TDDC22 Mobile wireless networks
Telecommunicationslab
Get started (write these two commands)
module use /site/edu/it/medieinformatik
module add mi-module
Manual to most commands are read Manual till de flesta kommandon nås med kommdot man
man <command>
Manual pages
man tkt
Overview of telecommunications programs
Data files are found at /site/edu/it/medieinformatik/telekomlab
4fso
4g7g
g04fso_5.1x1km.1000
g04fso_5.1x1km.pgm
g04fso_5.1x1km.pnm
il-76-1.pgm
il-76-1.592.395
library with raster map
library with vector map
Image with map in grayscale (raw format)
Image with map in grayscale
Image with map in colour scale
Image with airplane (pgm-format)
Image with airplane (raw format)
File with data to communications programs at /site/edu/it/medieinformatik/telekomlab
2pam.mod
G.7.4
H.7.4
G.15.11
H.15.11
Modulation type
Generator matrix to Hamming (7,4) kod
Parity check matrix to the code above
Generator matrix to Hamming (15,11) kod
Parity check matrix to the code above
Programs
pgm2bin
bin2pgm
Convert pgm-format to bin-format
Convert bin-format till pgm-format
awgn
bsc
Channel with additive white gaussian noice
Binary symmetric channel
mod
demod
Modulator
Demodulator
matenc
cmpdec
Matrix coder
Decoder
compress
uncompress
gzip
gunzip
File compression
File decompression
File compression
File decompression
cjpeg
djpeg
codetree
decdtree
jpeg encoder
jpeg decoder
SPITH-encoder
SPITH-decoder
xv
Imageviewer
Exemples
1. Convert an image in pgm-format to bin-format, send it through a binary channel with error probability 0.1,
convert the image back to pgm-format and view it on the screen.
pgm2bin < il-76-1.pgm | bsc 0.1 | bin2pgm -w 592 -h 395 -b 8| xv 2. Compress an image in raw-format with the SPITH-encoder to 0.2 bit/pixel and store data in the file tmp.spt.
codetree il-76-1.592.395 tmp.spt 395 592 1 0.2
3. Decompress the file slask.spt comressed with SPITH to 0.2 bit/pixel and store the image in the file tmp.raw.
decdtree -s slask.spt tmp.raw 0.2
4. Compress a pgm-format image with jpeg with qualityparameter se to 10, decompress the image and view it.
cjpeg -Q 10 il-76-1.pgm | djpeg | xv 5. Generate a sequence of 1000 random bits, modulate the sequence with 2pam (2-pulse amplitude modulation)
with energy 0.5 per bit, send the bits through a channel with additive white gaussian noice with spectral density 0.1, demodulate and count the number of errors.
sou 1000 | mod 2pam -b 0.5 | awgn 0.1 |demod 2pam -b 0.5 | check
6. Generate 100 random bits, encode them with a Hamming (7,4)-code, send them through a binary channel with
bit error probability 0.013, decode the received bits and count the number of errors.
sou 100 | matenc G.7.4 | bsc 0.013 | cmpdec G.7.4 | check
7. Generate 100 random bits, encode them with Hamming (15,11)-code, send them through a binary channel
with bit error probability 0.013, decode the received bits with syndrome decoder, extract the information bits
from the codewords and count the number of errors.
sou 100 | matenc G.15.11 | bsc 0.013 | syndec H.15.11 | xinfo G.15.11 |
check