Hi Tom and all,
After a quick look at the 4th patch, related to your optimized
Viterbi decoder, I have noticed that currently the convolutional
code definitions from the 'src/gsm/gsm0503_conv.c' are out of
the 'tests/conv' test coverage...
So, I would like to extend the test coverage. All I need are
the test vectors, which I'll add to existing ones. Some of them
I already found in your 4th patch, but some pending I need to
write myself.
Right now I have a simple question...
Let's look at one example:
{
.name = "GSM RACH (non-recursive, flushed, not punctured)",
.code = &gsm_conv_rach,
.in_len = 14,
.out_len = 36, // ???
.has_vec = 0,
.vec_in = { },
.vec_out = { },
}
As I noticed, the 'in_len' may be taken from the code definition:
const struct osmo_conv_code gsm0503_rach = {
.N = 2,
.K = 5,
.len = 14, // The 'in_len' is here!
.next_output = xcch_output,
.next_state = xcch_state,
};
But I don't know how to calculate the 'out_len'...
Could you please give me some hint?
I already started to work on your 4th patch:
https://gerrit.osmocom.org/1542
https://gerrit.osmocom.org/1543
With best regards,
Vadim Yanitskiy.