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Quick start:

Create fileuncoded.dat with43040 bits of random data:

dd if=/dev/urandom of=uncoded.dat bs=1 count=5380

Encode fileuncoded.dat toencoded.wavWAV audio file with 8000 Hz sample rate, 16 bits and only 1 (real) channel:

./encode encoded.wav 8000 16 1 2000 6 CALLSIGN uncoded.dat

Start recording torecorded.wav audio file and stop after 20 seconds:

arecord -c 1 -f S16_LE -r 8000 -d 20 recorded.wav

Start playingencoded.wav audio file:

aplay encoded.wav

Decoderecorded.wav audio file todecoded.dat file:

./decode decoded.dat recorded.wav

Compare originaluncoded.dat withdecoded.dat:

diff -s uncoded.dat decoded.dat

Prerequisite:disorders

Encodeuncoded.dat toanalytic audio signal, addmultipath,CFO, SFO,AWGN, decode and compare:

./encode - 8000 16 2 2000 6 CALLSIGN uncoded.dat | ../disorders/multipath - - ../disorders/multipath.txt 10 | ../disorders/cfo - - 234.567 | ../disorders/sfo - - 147 | ../disorders/awgn - - -30 | ./decode - - | diff -s uncoded.dat -

• Robust frequency and timing synchronization for OFDM
  by Timothy M. Schmidl and Donald C. Cox - 1997
• On Timing Offset Estimation for OFDM Systems
  by H. Minn, M. Zeng, and V. K. Bhargava - 2000