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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| /* | ||
| * (C) 2019, Graham J Norbury | ||
| * gnorbury@bondcar.com | ||
| * | ||
| * Stand-alone utility to calculate bit error ratio of a binary dibit capture file | ||
| * compared to an APCO P25 pattern file | ||
| * | ||
| */ | ||
|
|
||
| #include <stdio.h> | ||
| #include <stdint.h> | ||
| #include <fstream> | ||
| #include <vector> | ||
|
|
||
| #include "frame_sync_magics.h" | ||
|
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| typedef std::vector<uint8_t> byte_vector; | ||
|
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||
| static const int FRAME_SIZE = 1728; | ||
| static const int SYNC_SIZE = 48; | ||
| static const unsigned int SYNC_THRESHOLD = 4; | ||
|
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| bool test_sync(uint64_t cw, int &errs) { | ||
| int popcnt = 0; | ||
| popcnt = __builtin_popcountll(cw ^ P25_FRAME_SYNC_MAGIC); | ||
| if (popcnt <= SYNC_THRESHOLD) { | ||
| errs = popcnt; | ||
| return true; | ||
| } | ||
|
|
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| return false; | ||
| } | ||
|
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| int main (int argc, char* argv[]) { | ||
| char dibit; | ||
| uint64_t cw = 0; | ||
| int s_errs = 0; | ||
| byte_vector pattern; | ||
| byte_vector rx_syms; | ||
|
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| if (argc != 3) { | ||
| fprintf(stderr, "Usage: BER <pattern> <filename>\n"); | ||
| return 1; | ||
| } | ||
|
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| // read in pattern file | ||
| pattern.clear(); | ||
| std::fstream p_file(argv[1], std::ios::in | std::ios::binary); | ||
| if ( (p_file.rdstate() & std::ifstream::failbit ) != 0 ) { | ||
| printf("Error opening pattern file: %s\n", argv[1]); | ||
| return 1; | ||
| } | ||
| while (!p_file.eof()) { | ||
| p_file.read((&dibit), 1); | ||
| pattern.push_back((dibit >> 1) & 0x1); | ||
| pattern.push_back(dibit & 0x1); | ||
| } | ||
|
|
||
| // read in received symbols file | ||
| rx_syms.clear(); | ||
| std::fstream r_file(argv[2], std::ios::in | std::ios::binary); | ||
| if ( (r_file.rdstate() & std::ifstream::failbit ) != 0 ) { | ||
| printf("Error opening symbol file: %s\n", argv[2]); | ||
| return 1; | ||
| } | ||
| while (!r_file.eof()) { | ||
| r_file.read((&dibit), 1); | ||
| rx_syms.push_back((dibit >> 1) & 0x1); | ||
| rx_syms.push_back(dibit & 0x1); | ||
| } | ||
|
|
||
| // find starting sync in pattern file | ||
| size_t p_pos = 0; | ||
| size_t p_start = 0; | ||
| int cw_bits = 0; | ||
| while (p_pos < pattern.size()) { | ||
| cw_bits++; | ||
| cw = ((cw << 1) + pattern[p_pos]) & 0xffffffffffff; | ||
| if ((cw_bits >= SYNC_SIZE) && test_sync(cw, s_errs)) { | ||
| p_start = p_pos - SYNC_SIZE + 1; | ||
| printf("Pattern sync at %lu, errs %d\n", p_start, s_errs); | ||
| break; | ||
| } | ||
| p_pos++; | ||
| } | ||
| if (p_pos >= pattern.size()) { | ||
| printf("Error: no sync found in pattern file\n"); | ||
| return 1; | ||
| } | ||
|
|
||
| // pattern ichunk must be an even multiple of frame size | ||
| size_t p_len = pattern.size() - p_start; | ||
| if (p_len % FRAME_SIZE) | ||
| p_len -= (p_len % FRAME_SIZE); | ||
| printf("Pattern length: %lu bits\n", p_len); | ||
| printf("Symbols file: %lu bits\n", rx_syms.size()); | ||
|
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| size_t r_pos = 0; | ||
| size_t r_start = 0; | ||
| size_t r_len = rx_syms.size(); | ||
| bool calculating = true; | ||
|
|
||
| // stats | ||
| size_t total_bit_errs = 0; | ||
| size_t total_bit_count = 0; | ||
| double total_ber = 0; | ||
| size_t max_bit_errs = 0; | ||
| size_t max_bit_count = 0; | ||
| double max_ber = 0; | ||
|
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| // run through received symbols chunk by chunk | ||
| do { | ||
| size_t chunk_bit_errs = 0; | ||
| size_t chunk_bit_count = 0; | ||
| double chunk_ber = 0; | ||
|
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| // find next sync in symbols file | ||
| cw = 0; | ||
| cw_bits = 0; | ||
| while (r_pos < r_len) { | ||
| cw_bits++; | ||
| cw = ((cw << 1) + rx_syms[r_pos]) & 0xffffffffffff; | ||
| if ((cw_bits >= SYNC_SIZE) && test_sync(cw, s_errs)) { | ||
| r_start = r_pos - SYNC_SIZE + 1; | ||
| break; | ||
| } | ||
| r_pos++; | ||
| } | ||
| if ((r_pos >= r_len) || (p_len > (r_len - r_start))) { | ||
| calculating = false; | ||
| break; | ||
| } | ||
|
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| r_pos = r_start; | ||
| p_pos = p_start; | ||
| while(p_pos < p_len) { | ||
| if (rx_syms[r_pos] ^ pattern[p_pos]) | ||
| chunk_bit_errs++; | ||
| r_pos++; | ||
| p_pos++; | ||
| chunk_bit_count++; | ||
| } | ||
| chunk_ber = 100 * (double)chunk_bit_errs / (double)chunk_bit_count; | ||
| printf("Pattern match (%lu) bit errs=%lu, BER=%lf%%\n", r_start, chunk_bit_errs, chunk_ber); | ||
| // Check for excessive BER and attempt to resync | ||
| // usually this means pattern and capture file got out of step with each other | ||
| if (chunk_ber > 5) { | ||
| printf("High BER >5.0 detected. Discarding current frame and attempting resync.\n"); | ||
| r_pos = r_start + 2; | ||
| continue; | ||
| } | ||
|
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| // Update totals | ||
| total_bit_count += chunk_bit_count; | ||
| total_bit_errs += chunk_bit_errs; | ||
| if (chunk_ber > max_ber) { | ||
| max_bit_errs = chunk_bit_errs; | ||
| max_bit_count = chunk_bit_count; | ||
| max_ber = chunk_ber; | ||
| } | ||
|
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| } while (calculating); | ||
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| total_ber = 100 * (double)total_bit_errs / (double)total_bit_count; | ||
| printf("Max bit errs=%lu, Max BER=%lf%%\n", max_bit_errs, max_ber); | ||
| printf("Total bit errs=%lu, Total BER=%lf%%\n", total_bit_errs, total_ber); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| /* | ||
| * (C) 2019, Graham J Norbury | ||
| * gnorbury@bondcar.com | ||
| * | ||
| * Stand-alone utility to calculate bit error rate of a binary dibit capture file | ||
| * containing APCO 1011Hz test tone sequence. | ||
| * | ||
| */ | ||
|
|
||
| #include <stdio.h> | ||
| #include <stdint.h> | ||
| #include <fstream> | ||
|
|
||
| #include "frame_sync_magics.h" | ||
|
|
||
| static const int SYNC_SIZE = 48; // 48 bits | ||
| static const unsigned int SYNC_THRESHOLD = 4; // 4 bit errors in sync allowed | ||
|
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| bool test_sync(uint64_t cw, int &sync, int &errs) | ||
| { | ||
| int popcnt = 0; | ||
| popcnt = __builtin_popcountll(cw ^ P25_FRAME_SYNC_MAGIC); | ||
| if (popcnt <= SYNC_THRESHOLD) | ||
| { | ||
| errs = popcnt; | ||
| return true; | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
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||
| int main (int argc, char* argv[]) | ||
| { | ||
| uint64_t cw = 0; | ||
| int sync = 0; | ||
| int s_errs = 0; | ||
|
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||
| if (argc < 2) | ||
| { | ||
| fprintf(stderr, "Usage: ber1011 <filename>\n"); | ||
| return 1; | ||
| } | ||
|
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| char dibit; | ||
| size_t fpos = 0; | ||
| std::fstream file(argv[1], std::ios::in | std::ios::binary); | ||
| while (!file.eof()) | ||
| { | ||
| file.read((&dibit), 1); | ||
| fpos++; | ||
|
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| cw = ((cw << 1) + ((dibit >>1) & 0x1)) & 0xffffffffffff; | ||
| if (test_sync(cw, sync, s_errs)) | ||
| printf("Matched sync with %d errs at %lu bit 1\n", s_errs, fpos); | ||
|
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| cw = ((cw << 1) + (dibit & 0x1)) & 0xffffffffffff; | ||
| if (test_sync(cw, sync, s_errs)) | ||
| printf("Matched sync with %d errs at %lu bit 0\n", s_errs, fpos); | ||
|
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||
| } | ||
|
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| return 0; | ||
|
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||
| } | ||
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