mirror of
https://github.com/aicodix/modem.git
synced 2026-04-27 22:35:41 +00:00
added mode 14 for short messages
using SPC(2048, 1392), QPSK, 1600 Hz BW and about 1 second long
This commit is contained in:
Ahmet Inan
parent
16e495ab9c
commit
41795780cb
5 changed files with 62 additions and 304 deletions
171
encode.cc
171
encode.cc
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@ -27,10 +27,16 @@ template <typename value, typename cmplx, int rate>
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struct Encoder
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{
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typedef int8_t code_type;
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static const int oper_mode = 14;
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static const int mod_bits = 2;
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static const int code_order = 11;
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static const int code_len = 1 << code_order;
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static const int symbol_len = (1280 * rate) / 8000;
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static const int guard_len = symbol_len / 8;
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static const int data_bits = 43040;
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static const int data_bits = 1360;
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static const int crc_bits = data_bits + 32;
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static const int cons_cols = 256;
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static const int cons_rows = 4;
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static const int mls0_len = 127;
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static const int mls0_poly = 0b10001001;
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static const int mls1_len = 255;
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@ -44,21 +50,12 @@ struct Encoder
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CODE::CRC<uint32_t> crc1;
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CODE::BoseChaudhuriHocquenghemEncoder<255, 71> bchenc;
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CODE::PolarSysEnc<code_type> polarenc;
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code_type code[65536], mesg[44096];
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code_type code[code_len], mesg[crc_bits];
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cmplx fdom[symbol_len], fdom4[4*symbol_len];
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cmplx tdom[symbol_len], tdom4[4*symbol_len];
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cmplx temp[symbol_len];
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cmplx guard[guard_len];
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cmplx papr_min, papr_max;
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const uint32_t *frozen_bits;
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int code_order;
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int oper_mode;
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int mod_bits;
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int cons_cnt;
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int cons_cols;
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int cons_rows;
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int cons_bits;
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int mesg_bits;
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int code_off;
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int mls0_off;
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int mls1_off;
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@ -175,109 +172,19 @@ struct Encoder
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fdom[bin(i+mls1_off)] *= nrz(seq4());
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symbol();
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}
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void shorten()
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{
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int code_bits = 1 << code_order;
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for (int i = 0, j = 0, k = 0; i < code_bits; ++i)
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if ((frozen_bits[i/32] >> (i%32)) & 1 || k++ < crc_bits)
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code[j++] = code[i];
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}
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cmplx mod_map(code_type *b)
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{
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switch (mod_bits) {
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case 2:
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return PhaseShiftKeying<4, cmplx, code_type>::map(b);
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case 3:
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return PhaseShiftKeying<8, cmplx, code_type>::map(b);
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}
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return 0;
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return PhaseShiftKeying<4, cmplx, code_type>::map(b);
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}
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bool prepare()
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{
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switch (oper_mode) {
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case 6:
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cons_cols = 432;
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mod_bits = 3;
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code_order = 16;
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cons_bits = 64800;
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mesg_bits = 43808;
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frozen_bits = frozen_64800_43072;
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break;
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case 7:
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cons_cols = 400;
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mod_bits = 3;
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code_order = 16;
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cons_bits = 64800;
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mesg_bits = 43808;
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frozen_bits = frozen_64800_43072;
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break;
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case 8:
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cons_cols = 400;
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mod_bits = 2;
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code_order = 16;
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cons_bits = 64800;
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mesg_bits = 43808;
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frozen_bits = frozen_64800_43072;
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break;
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case 9:
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cons_cols = 360;
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mod_bits = 2;
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code_order = 16;
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cons_bits = 64800;
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mesg_bits = 43808;
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frozen_bits = frozen_64800_43072;
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break;
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case 10:
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cons_cols = 512;
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mod_bits = 3;
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code_order = 16;
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cons_bits = 64512;
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mesg_bits = 44096;
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frozen_bits = frozen_64512_43072;
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break;
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case 11:
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cons_cols = 384;
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mod_bits = 3;
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code_order = 16;
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cons_bits = 64512;
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mesg_bits = 44096;
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frozen_bits = frozen_64512_43072;
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break;
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case 12:
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cons_cols = 384;
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mod_bits = 2;
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code_order = 16;
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cons_bits = 64512;
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mesg_bits = 44096;
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frozen_bits = frozen_64512_43072;
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break;
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case 13:
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cons_cols = 256;
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mod_bits = 2;
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code_order = 16;
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cons_bits = 64512;
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mesg_bits = 44096;
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frozen_bits = frozen_64512_43072;
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break;
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default:
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return false;
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}
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cons_cnt = cons_bits / mod_bits;
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cons_rows = cons_cnt / cons_cols;
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return true;
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}
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Encoder(DSP::WritePCM<value> *pcm, const uint8_t *inp, int freq_off, uint64_t call_sign, int oper_mode) :
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pcm(pcm), crc0(0xA8F4), crc1(0xD419CC15), bchenc({
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Encoder(DSP::WritePCM<value> *pcm, const uint8_t *inp, int freq_off, uint64_t call_sign) :
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pcm(pcm), crc0(0xA8F4), crc1(0x8F6E37A0), bchenc({
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0b100011101, 0b101110111, 0b111110011, 0b101101001,
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0b110111101, 0b111100111, 0b100101011, 0b111010111,
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0b000010011, 0b101100101, 0b110001011, 0b101100011,
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0b100011011, 0b100111111, 0b110001101, 0b100101101,
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0b101011111, 0b111111001, 0b111000011, 0b100111001,
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0b110101001, 0b000011111, 0b110000111, 0b110110001}),
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oper_mode(oper_mode)
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0b110101001, 0b000011111, 0b110000111, 0b110110001})
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{
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if (!prepare())
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return;
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int offset = (freq_off * symbol_len) / rate;
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code_off = offset - cons_cols / 2;
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mls0_off = offset - mls0_len + 1;
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@ -286,7 +193,6 @@ struct Encoder
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pilot_block();
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schmidl_cox();
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meta_data((call_sign << 8) | oper_mode);
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pilot_block();
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for (int i = 0; i < data_bits; ++i)
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mesg[i] = nrz(CODE::get_le_bit(inp, i));
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crc1.reset();
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@ -294,10 +200,7 @@ struct Encoder
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crc1(inp[i]);
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for (int i = 0; i < 32; ++i)
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mesg[i+data_bits] = nrz((crc1()>>i)&1);
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for (int i = crc_bits; i < mesg_bits; ++i)
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mesg[i] = 1;
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polarenc(code, mesg, frozen_bits, code_order);
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shorten();
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polarenc(code, mesg, frozen_2048_1392, code_order);
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for (int j = 0; j < cons_rows; ++j) {
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for (int i = 0; i < cons_cols; ++i)
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fdom[bin(i+code_off)] *=
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@ -332,8 +235,8 @@ long long int base37_encoder(const char *str)
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int main(int argc, char **argv)
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{
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if (argc < 6 || argc > 9) {
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std::cerr << "usage: " << argv[0] << " OUTPUT RATE BITS CHANNELS INPUT [OFFSET] [CALLSIGN] [MODE]" << std::endl;
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if (argc < 6 || argc > 8) {
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std::cerr << "usage: " << argv[0] << " OUTPUT RATE BITS CHANNELS INPUT [OFFSET] [CALLSIGN]" << std::endl;
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return 1;
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}
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@ -360,39 +263,7 @@ int main(int argc, char **argv)
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return 1;
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}
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int oper_mode = 6;
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if (argc >= 9)
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oper_mode = std::atoi(argv[8]);
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if (oper_mode < 6 || oper_mode > 13) {
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std::cerr << "Unsupported operation mode." << std::endl;
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return 1;
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}
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int band_width;
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switch (oper_mode) {
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case 6:
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band_width = 2700;
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break;
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case 7:
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case 8:
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band_width = 2500;
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break;
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case 9:
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band_width = 2250;
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break;
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case 10:
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band_width = 3200;
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break;
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case 11:
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case 12:
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band_width = 2400;
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break;
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case 13:
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band_width = 1600;
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break;
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default:
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return 1;
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}
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const int band_width = 1600;
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if ((output_chan == 1 && freq_off < band_width / 2) || freq_off < band_width / 2 - output_rate / 2 || freq_off > output_rate / 2 - band_width / 2) {
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std::cerr << "Unsupported frequency offset." << std::endl;
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@ -412,7 +283,7 @@ int main(int argc, char **argv)
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std::cerr << "Couldn't open file \"" << input_name << "\" for reading." << std::endl;
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return 1;
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}
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const int data_len = 43040 / 8;
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const int data_len = 1360 / 8;
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uint8_t *input_data = new uint8_t[data_len];
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for (int i = 0; i < data_len; ++i)
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input_data[i] = input_file.get();
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@ -424,16 +295,16 @@ int main(int argc, char **argv)
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output_file.silence(output_rate);
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switch (output_rate) {
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case 8000:
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delete new Encoder<value, cmplx, 8000>(&output_file, input_data, freq_off, call_sign, oper_mode);
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delete new Encoder<value, cmplx, 8000>(&output_file, input_data, freq_off, call_sign);
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break;
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case 16000:
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delete new Encoder<value, cmplx, 16000>(&output_file, input_data, freq_off, call_sign, oper_mode);
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delete new Encoder<value, cmplx, 16000>(&output_file, input_data, freq_off, call_sign);
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break;
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case 44100:
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delete new Encoder<value, cmplx, 44100>(&output_file, input_data, freq_off, call_sign, oper_mode);
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delete new Encoder<value, cmplx, 44100>(&output_file, input_data, freq_off, call_sign);
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break;
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case 48000:
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delete new Encoder<value, cmplx, 48000>(&output_file, input_data, freq_off, call_sign, oper_mode);
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delete new Encoder<value, cmplx, 48000>(&output_file, input_data, freq_off, call_sign);
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break;
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default:
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std::cerr << "Unsupported sample rate." << std::endl;
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