5 Jun
2012
5 Jun
'12
10:13 a.m.
Hi：
I am studying the tch code, and want to decode the Convolutional code
of TCH using
xcch.c; and how to set the parameters;
1. conv_xcch_next_output
2. conv_xcch_next_state
3. N = 2,
4. K = 5,
static const uint8_t conv_xcch_next_output[][2] = {
{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
};
static const uint8_t conv_xcch_next_state[][2] = {
{ 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 },
{ 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
{ 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 },
{ 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
};
const struct osmo_conv_code conv_xcch = {
.N = 2,
.K = 5,
.len = 224,
.next_output = conv_xcch_next_output,
.next_state = conv_xcch_next_state,
};
Thanks!