Packet Collisions in 802.15.4 Networks

Simulation code for the analysis of concurrent transmission in IEEE 802.15.4 wireless networks. This is the accompanying code to the technical report available at ArXiv; the full paper appeared in IEEE Transactions on Wireless Communications 13(12) (On the Reception of Concurrent Transmissions in Wireless Sensor Networks).

Directories

• src: Python code for calculating the demodulator output of the receiver
• julia: re-implementation in Julia using @parallel, awesomely faster
• figs: matplotlib code used to generate some of the figures in the paper, to see how to use phitau.py
• collision-viz: re-implementation of the simulation code in JavaScript and the visualization applet code

Dependencies

Python

For the src/figs part, you need

• numpy/scipy
• matplotlib installation that supports TeX output (see the matplotlib help page)

Julia

For julia, you need

• the release version (v0.5) of Julia
• package NPZ (to read and write numpy data files)
• PyPlot (to call matplotlib from julia)
• DistributedArrays (for speed up by parallel computations)

Run it like this to enable parallel execution on worker threads (inside the subfolders in the figs folder):

$ julia -O 3 -p auto gen_ser_contour.jl unif soft

Example Outputs

BER Contour Plot

Plot of the bit error rate that a sender experiences when time or phase offsets are present.

MSK Waveform Plot

An example waveform of the physical signal when the sender employs the minimum shift keying modulation.