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Adding tail bits to improve Viterbi decoding + puncture lists fix

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juribeparada
2018-02-01 16:05:36 -03:00
parent 885562539e
commit d4fbc8f7ec
3 changed files with 28 additions and 14 deletions
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13
NXDNFACCH1.cpp
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@@ -42,7 +42,8 @@ const unsigned int INTERLEAVE_TABLE[] = {
const unsigned int PUNCTURE_LIST[] = { 1U, 5U, 9U, 13U, 17U, 21U, 25U, 29U, 33U, 37U,
41U, 45U, 49U, 53U, 57U, 61U, 65U, 69U, 73U, 77U,
81U, 85U, 89U, 93U, 97U, 101U, 105U, 109U, 113U, 117U,
121U, 125U, 129U, 133U, 137U, 141U};
121U, 125U, 129U, 133U, 137U, 141U, 145U, 149U, 153U, 157U,
161U, 165U, 169U, 173U, 177U, 181U, 185U, 189U };
const unsigned char BIT_MASK_TABLE[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U };
@@ -83,7 +84,7 @@ bool CNXDNFACCH1::decode(const unsigned char* data, unsigned int offset)
// CUtils::dump("NXDN, FACCH1 de-interleaved", temp1, 18U);
uint8_t temp2[192U];
uint8_t temp2[210U];
unsigned int n = 0U;
unsigned int index = 0U;
@@ -97,18 +98,22 @@ bool CNXDNFACCH1::decode(const unsigned char* data, unsigned int offset)
temp2[n++] = b ? 2U : 0U;
}
for (unsigned int i = 0U; i < 8U; i++) {
temp2[n++] = 0U;
}
CNXDNConvolution conv;
conv.start();
n = 0U;
for (unsigned int i = 0U; i < 96U; i++) {
for (unsigned int i = 0U; i < 100U; i++) {
uint8_t s0 = temp2[n++];
uint8_t s1 = temp2[n++];
conv.decode(s0, s1);
}
conv.chainback(m_data, 92U);
conv.chainback(m_data, 96U);
CUtils::dump("NXDN, FACCH1 decoded", m_data, 12U);