codec2_talkie/libcodec2-android/src/codec2/README_cohpsk.md

README_cohpsk.md

Introduction

Quickstart

1. BER test in AWGN channel with just less that 2% average bit error rate:

    $ ./cohpsk_get_test_bits - 5600 | ./cohpsk_mod - - | ./cohpsk_ch - - -30 | ./cohpsk_demod - - | ./cohpsk_put_test_bits -
    <snip>
    SNR3k(dB):  3.41 C/No: 38.2 PAPR:  8.1 
    BER: 0.017 Nbits: 5264 Nerrors: 92
   
   

2. Plot some of the demod internal states, used to chase down freq offset problemL

$ cd build_linux/src
$ ./cohpsk_get_test_bits - 5600 | ./cohpsk_mod - -  | ./cohpsk_ch - - -40 -f -20 | ./cohpsk_demod -o cohpsk_demod.txt - - | ./cohpsk_put_test_bits -
$ cd ../../octave
$ octave --no-gui
$ cohpsk_demod_plot("../build_linux/src/cohpsk_demod.txt")    

3. Run Octave<-> tests

$ cd ~/codec2/build_linux/unittest $ ./tochpsk $ cd ~/codec2/octave $ octave --no-gui octave> tcohpsk

## References

## C Code

## Octave Scripts