kopia lustrzana https://github.com/N0BOY/FT8CN
90 wiersze
3.9 KiB
C
90 wiersze
3.9 KiB
C
#ifndef _INCLUDE_CONSTANTS_H_
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#define _INCLUDE_CONSTANTS_H_
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#include <stdint.h>
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#include <time.h>
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typedef enum
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{
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PROTO_FT4,
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PROTO_FT8
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} ftx_protocol_t;
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#define kMin_score (10) /// 候选人的最低同步分数阈值。Minimum sync score threshold for candidates
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#define FT8_SAMPLE_RATE (12000)//采样率
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#define FT8_SYMBOL_PERIOD (0.160f) ///< FT8 symbol duration, defines tone deviation in Hz and symbol rate
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#define FT8_SLOT_TIME (15.0f) ///< FT8 slot period
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#define FT4_SYMBOL_PERIOD (0.048f) ///< FT4 symbol duration, defines tone deviation in Hz and symbol rate
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#define FT4_SLOT_TIME (7.5f) ///< FT4 slot period
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// Define FT8 symbol counts
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// FT8 message structure:
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// S D1 S D2 S
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// S - sync block (7 symbols of Costas pattern)
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// D1 - first data block (29 symbols each encoding 3 bits)
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#define FT8_ND (58) ///< Data symbols
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#define FT8_NN (79) ///< Total channel symbols (FT8_NS + FT8_ND)
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#define FT8_LENGTH_SYNC (7) ///< Length of each sync group
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#define FT8_NUM_SYNC (3) ///< Number of sync groups
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#define FT8_SYNC_OFFSET (36) ///< Offset between sync groups
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#define FT8_SYMBOL_BT (2.0f)
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// Define FT4 symbol counts
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// FT4 message structure:
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// R Sa D1 Sb D2 Sc D3 Sd R
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// R - ramping symbol (no payload information conveyed)
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// Sx - one of four _different_ sync blocks (4 symbols of Costas pattern)
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// Dy - data block (29 symbols each encoding 2 bits)
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#define FT4_ND (87) ///< Data symbols
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#define FT4_NR (2) ///< Ramp symbols (beginning + end)
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#define FT4_NN (105) ///< Total channel symbols (FT4_NS + FT4_ND + FT4_NR)
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#define FT4_LENGTH_SYNC (4) ///< Length of each sync group
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#define FT4_NUM_SYNC (4) ///< Number of sync groups
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#define FT4_SYNC_OFFSET (33) ///< Offset between sync groups
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// Define LDPC parameters
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#define FTX_LDPC_N (174) ///编码消息中的位数（LDPC校验和位的有效负载）< Number of bits in the encoded message (payload with LDPC checksum bits)
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#define FTX_LDPC_K (91) ///< 有效负载位数（包括CRC）Number of payload bits (including CRC)
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#define FTX_LDPC_M (83) ///< Number of LDPC checksum bits (FTX_LDPC_N - FTX_LDPC_K)
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#define FTX_LDPC_N_BYTES ((FTX_LDPC_N + 7) / 8) ///< Number of whole bytes needed to store 174 bits (full message)
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#define FTX_LDPC_K_BYTES ((FTX_LDPC_K + 7) / 8) ///< 存储91位所需的整字节数（仅限有效负载+CRC）Number of whole bytes needed to store 91 bits (payload + CRC only)
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// Define CRC parameters
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#define FT8_CRC_POLYNOMIAL ((uint16_t)0x2757u) ///< CRC-14 polynomial without the leading (MSB) 1
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#define FT8_CRC_WIDTH (14)
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#define DECODE_TIME_OUT (1) ///解码迭代时间超时（秒）
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/// Costas 7x7 tone pattern for synchronization
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extern const uint8_t kFT8CostasPattern[7];
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extern const uint8_t kFT4CostasPattern[4][4];
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/// Gray code map to encode 8 symbols (tones)
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extern const uint8_t kFT8GrayMap[8];
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extern const uint8_t kFT4GrayMap[4];
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extern const uint8_t kFT4XORSequence[10];
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/// Parity generator matrix for (174,91) LDPC code, stored in bitpacked format (MSB first)
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extern const uint8_t kFTXLDPCGenerator[FTX_LDPC_M][FTX_LDPC_K_BYTES];
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/// LDPC(174,91) parity check matrix, containing 83 rows,
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/// each row describes one parity check,
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/// each number is an index into the codeword (1-origin).
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/// The codeword bits mentioned in each row must xor to zero.
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/// From WSJT-X's ldpc_174_91_c_reordered_parity.f90.
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extern const uint8_t kFTX_LDPC_Nm[FTX_LDPC_M][7];
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/// Mn from WSJT-X's bpdecode174.f90. Each row corresponds to a codeword bit.
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/// The numbers indicate which three parity checks (rows in Nm) refer to the codeword bit.
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/// The numbers use 1 as the origin (first entry).
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extern const uint8_t kFTX_LDPC_Mn[FTX_LDPC_N][3];
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/// Number of rows (columns in C/C++) in the array Nm.
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extern const uint8_t kFTX_LDPCNumRows[FTX_LDPC_M];
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#endif // _INCLUDE_CONSTANTS_H_
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