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 - - | ./ch - - --No -30 --Fs 7500 | ./cohpsk_demod - - | ./cohpsk_put_test_bits - 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 - - | ./ch - - --No -40 -f -20 --Fs 7500 | ./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