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Add the detailed processing for the FACCH1 and UDCH.

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This commit is contained in:
Jonathan Naylor
2018-01-29 21:41:14 +00:00
parent bf88e48ed9
commit 6d3973d413
4 changed files with 242 additions and 12 deletions
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111
NXDNFACCH1.cpp
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@@ -28,6 +28,22 @@
#include <cassert>
#include <cstring>
const unsigned int INTERLEAVE_TABLE[] = {
0U, 9U, 18U, 27U, 36U, 45U, 54U, 63U, 72U, 81U, 90U, 99U, 108U, 117U, 126U, 135U,
1U, 10U, 19U, 28U, 37U, 46U, 55U, 64U, 73U, 82U, 91U, 100U, 109U, 118U, 127U, 136U,
2U, 11U, 20U, 29U, 38U, 47U, 56U, 65U, 74U, 83U, 92U, 101U, 110U, 119U, 128U, 137U,
3U, 12U, 21U, 30U, 39U, 48U, 57U, 66U, 75U, 84U, 93U, 102U, 111U, 120U, 129U, 138U,
4U, 13U, 22U, 31U, 40U, 49U, 58U, 67U, 76U, 85U, 94U, 103U, 112U, 121U, 130U, 139U,
5U, 14U, 23U, 32U, 41U, 50U, 59U, 68U, 77U, 86U, 95U, 104U, 113U, 122U, 131U, 140U,
6U, 15U, 24U, 33U, 42U, 51U, 60U, 69U, 78U, 87U, 96U, 105U, 114U, 123U, 132U, 141U,
7U, 16U, 25U, 34U, 43U, 52U, 61U, 70U, 79U, 88U, 97U, 106U, 115U, 124U, 133U, 142U,
8U, 17U, 26U, 35U, 44U, 53U, 62U, 71U, 80U, 89U, 98U, 107U, 116U, 125U, 134U, 143U };
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};
const unsigned char BIT_MASK_TABLE[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U };
#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
@@ -51,16 +67,105 @@ CNXDNFACCH1::~CNXDNFACCH1()
delete[] m_data;
}
bool CNXDNFACCH1::decode(const unsigned char* data)
bool CNXDNFACCH1::decode(const unsigned char* data, unsigned int offset)
{
assert(data != NULL);
return true;
CUtils::dump("NXDN, FACCH1 input", data, 18U);
unsigned char temp1[18U];
for (unsigned int i = 0U; i < NXDN_FACCH1_LENGTH_BITS; i++) {
unsigned int n = INTERLEAVE_TABLE[i] + offset;
bool b = READ_BIT1(data, n);
WRITE_BIT1(temp1, i, b);
}
CUtils::dump("NXDN, FACCH1 de-interleaved", temp1, 18U);
uint8_t temp2[192U];
char text[500U];
::strcpy(text, "NXDN, FACCH1 de-punctured: ");
unsigned int n = 0U;
unsigned int index = 0U;
for (unsigned int i = 0U; i < NXDN_FACCH1_LENGTH_BITS; i++) {
if (n == PUNCTURE_LIST[index]) {
::strcat(text, "X, ");
temp2[n++] = 99U;
index++;
}
bool b = READ_BIT1(temp1, i);
temp2[n++] = b ? 1U : 0U;
::strcat(text, b ? "1, " : "0, ");
}
LogMessage(text);
CNXDNConvolution conv;
conv.start();
n = 0U;
for (unsigned int i = 0U; i < 96U; i++) {
uint8_t s0 = temp2[n++];
uint8_t s1 = temp2[n++];
conv.decode(s0, s1);
}
conv.chainback(m_data, 92U);
CUtils::dump("NXDN, FACCH1 decoded", m_data, 12U);
return CNXDNCRC::checkCRC12(m_data, 80U);
}
void CNXDNFACCH1::encode(unsigned char* data) const
void CNXDNFACCH1::encode(unsigned char* data, unsigned int offset) const
{
assert(data != NULL);
unsigned char temp1[12U];
::memset(temp1, 0x00U, 12U);
for (unsigned int i = 0U; i < 80U; i++) {
bool b = READ_BIT1(m_data, i);
WRITE_BIT1(temp1, i, b);
}
CNXDNCRC::encodeCRC12(temp1, 80U);
CUtils::dump("NXDN, FACCH1 encoded with CRC", temp1, 12U);
unsigned char temp2[24U];
CNXDNConvolution conv;
conv.encode(temp1, temp2, 96U);
CUtils::dump("NXDN, FACCH1 convolved", temp2, 24U);
unsigned char temp3[18U];
unsigned int n = 0U;
unsigned int index = 0U;
for (unsigned int i = 0U; i < 192U; i++) {
if (i != PUNCTURE_LIST[index]) {
bool b = READ_BIT1(temp2, i);
WRITE_BIT1(temp3, n, b);
n++;
} else {
index++;
}
}
CUtils::dump("NXDN, FACCH1 punctured", temp3, 18U);
for (unsigned int i = 0U; i < NXDN_FACCH1_LENGTH_BITS; i++) {
unsigned int n = INTERLEAVE_TABLE[i] + offset;
bool b = READ_BIT1(temp3, i);
WRITE_BIT1(data, n, b);
}
}
void CNXDNFACCH1::getData(unsigned char* data) const