
   RADIO-RX-SENSITIVITY -100.9
   RADIO-RX-THRESHOLD -100.9

Feel free to edit any other parameters or config files to set up a
reasonable simulation scenario.

4. Plot the packet loss rate as a function of traffic distance,
varying the distance in steps of 10 ms, starting from a distance at
which there is nearly 0% packet loss and ending at a distance where
the packet loss is nearly 100%.

5. Change packet length to 256B, repeating the above simulation.

Deliverables:

1. Script file of your command line output
2. Brief description of simulation scenario
3. Plots of pkt loss rate vs. dist 

IV Effect of Receive-threshold on BER plot (BER vs distance)

   RADIO-RX-TYPE BER-BASED
   BER-TABLE-FILE ./ber_bpsk.in
   RADIO-TX-POWER 1

Vary RADIO-RX-SENSITIVITY and RADIO-RX-THRESHOLD between -95.0 dBm and
-100 dbm in decrements of -0.5 dbm, in each case setting both
parameters to be the same.  Obtain a plot of BER vs distance for each
setting.

Deliverables:

1. Script file of your command line output
2. The 10 BER vs distance plots.
3. Given an explanation for how the BER plots change as you change the
receive-threshold.