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More of 77 bit protocol

oop-decoder
Karlis Goba 2018-10-26 11:43:16 +03:00
rodzic 4bf6772c94
commit fd271eca35
3 zmienionych plików z 281 dodań i 1 usunięć
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encode_91.cpp 100644
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@ -0,0 +1,263 @@
#include "encode.h"
constexpr int N = 174, K = 91, M = N-K; // Define the LDPC sizes
constexpr uint16_t POLYNOMIAL = 0x2757; // CRC-14 polynomial without the leading (MSB) 1
constexpr int K_BYTES = (K + 7) / 8;
// Parity generator matrix for (174,91) LDPC code, stored in bitpacked format (MSB first)
const uint8_t G[M][K_BYTES] = {
{ 0x83, 0x29, 0xce, 0x11, 0xbf, 0x31, 0xea, 0xf5, 0x09, 0xf2, 0x7f, 0xc0 },
{ 0x76, 0x1c, 0x26, 0x4e, 0x25, 0xc2, 0x59, 0x33, 0x54, 0x93, 0x13, 0x20 },
{ 0xdc, 0x26, 0x59, 0x02, 0xfb, 0x27, 0x7c, 0x64, 0x10, 0xa1, 0xbd, 0xc0 },
{ 0x1b, 0x3f, 0x41, 0x78, 0x58, 0xcd, 0x2d, 0xd3, 0x3e, 0xc7, 0xf6, 0x20 },
{ 0x09, 0xfd, 0xa4, 0xfe, 0xe0, 0x41, 0x95, 0xfd, 0x03, 0x47, 0x83, 0xa0 },
{ 0x07, 0x7c, 0xcc, 0xc1, 0x1b, 0x88, 0x73, 0xed, 0x5c, 0x3d, 0x48, 0xa0 },
{ 0x29, 0xb6, 0x2a, 0xfe, 0x3c, 0xa0, 0x36, 0xf4, 0xfe, 0x1a, 0x9d, 0xa0 },
{ 0x60, 0x54, 0xfa, 0xf5, 0xf3, 0x5d, 0x96, 0xd3, 0xb0, 0xc8, 0xc3, 0xe0 },
{ 0xe2, 0x07, 0x98, 0xe4, 0x31, 0x0e, 0xed, 0x27, 0x88, 0x4a, 0xe9, 0x00 },
{ 0x77, 0x5c, 0x9c, 0x08, 0xe8, 0x0e, 0x26, 0xdd, 0xae, 0x56, 0x31, 0x80 },
{ 0xb0, 0xb8, 0x11, 0x02, 0x8c, 0x2b, 0xf9, 0x97, 0x21, 0x34, 0x87, 0xc0 },
{ 0x18, 0xa0, 0xc9, 0x23, 0x1f, 0xc6, 0x0a, 0xdf, 0x5c, 0x5e, 0xa3, 0x20 },
{ 0x76, 0x47, 0x1e, 0x83, 0x02, 0xa0, 0x72, 0x1e, 0x01, 0xb1, 0x2b, 0x80 },
{ 0xff, 0xbc, 0xcb, 0x80, 0xca, 0x83, 0x41, 0xfa, 0xfb, 0x47, 0xb2, 0xe0 },
{ 0x66, 0xa7, 0x2a, 0x15, 0x8f, 0x93, 0x25, 0xa2, 0xbf, 0x67, 0x17, 0x00 },
{ 0xc4, 0x24, 0x36, 0x89, 0xfe, 0x85, 0xb1, 0xc5, 0x13, 0x63, 0xa1, 0x80 },
{ 0x0d, 0xff, 0x73, 0x94, 0x14, 0xd1, 0xa1, 0xb3, 0x4b, 0x1c, 0x27, 0x00 },
{ 0x15, 0xb4, 0x88, 0x30, 0x63, 0x6c, 0x8b, 0x99, 0x89, 0x49, 0x72, 0xe0 },
{ 0x29, 0xa8, 0x9c, 0x0d, 0x3d, 0xe8, 0x1d, 0x66, 0x54, 0x89, 0xb0, 0xe0 },
{ 0x4f, 0x12, 0x6f, 0x37, 0xfa, 0x51, 0xcb, 0xe6, 0x1b, 0xd6, 0xb9, 0x40 },
{ 0x99, 0xc4, 0x72, 0x39, 0xd0, 0xd9, 0x7d, 0x3c, 0x84, 0xe0, 0x94, 0x00 },
{ 0x19, 0x19, 0xb7, 0x51, 0x19, 0x76, 0x56, 0x21, 0xbb, 0x4f, 0x1e, 0x80 },
{ 0x09, 0xdb, 0x12, 0xd7, 0x31, 0xfa, 0xee, 0x0b, 0x86, 0xdf, 0x6b, 0x80 },
{ 0x48, 0x8f, 0xc3, 0x3d, 0xf4, 0x3f, 0xbd, 0xee, 0xa4, 0xea, 0xfb, 0x40 },
{ 0x82, 0x74, 0x23, 0xee, 0x40, 0xb6, 0x75, 0xf7, 0x56, 0xeb, 0x5f, 0xe0 },
{ 0xab, 0xe1, 0x97, 0xc4, 0x84, 0xcb, 0x74, 0x75, 0x71, 0x44, 0xa9, 0xa0 },
{ 0x2b, 0x50, 0x0e, 0x4b, 0xc0, 0xec, 0x5a, 0x6d, 0x2b, 0xdb, 0xdd, 0x00 },
{ 0xc4, 0x74, 0xaa, 0x53, 0xd7, 0x02, 0x18, 0x76, 0x16, 0x69, 0x36, 0x00 },
{ 0x8e, 0xba, 0x1a, 0x13, 0xdb, 0x33, 0x90, 0xbd, 0x67, 0x18, 0xce, 0xc0 },
{ 0x75, 0x38, 0x44, 0x67, 0x3a, 0x27, 0x78, 0x2c, 0xc4, 0x20, 0x12, 0xe0 },
{ 0x06, 0xff, 0x83, 0xa1, 0x45, 0xc3, 0x70, 0x35, 0xa5, 0xc1, 0x26, 0x80 },
{ 0x3b, 0x37, 0x41, 0x78, 0x58, 0xcc, 0x2d, 0xd3, 0x3e, 0xc3, 0xf6, 0x20 },
{ 0x9a, 0x4a, 0x5a, 0x28, 0xee, 0x17, 0xca, 0x9c, 0x32, 0x48, 0x42, 0xc0 },
{ 0xbc, 0x29, 0xf4, 0x65, 0x30, 0x9c, 0x97, 0x7e, 0x89, 0x61, 0x0a, 0x40 },
{ 0x26, 0x63, 0xae, 0x6d, 0xdf, 0x8b, 0x5c, 0xe2, 0xbb, 0x29, 0x48, 0x80 },
{ 0x46, 0xf2, 0x31, 0xef, 0xe4, 0x57, 0x03, 0x4c, 0x18, 0x14, 0x41, 0x80 },
{ 0x3f, 0xb2, 0xce, 0x85, 0xab, 0xe9, 0xb0, 0xc7, 0x2e, 0x06, 0xfb, 0xe0 },
{ 0xde, 0x87, 0x48, 0x1f, 0x28, 0x2c, 0x15, 0x39, 0x71, 0xa0, 0xa2, 0xe0 },
{ 0xfc, 0xd7, 0xcc, 0xf2, 0x3c, 0x69, 0xfa, 0x99, 0xbb, 0xa1, 0x41, 0x20 },
{ 0xf0, 0x26, 0x14, 0x47, 0xe9, 0x49, 0x0c, 0xa8, 0xe4, 0x74, 0xce, 0xc0 },
{ 0x44, 0x10, 0x11, 0x58, 0x18, 0x19, 0x6f, 0x95, 0xcd, 0xd7, 0x01, 0x20 },
{ 0x08, 0x8f, 0xc3, 0x1d, 0xf4, 0xbf, 0xbd, 0xe2, 0xa4, 0xea, 0xfb, 0x40 },
{ 0xb8, 0xfe, 0xf1, 0xb6, 0x30, 0x77, 0x29, 0xfb, 0x0a, 0x07, 0x8c, 0x00 },
{ 0x5a, 0xfe, 0xa7, 0xac, 0xcc, 0xb7, 0x7b, 0xbc, 0x9d, 0x99, 0xa9, 0x00 },
{ 0x49, 0xa7, 0x01, 0x6a, 0xc6, 0x53, 0xf6, 0x5e, 0xcd, 0xc9, 0x07, 0x60 },
{ 0x19, 0x44, 0xd0, 0x85, 0xbe, 0x4e, 0x7d, 0xa8, 0xd6, 0xcc, 0x7d, 0x00 },
{ 0x25, 0x1f, 0x62, 0xad, 0xc4, 0x03, 0x2f, 0x0e, 0xe7, 0x14, 0x00, 0x20 },
{ 0x56, 0x47, 0x1f, 0x87, 0x02, 0xa0, 0x72, 0x1e, 0x00, 0xb1, 0x2b, 0x80 },
{ 0x2b, 0x8e, 0x49, 0x23, 0xf2, 0xdd, 0x51, 0xe2, 0xd5, 0x37, 0xfa, 0x00 },
{ 0x6b, 0x55, 0x0a, 0x40, 0xa6, 0x6f, 0x47, 0x55, 0xde, 0x95, 0xc2, 0x60 },
{ 0xa1, 0x8a, 0xd2, 0x8d, 0x4e, 0x27, 0xfe, 0x92, 0xa4, 0xf6, 0xc8, 0x40 },
{ 0x10, 0xc2, 0xe5, 0x86, 0x38, 0x8c, 0xb8, 0x2a, 0x3d, 0x80, 0x75, 0x80 },
{ 0xef, 0x34, 0xa4, 0x18, 0x17, 0xee, 0x02, 0x13, 0x3d, 0xb2, 0xeb, 0x00 },
{ 0x7e, 0x9c, 0x0c, 0x54, 0x32, 0x5a, 0x9c, 0x15, 0x83, 0x6e, 0x00, 0x00 },
{ 0x36, 0x93, 0xe5, 0x72, 0xd1, 0xfd, 0xe4, 0xcd, 0xf0, 0x79, 0xe8, 0x60 },
{ 0xbf, 0xb2, 0xce, 0xc5, 0xab, 0xe1, 0xb0, 0xc7, 0x2e, 0x07, 0xfb, 0xe0 },
{ 0x7e, 0xe1, 0x82, 0x30, 0xc5, 0x83, 0xcc, 0xcc, 0x57, 0xd4, 0xb0, 0x80 },
{ 0xa0, 0x66, 0xcb, 0x2f, 0xed, 0xaf, 0xc9, 0xf5, 0x26, 0x64, 0x12, 0x60 },
{ 0xbb, 0x23, 0x72, 0x5a, 0xbc, 0x47, 0xcc, 0x5f, 0x4c, 0xc4, 0xcd, 0x20 },
{ 0xde, 0xd9, 0xdb, 0xa3, 0xbe, 0xe4, 0x0c, 0x59, 0xb5, 0x60, 0x9b, 0x40 },
{ 0xd9, 0xa7, 0x01, 0x6a, 0xc6, 0x53, 0xe6, 0xde, 0xcd, 0xc9, 0x03, 0x60 },
{ 0x9a, 0xd4, 0x6a, 0xed, 0x5f, 0x70, 0x7f, 0x28, 0x0a, 0xb5, 0xfc, 0x40 },
{ 0xe5, 0x92, 0x1c, 0x77, 0x82, 0x25, 0x87, 0x31, 0x6d, 0x7d, 0x3c, 0x20 },
{ 0x4f, 0x14, 0xda, 0x82, 0x42, 0xa8, 0xb8, 0x6d, 0xca, 0x73, 0x35, 0x20 },
{ 0x8b, 0x8b, 0x50, 0x7a, 0xd4, 0x67, 0xd4, 0x44, 0x1d, 0xf7, 0x70, 0xe0 },
{ 0x22, 0x83, 0x1c, 0x9c, 0xf1, 0x16, 0x94, 0x67, 0xad, 0x04, 0xb6, 0x80 },
{ 0x21, 0x3b, 0x83, 0x8f, 0xe2, 0xae, 0x54, 0xc3, 0x8e, 0xe7, 0x18, 0x00 },
{ 0x5d, 0x92, 0x6b, 0x6d, 0xd7, 0x1f, 0x08, 0x51, 0x81, 0xa4, 0xe1, 0x20 },
{ 0x66, 0xab, 0x79, 0xd4, 0xb2, 0x9e, 0xe6, 0xe6, 0x95, 0x09, 0xe5, 0x60 },
{ 0x95, 0x81, 0x48, 0x68, 0x2d, 0x74, 0x8a, 0x38, 0xdd, 0x68, 0xba, 0xa0 },
{ 0xb8, 0xce, 0x02, 0x0c, 0xf0, 0x69, 0xc3, 0x2a, 0x72, 0x3a, 0xb1, 0x40 },
{ 0xf4, 0x33, 0x1d, 0x6d, 0x46, 0x16, 0x07, 0xe9, 0x57, 0x52, 0x74, 0x60 },
{ 0x6d, 0xa2, 0x3b, 0xa4, 0x24, 0xb9, 0x59, 0x61, 0x33, 0xcf, 0x9c, 0x80 },
{ 0xa6, 0x36, 0xbc, 0xbc, 0x7b, 0x30, 0xc5, 0xfb, 0xea, 0xe6, 0x7f, 0xe0 },
{ 0x5c, 0xb0, 0xd8, 0x6a, 0x07, 0xdf, 0x65, 0x4a, 0x90, 0x89, 0xa2, 0x00 },
{ 0xf1, 0x1f, 0x10, 0x68, 0x48, 0x78, 0x0f, 0xc9, 0xec, 0xdd, 0x80, 0xa0 },
{ 0x1f, 0xbb, 0x53, 0x64, 0xfb, 0x8d, 0x2c, 0x9d, 0x73, 0x0d, 0x5b, 0xa0 },
{ 0xfc, 0xb8, 0x6b, 0xc7, 0x0a, 0x50, 0xc9, 0xd0, 0x2a, 0x5d, 0x03, 0x40 },
{ 0xa5, 0x34, 0x43, 0x30, 0x29, 0xea, 0xc1, 0x5f, 0x32, 0x2e, 0x34, 0xc0 },
{ 0xc9, 0x89, 0xd9, 0xc7, 0xc3, 0xd3, 0xb8, 0xc5, 0x5d, 0x75, 0x13, 0x00 },
{ 0x7b, 0xb3, 0x8b, 0x2f, 0x01, 0x86, 0xd4, 0x66, 0x43, 0xae, 0x96, 0x20 },
{ 0x26, 0x44, 0xeb, 0xad, 0xeb, 0x44, 0xb9, 0x46, 0x7d, 0x1f, 0x42, 0xc0 },
{ 0x60, 0x8c, 0xc8, 0x57, 0x59, 0x4b, 0xfb, 0xb5, 0x5d, 0x69, 0x60, 0x00 }
};
// Column order (permutation) in which the bits in codeword are stored
const uint8_t colorder[N] = {
0, 1, 2, 3, 30, 4, 5, 6, 7, 8, 9, 10, 11, 32, 12, 40, 13, 14, 15, 16,
17, 18, 37, 45, 29, 19, 20, 21, 41, 22, 42, 31, 33, 34, 44, 35, 47, 51, 50, 43,
36, 52, 63, 46, 25, 55, 27, 24, 23, 53, 39, 49, 59, 38, 48, 61, 60, 57, 28, 62,
56, 58, 65, 66, 26, 70, 64, 69, 68, 67, 74, 71, 54, 76, 72, 75, 78, 77, 80, 79,
73, 83, 84, 81, 82, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,
120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,
140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
160,161,162,163,164,165,166,167,168,169,170,171,172,173
};
// Costas 7x7 tone pattern
const uint8_t ICOS7[] = { 2,5,6,0,4,1,3 };
// Returns 1 if an odd number of bits are set in x, zero otherwise
uint8_t parity8(uint8_t x) {
x ^= x >> 4; // a b c d ae bf cg dh
x ^= x >> 2; // a b ac bd cae dbf aecg bfdh
x ^= x >> 1; // a ab bac acbd bdcae caedbf aecgbfdh
return (x) & 1;
}
// Encode an 87-bit message and return a 174-bit codeword.
// The generator matrix has dimensions (87,87).
// The code is a (174,87) regular ldpc code with column weight 3.
// The code was generated using the PEG algorithm.
// After creating the codeword, the columns are re-ordered according to
// "colorder" to make the codeword compatible with the parity-check matrix
// Arguments:
// [IN] message - array of 87 bits stored as 11 bytes (MSB first)
// [OUT] codeword - array of 174 bits stored as 22 bytes (MSB first)
void encode174(const uint8_t *message, uint8_t *codeword) {
// Here we don't generate the generator bit matrix as in WSJT-X implementation
// Instead we access the generator bits straight from the binary representation in G
// Also we don't use the itmp temporary buffer, instead filling codeword bit by bit
// in the reordered order as we compute the result.
// For reference:
// itmp(1:M)=pchecks
// itmp(M+1:N)=message(1:K)
// codeword(colorder+1)=itmp(1:N)
int colidx = 0; // track the current column in codeword
// Fill the codeword with zeroes, as we will only update binary ones later
for (int i = 0; i < (N + 7) / 8; i++) {
codeword[i] = 0;
}
// Compute the first part of itmp (1:M) and store the result in codeword
for (int i = 0; i < M; ++i) { // do i=1,M
// Fast implementation of bitwise multiplication and parity checking
// Normally nsum would contain the result of dot product between message and G[i],
// but we only compute the sum modulo 2.
uint8_t nsum = 0;
for (int j = 0; j < K_BYTES; ++j) {
uint8_t bits = message[j] & G[i][j]; // bitwise AND (bitwise multiplication)
nsum ^= parity8(bits); // bitwise XOR (addition modulo 2)
}
// Check if we need to set a bit in codeword
if (nsum % 2) { // pchecks(i)=mod(nsum,2)
uint8_t col = colorder[colidx]; // Index of the bit to set
codeword[col/8] |= (1 << (7 - col%8));
}
++colidx;
}
// Compute the second part of itmp (M+1:N) and store the result in codeword
uint8_t mask = 0x80; // Rolling mask starting with the MSB
for (int j = 0; j < K; ++j) {
// Copy the j-th bit from message to codeword
if (message[j/8] & mask) {
uint8_t col = colorder[colidx]; // Index of the bit to set
codeword[col/8] |= (1 << (7 - col%8));
}
++colidx;
// Roll the bitmask to the right
mask >>= 1;
if (mask == 0) mask = 0x80;
}
}
// Compute 14-bit CRC for a sequence of given number of bits
// [IN] message - byte sequence (MSB first)
// [IN] num_bits - number of bits in the sequence
uint16_t ft8_crc(uint8_t *message, int num_bits) {
// Adapted from https://barrgroup.com/Embedded-Systems/How-To/CRC-Calculation-C-Code
constexpr int WIDTH = 14;
constexpr uint16_t TOPBIT = (1 << (WIDTH - 1));
uint16_t remainder = 0;
int idx_byte = 0;
// Perform modulo-2 division, a bit at a time.
for (int idx_bit = 0; idx_bit < num_bits; ++idx_bit) {
if (idx_bit % 8 == 0) {
// Bring the next byte into the remainder.
remainder ^= (message[idx_byte] << (WIDTH - 8));
++idx_byte;
}
// Try to divide the current data bit.
if (remainder & TOPBIT) {
remainder = (remainder << 1) ^ POLYNOMIAL;
}
else {
remainder = (remainder << 1);
}
}
return remainder & ((1 << WIDTH) - 1);
}
// Generate FT8 tone sequence from payload data
// [IN] payload - 9 byte array consisting of 72 bit payload (MSB first)
// [IN] i3 - 3 bits containing message type (zero?)
// [OUT] itone - array of NN (79) bytes to store the generated tones (encoded as 0..7)
void genft8(const uint8_t *payload, uint8_t i3, uint8_t *itone) {
uint8_t a91[12]; // Store 77 bits of payload + 14 bits CRC
// Copy 77 bits of payload data
for (int i = 0; i < 10; i++)
a91[i] = payload[i];
// Clear 3 bits after the payload to make 80 bits
a91[9] &= 0xF8;
// Calculate CRC of 80 bits (yes, 77 + 3 zero bits), see WSJT-X code
uint16_t checksum = ft8_crc(a91, 80);
// Store the CRC at the end of 77 bit message
a91[9] |= (uint8_t)(checksum >> 11);
a91[10] = (uint8_t)(checksum >> 3);
// a87 contains 72 bits of payload + 3 bits of i3 + 12 bits of CRC
uint8_t codeword[22];
encode174(a91, codeword);
// Message structure: S7 D29 S7 D29 S7
for (int i = 0; i < 7; ++i) {
itone[i] = ICOS7[i];
itone[36 + i] = ICOS7[i];
itone[72 + i] = ICOS7[i];
}
int k = 7; // Skip over the first set of Costas symbols
for (int j = 0; j < ND; ++j) { // do j=1,ND
if (j == 29) {
k += 7; // Skip over the second set of Costas symbols
}
// Extract 3 bits from codeword at i-th position
itone[k] = 0;
int i = 3*j;
if (codeword[i/8] & (1 << (7 - i%8))) itone[k] |= 4;
++i;
if (codeword[i/8] & (1 << (7 - i%8))) itone[k] |= 2;
++i;
if (codeword[i/8] & (1 << (7 - i%8))) itone[k] |= 1;
++k;
}
}

9
pack77.cpp → pack_77.cpp
Wyświetl plik

@ -119,12 +119,19 @@ void pack77_1(const char *msg, uint8_t i3, uint8_t *b77) {
// if(index(w(1),'/P').ge.4 .or. index(w(1),'/R').ge.4) ipa=1
// if(index(w(2),'/P').ge.4 .or. index(w(2),'/R').ge.4) ipb=1
uint32_t n28a, n28b;
int32_t n28a, n28b;
uint16_t igrid4;
const char *call1, *call2;
n28a = pack28(call1);
n28b = pack28(call2);
// Add ipa and ipb bits to the right
n28a <<= 1; // ipa = 0
n28b <<= 1; // ipb = 0
// Add igrid4 bit to the left
//igrid4 |= 0x8000; // ir = 1
// write(c77,1000) n28a,ipa,n28b,ipb,ir,igrid4,i3

10
utils/convert_generator.py
Wyświetl plik

@ -1,6 +1,16 @@
import sys
import re
rx1 = re.compile(r'"([0-9a-z]+)"', re.I)
for line in sys.stdin:
line = line.strip()
m = rx1.search(line)
if m == None:
continue
line = m.group(1)
if len(line) % 2 == 1:
line += '0'
b = ['0x' + line[i*2:i*2+2] for i in range(len(line)/2)]
print '{ %s },' % (', '.join(b))