From dd2233f7635eebff1ec052fbc68bc4d8a387f0b0 Mon Sep 17 00:00:00 2001 From: f4exb Date: Fri, 10 Jun 2022 19:17:56 +0200 Subject: [PATCH] M17 mod/demod: moved m17 specific code to a new modems library --- CMakeLists.txt | 1 + exports/export.h | 11 + modems/CMakeLists.txt | 54 ++ .../channelrx/demodm17 => modems}/m17/CRC16.h | 0 .../demodm17 => modems}/m17/CarrierDetect.h | 0 .../demodm17 => modems}/m17/ClockRecovery.h | 0 .../demodm17 => modems}/m17/Convolution.h | 0 .../demodm17 => modems}/m17/Correlator.cpp | 0 .../demodm17 => modems}/m17/Correlator.h | 4 +- .../m17/DataCarrierDetect.h | 0 .../demodm17 => modems}/m17/DeviationError.h | 0 .../demodm17 => modems}/m17/Filter.h | 0 .../demodm17 => modems}/m17/FirFilter.h | 0 .../m17/FreqDevEstimator.cpp | 0 .../m17/FreqDevEstimator.h | 4 +- .../demodm17 => modems}/m17/FrequencyError.h | 0 .../demodm17 => modems}/m17/Fsk4Demod.h | 0 .../demodm17 => modems}/m17/Golay24.cpp | 0 .../demodm17 => modems}/m17/Golay24.h | 4 +- .../demodm17 => modems}/m17/IirFilter.h | 0 .../demodm17 => modems}/m17/LinkSetupFrame.h | 0 .../m17/M17Demodulator.cpp | 0 .../demodm17 => modems}/m17/M17Demodulator.h | 10 +- .../demodm17 => modems}/m17/M17FrameDecoder.h | 0 .../demodm17 => modems}/m17/M17Framer.h | 0 modems/m17/M17Modulator.h | 362 ++++++++++ .../demodm17 => modems}/m17/M17Randomizer.h | 0 .../demodm17 => modems}/m17/M17Synchronizer.h | 0 .../demodm17 => modems}/m17/PhaseEstimator.h | 0 .../m17/PolynomialInterleaver.h | 0 .../demodm17 => modems}/m17/SlidingDFT.h | 0 .../demodm17 => modems}/m17/SymbolEvm.h | 0 .../demodm17 => modems}/m17/Trellis.h | 0 .../channelrx/demodm17 => modems}/m17/Util.h | 0 .../demodm17 => modems}/m17/Viterbi.h | 0 .../demodm17 => modems}/m17/ax25_frame.h | 0 .../channelrx/demodm17 => modems}/m17/queue.h | 0 plugins/channelrx/demodm17/CMakeLists.txt | 10 +- plugins/channelrx/demodm17/m17/M17Modulator.h | 637 ------------------ 39 files changed, 442 insertions(+), 655 deletions(-) create mode 100644 modems/CMakeLists.txt rename {plugins/channelrx/demodm17 => modems}/m17/CRC16.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/CarrierDetect.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/ClockRecovery.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Convolution.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Correlator.cpp (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Correlator.h (99%) rename {plugins/channelrx/demodm17 => modems}/m17/DataCarrierDetect.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/DeviationError.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Filter.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/FirFilter.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/FreqDevEstimator.cpp (100%) rename {plugins/channelrx/demodm17 => modems}/m17/FreqDevEstimator.h (98%) rename {plugins/channelrx/demodm17 => modems}/m17/FrequencyError.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Fsk4Demod.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Golay24.cpp (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Golay24.h (98%) rename {plugins/channelrx/demodm17 => modems}/m17/IirFilter.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/LinkSetupFrame.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/M17Demodulator.cpp (100%) rename {plugins/channelrx/demodm17 => modems}/m17/M17Demodulator.h (98%) rename {plugins/channelrx/demodm17 => modems}/m17/M17FrameDecoder.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/M17Framer.h (100%) create mode 100644 modems/m17/M17Modulator.h rename {plugins/channelrx/demodm17 => modems}/m17/M17Randomizer.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/M17Synchronizer.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/PhaseEstimator.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/PolynomialInterleaver.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/SlidingDFT.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/SymbolEvm.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Trellis.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Util.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/Viterbi.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/ax25_frame.h (100%) rename {plugins/channelrx/demodm17 => modems}/m17/queue.h (100%) delete mode 100644 plugins/channelrx/demodm17/m17/M17Modulator.h diff --git a/CMakeLists.txt b/CMakeLists.txt index 09c50222c..a5347fb37 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -546,6 +546,7 @@ add_subdirectory(qrtplib) add_subdirectory(swagger) add_subdirectory(devices) add_subdirectory(sdrbench) +add_subdirectory(modems) if (BUILD_GUI) add_subdirectory(sdrgui) diff --git a/exports/export.h b/exports/export.h index d66a0c2df..0ad1c8a7e 100644 --- a/exports/export.h +++ b/exports/export.h @@ -139,5 +139,16 @@ # define SDRBENCH_API #endif +/* the 'M17_API' controls the import/export of 'm17' symbols + */ +#if !defined(sdrangel_STATIC) +# ifdef m17_EXPORTS +# define M17_API __SDR_EXPORT +# else +# define M17_API __SDR_IMPORT +# endif +#else +# define M17_API +#endif #endif /* __SDRANGEL_EXPORT_H */ diff --git a/modems/CMakeLists.txt b/modems/CMakeLists.txt new file mode 100644 index 000000000..a6e37437e --- /dev/null +++ b/modems/CMakeLists.txt @@ -0,0 +1,54 @@ +project(modems) + +set(modems_SOURCES + m17/Correlator.cpp + m17/FreqDevEstimator.cpp + m17/Golay24.cpp + m17/M17Demodulator.cpp +) + +set(modems_HEADERS + m17/ax25_frame.h + m17/CarrierDetect.h + m17/ClockRecovery.h + m17/Convolution.h + m17/Correlator.h + m17/CRC16.h + m17/DataCarrierDetect.h + m17/DeviationError.h + m17/Filter.h + m17/FirFilter.h + m17/FreqDevEstimator.h + m17/FrequencyError.h + m17/Fsk4Demod.h + m17/Golay24.h + m17/IirFilter.h + m17/LinkSetupFrame.h + m17/M17Demodulator.h + m17/M17FrameDecoder.h + m17/M17Framer.h + m17/M17Modulator.h + m17/M17Modulator.orig.h + m17/M17Randomizer.h + m17/M17Synchronizer.h + m17/PhaseEstimator.h + m17/PolynomialInterleaver.h + m17/queue.h + m17/SlidingDFT.h + m17/SymbolEvm.h + m17/Trellis.h + m17/Util.h + m17/Viterbi.h +) + +include_directories( + ${CMAKE_SOURCE_DIR}/exports +) + +add_library(modems SHARED + ${modems_SOURCES} +) + +target_link_libraries(modems) + +install(TARGETS modems DESTINATION ${INSTALL_LIB_DIR}) diff --git a/plugins/channelrx/demodm17/m17/CRC16.h b/modems/m17/CRC16.h similarity index 100% rename from plugins/channelrx/demodm17/m17/CRC16.h rename to modems/m17/CRC16.h diff --git a/plugins/channelrx/demodm17/m17/CarrierDetect.h b/modems/m17/CarrierDetect.h similarity index 100% rename from plugins/channelrx/demodm17/m17/CarrierDetect.h rename to modems/m17/CarrierDetect.h diff --git a/plugins/channelrx/demodm17/m17/ClockRecovery.h b/modems/m17/ClockRecovery.h similarity index 100% rename from plugins/channelrx/demodm17/m17/ClockRecovery.h rename to modems/m17/ClockRecovery.h diff --git a/plugins/channelrx/demodm17/m17/Convolution.h b/modems/m17/Convolution.h similarity index 100% rename from plugins/channelrx/demodm17/m17/Convolution.h rename to modems/m17/Convolution.h diff --git a/plugins/channelrx/demodm17/m17/Correlator.cpp b/modems/m17/Correlator.cpp similarity index 100% rename from plugins/channelrx/demodm17/m17/Correlator.cpp rename to modems/m17/Correlator.cpp diff --git a/plugins/channelrx/demodm17/m17/Correlator.h b/modems/m17/Correlator.h similarity index 99% rename from plugins/channelrx/demodm17/m17/Correlator.h rename to modems/m17/Correlator.h index cefd5dfc9..3b5bdcb83 100644 --- a/plugins/channelrx/demodm17/m17/Correlator.h +++ b/modems/m17/Correlator.h @@ -13,9 +13,11 @@ #include #include +#include "export.h" + namespace mobilinkd { -struct Correlator +struct M17_API Correlator { static constexpr size_t SYMBOLS = 8; static constexpr size_t SAMPLES_PER_SYMBOL = 10; diff --git a/plugins/channelrx/demodm17/m17/DataCarrierDetect.h b/modems/m17/DataCarrierDetect.h similarity index 100% rename from plugins/channelrx/demodm17/m17/DataCarrierDetect.h rename to modems/m17/DataCarrierDetect.h diff --git a/plugins/channelrx/demodm17/m17/DeviationError.h b/modems/m17/DeviationError.h similarity index 100% rename from plugins/channelrx/demodm17/m17/DeviationError.h rename to modems/m17/DeviationError.h diff --git a/plugins/channelrx/demodm17/m17/Filter.h b/modems/m17/Filter.h similarity index 100% rename from plugins/channelrx/demodm17/m17/Filter.h rename to modems/m17/Filter.h diff --git a/plugins/channelrx/demodm17/m17/FirFilter.h b/modems/m17/FirFilter.h similarity index 100% rename from plugins/channelrx/demodm17/m17/FirFilter.h rename to modems/m17/FirFilter.h diff --git a/plugins/channelrx/demodm17/m17/FreqDevEstimator.cpp b/modems/m17/FreqDevEstimator.cpp similarity index 100% rename from plugins/channelrx/demodm17/m17/FreqDevEstimator.cpp rename to modems/m17/FreqDevEstimator.cpp diff --git a/plugins/channelrx/demodm17/m17/FreqDevEstimator.h b/modems/m17/FreqDevEstimator.h similarity index 98% rename from plugins/channelrx/demodm17/m17/FreqDevEstimator.h rename to modems/m17/FreqDevEstimator.h index f65c12759..0e8b066d1 100644 --- a/plugins/channelrx/demodm17/m17/FreqDevEstimator.h +++ b/modems/m17/FreqDevEstimator.h @@ -10,6 +10,8 @@ #include #include +#include "export.h" + namespace mobilinkd { /** @@ -24,7 +26,7 @@ namespace mobilinkd { * Estimates are expected to be updated at each sync word. But they can * be updated more frequently, such as during the preamble. */ -class FreqDevEstimator +class M17_API FreqDevEstimator { using sample_filter_t = BaseIirFilter<3>; diff --git a/plugins/channelrx/demodm17/m17/FrequencyError.h b/modems/m17/FrequencyError.h similarity index 100% rename from plugins/channelrx/demodm17/m17/FrequencyError.h rename to modems/m17/FrequencyError.h diff --git a/plugins/channelrx/demodm17/m17/Fsk4Demod.h b/modems/m17/Fsk4Demod.h similarity index 100% rename from plugins/channelrx/demodm17/m17/Fsk4Demod.h rename to modems/m17/Fsk4Demod.h diff --git a/plugins/channelrx/demodm17/m17/Golay24.cpp b/modems/m17/Golay24.cpp similarity index 100% rename from plugins/channelrx/demodm17/m17/Golay24.cpp rename to modems/m17/Golay24.cpp diff --git a/plugins/channelrx/demodm17/m17/Golay24.h b/modems/m17/Golay24.h similarity index 98% rename from plugins/channelrx/demodm17/m17/Golay24.h rename to modems/m17/Golay24.h index 10a28fad5..b3dbcf45c 100644 --- a/plugins/channelrx/demodm17/m17/Golay24.h +++ b/modems/m17/Golay24.h @@ -9,6 +9,8 @@ #include #include +#include "export.h" + namespace mobilinkd { // Parts are adapted from: @@ -79,7 +81,7 @@ constexpr array sort(array array) } // Golay24_detail -struct Golay24 +struct M17_API Golay24 { #pragma pack(push, 1) struct SyndromeMapEntry diff --git a/plugins/channelrx/demodm17/m17/IirFilter.h b/modems/m17/IirFilter.h similarity index 100% rename from plugins/channelrx/demodm17/m17/IirFilter.h rename to modems/m17/IirFilter.h diff --git a/plugins/channelrx/demodm17/m17/LinkSetupFrame.h b/modems/m17/LinkSetupFrame.h similarity index 100% rename from plugins/channelrx/demodm17/m17/LinkSetupFrame.h rename to modems/m17/LinkSetupFrame.h diff --git a/plugins/channelrx/demodm17/m17/M17Demodulator.cpp b/modems/m17/M17Demodulator.cpp similarity index 100% rename from plugins/channelrx/demodm17/m17/M17Demodulator.cpp rename to modems/m17/M17Demodulator.cpp diff --git a/plugins/channelrx/demodm17/m17/M17Demodulator.h b/modems/m17/M17Demodulator.h similarity index 98% rename from plugins/channelrx/demodm17/m17/M17Demodulator.h rename to modems/m17/M17Demodulator.h index 7bcc604ba..51b3703da 100644 --- a/plugins/channelrx/demodm17/m17/M17Demodulator.h +++ b/modems/m17/M17Demodulator.h @@ -18,15 +18,11 @@ #include #include +#include "export.h" + namespace mobilinkd { -namespace detail -{ - - -} // detail - -struct M17Demodulator +struct M17_API M17Demodulator { static const uint16_t SAMPLE_RATE = 48000; static const uint16_t SYMBOL_RATE = 4800; diff --git a/plugins/channelrx/demodm17/m17/M17FrameDecoder.h b/modems/m17/M17FrameDecoder.h similarity index 100% rename from plugins/channelrx/demodm17/m17/M17FrameDecoder.h rename to modems/m17/M17FrameDecoder.h diff --git a/plugins/channelrx/demodm17/m17/M17Framer.h b/modems/m17/M17Framer.h similarity index 100% rename from plugins/channelrx/demodm17/m17/M17Framer.h rename to modems/m17/M17Framer.h diff --git a/modems/m17/M17Modulator.h b/modems/m17/M17Modulator.h new file mode 100644 index 000000000..0d4e1a5c8 --- /dev/null +++ b/modems/m17/M17Modulator.h @@ -0,0 +1,362 @@ +#pragma once + +#include "FirFilter.h" +#include "LinkSetupFrame.h" +#include "CRC16.h" +#include "Convolution.h" +#include "PolynomialInterleaver.h" +#include "M17Randomizer.h" +#include "Util.h" +#include "Golay24.h" +#include "Trellis.h" + +#include +#include +#include +#include +#include +#include +#include + +namespace mobilinkd +{ + +/** + * Common routines extracted from the original asynchronous M17 modulator. + * It is used to produce the various symbol sequences but modulation is handled at + * upper level. + */ +struct M17Modulator +{ +public: + using symbols_t = std::array; // One frame of symbols. + using baseband_t = std::array; // One frame of baseband data @ 48ksps + using bitstream_t = std::array; // M17 frame of bits (in bytes). + using lsf_t = std::array; // Link setup frame bytes. + using lich_segment_t = std::array; // Golay-encoded LICH. + using lich_t = std::array; // All LICH segments. + using audio_frame_t = std::array; + using codec_frame_t = std::array; + using payload_t = std::array; // Bytes in the payload of a data frame. + using frame_t = std::array; // M17 frame (without sync word). + + static constexpr std::array SYNC_WORD = {0x32, 0x43}; + static constexpr std::array LSF_SYNC_WORD = {0x55, 0xF7}; + static constexpr std::array DATA_SYNC_WORD = {0xFF, 0x5D}; + + static constexpr int8_t bits_to_symbol(uint8_t bits) + { + switch (bits) + { + case 0: return 1; + case 1: return 3; + case 2: return -1; + case 3: return -3; + } + + return 0; + } + + /** + * Encode each LSF segment into a Golay-encoded LICH segment bitstream. + */ + static + lich_segment_t make_lich_segment(std::array segment, uint8_t segment_number) + { + lich_segment_t result; + uint16_t tmp; + uint32_t encoded; + + tmp = segment[0] << 4 | ((segment[1] >> 4) & 0x0F); + encoded = mobilinkd::Golay24::encode24(tmp); + + for (size_t i = 0; i != 24; ++i) + { + assign_bit_index(result, i, (encoded & (1 << 23)) != 0); + encoded <<= 1; + } + + tmp = ((segment[1] & 0x0F) << 8) | segment[2]; + encoded = mobilinkd::Golay24::encode24(tmp); + + for (size_t i = 24; i != 48; ++i) + { + assign_bit_index(result, i, (encoded & (1 << 23)) != 0); + encoded <<= 1; + } + + tmp = segment[3] << 4 | ((segment[4] >> 4) & 0x0F); + encoded = mobilinkd::Golay24::encode24(tmp); + + for (size_t i = 48; i != 72; ++i) + { + assign_bit_index(result, i, (encoded & (1 << 23)) != 0); + encoded <<= 1; + } + + tmp = ((segment[4] & 0x0F) << 8) | (segment_number << 5); + encoded = mobilinkd::Golay24::encode24(tmp); + + for (size_t i = 72; i != 96; ++i) + { + assign_bit_index(result, i, (encoded & (1 << 23)) != 0); + encoded <<= 1; + } + + return result; + } + + /** + * Construct the link setup frame and split into LICH segments. + */ + void make_link_setup(lich_t& lich, mobilinkd::M17Modulator::frame_t lsf) + { + using namespace mobilinkd; + + lsf_t lsf; + lsf.fill(0); + + auto rit = std::copy(source_.begin(), source_.end(), lsf.begin()); + std::copy(dest_.begin(), dest_.end(), rit); + lsf[12] = 0; + lsf[13] = 5; + + crc_.reset(); + + for (size_t i = 0; i != 28; ++i) { + crc_(lsf[i]); + } + + auto checksum = crc_.get_bytes(); + lsf[28] = checksum[0]; + lsf[29] = checksum[1]; + + // Build LICH segments + for (size_t i = 0; i != lich.size(); ++i) + { + std::array segment; + std::copy(lsf.begin() + i * 5, lsf.begin() + (i + 1) * 5, segment.begin()); + auto lich_segment = make_lich_segment(segment, i); + std::copy(lich_segment.begin(), lich_segment.end(), lich[i].begin()); + } + + auto encoded = conv_encode(lsf); + + auto size = puncture_bytes(encoded, lsf, P1); + assert(size == 368); + + interleaver_.interleave(lsf); + randomizer_(lsf); + } + + /** + * Append the LICH and Convolutionally encoded payload, interleave and randomize + * the frame bits, and produce the frame. + */ + void make_audio_frame(const lich_segment_t& lich, const payload_t& data, mobilinkd::M17Modulator::frame_t& frame) + { + using namespace mobilinkd; + + auto it = std::copy(lich.begin(), lich.end(), frame.begin()); + std::copy(data.begin(), data.end(), it); + + interleaver_.interleave(frame); + randomizer_(frame); + } + + /** + * Assemble the audio frame payload by appending the frame number, encoded audio, + * and CRC, then convolutionally coding and puncturing the data. + */ + payload_t make_payload(uint16_t frame_number, const codec_frame_t& payload) + { + std::array data; // FN, Audio, CRC = 2 + 16 + 2; + data[0] = uint8_t((frame_number >> 8) & 0xFF); + data[1] = uint8_t(frame_number & 0xFF); + std::copy(payload.begin(), payload.end(), data.begin() + 2); + crc_.reset(); + + for (size_t i = 0; i != 18; ++i) { + crc_(data[i]); + } + + auto checksum = crc_.get_bytes(); + data[18] = checksum[0]; + data[19] = checksum[1]; + + auto encoded = conv_encode(data); + + payload_t punctured; + auto size = puncture_bytes(encoded, punctured, mobilinkd::P2); + assert(size == 272); + return punctured; + } + + /* + * Converts a suite of 192 symbols (from the 384 bits of a frame) into 1920 16 bit integer samples to be used + * in the final FM modulator (baseband). Sample rate is expected to be 48 kS/s. This is the original 48 kS/s + * 16 bit audio output of the modulator. + */ + static baseband_t symbols_to_baseband(const symbols_t& symbols) + { + // Generated using scikit-commpy + static const auto rrc_taps = std::array{ + -0.009265784007800534, -0.006136551625729697, -0.001125978562075172, 0.004891777252042491, + 0.01071805138282269, 0.01505751553351295, 0.01679337935001369, 0.015256245142156299, + 0.01042830577908502, 0.003031522725559901, -0.0055333532968188165, -0.013403099825723372, + -0.018598682349642525, -0.01944761739590459, -0.015005271935951746, -0.0053887880354343935, + 0.008056525910253532, 0.022816244158307273, 0.035513467692208076, 0.04244131815783876, + 0.04025481153629372, 0.02671818654865632, 0.0013810216516704976, -0.03394615682795165, + -0.07502635967975885, -0.11540977897637611, -0.14703962203941534, -0.16119995609538576, + -0.14969512896336504, -0.10610329539459686, -0.026921412469634916, 0.08757875030779196, + 0.23293327870303457, 0.4006012210123992, 0.5786324696325503, 0.7528286479934068, + 0.908262741447522, 1.0309661131633199, 1.1095611856548013, 1.1366197723675815, + 1.1095611856548013, 1.0309661131633199, 0.908262741447522, 0.7528286479934068, + 0.5786324696325503, 0.4006012210123992, 0.23293327870303457, 0.08757875030779196, + -0.026921412469634916, -0.10610329539459686, -0.14969512896336504, -0.16119995609538576, + -0.14703962203941534, -0.11540977897637611, -0.07502635967975885, -0.03394615682795165, + 0.0013810216516704976, 0.02671818654865632, 0.04025481153629372, 0.04244131815783876, + 0.035513467692208076, 0.022816244158307273, 0.008056525910253532, -0.0053887880354343935, + -0.015005271935951746, -0.01944761739590459, -0.018598682349642525, -0.013403099825723372, + -0.0055333532968188165, 0.003031522725559901, 0.01042830577908502, 0.015256245142156299, + 0.01679337935001369, 0.01505751553351295, 0.01071805138282269, 0.004891777252042491, + -0.001125978562075172, -0.006136551625729697, -0.009265784007800534 + }; + static BaseFirFilter::value> rrc = makeFirFilter(rrc_taps); + + std::array baseband; + baseband.fill(0); + + for (size_t i = 0; i != symbols.size(); ++i) { + baseband[i * 10] = symbols[i]; + } + + for (auto& b : baseband) { + b = rrc(b) * 25; + } + + return baseband; + } + + M17Modulator(const std::string& source, const std::string& dest = "") : + source_(encode_callsign(source)), + dest_(encode_callsign(dest)) + { } + + /** + * Set the source identifier (callsign) for the transmitter. + */ + void source(const std::string& callsign) { + source_ = encode_callsign(callsign); + } + + /** + * Set the destination identifier for the transmitter. A blank value is + * interpreted as the broadcast address. This is the default. + */ + void dest(const std::string& callsign) { + dest_ = encode_callsign(callsign); + } + +private: + M17ByteRandomizer<46> randomizer_; + PolynomialInterleaver<45, 92, 368> interleaver_; + CRC16<0x5935, 0xFFFF> crc_; + LinkSetupFrame::encoded_call_t source_; + LinkSetupFrame::encoded_call_t dest_; + + static LinkSetupFrame::encoded_call_t encode_callsign(std::string callsign) + { + LinkSetupFrame::encoded_call_t encoded_call = {0xff,0xff,0xff,0xff,0xff,0xff}; + + if (callsign.empty() || callsign.size() > 9) { + return encoded_call; + } + + mobilinkd::LinkSetupFrame::call_t call; + call.fill(0); + std::copy(callsign.begin(), callsign.end(), call.begin()); + encoded_call = LinkSetupFrame::encode_callsign(call); + return encoded_call; + } + + template + static std::array bytes_to_symbols(const std::array& bytes) + { + std::array result; + size_t index = 0; + + for (auto b : bytes) + { + for (size_t i = 0; i != 4; ++i) + { + result[index++] = bits_to_symbol(b >> 6); + b <<= 2; + } + } + + return result; + } + + template + static std::array conv_encode(std::array data) + { + std::array result; + + uint8_t bit_index = 0; + uint8_t byte_index = 0; + uint8_t tmp = 0; + + uint32_t memory = 0; + + for (auto b : data) + { + for (size_t i = 0; i != 8; ++i) + { + uint32_t x = (b & 0x80) >> 7; + b <<= 1; + memory = update_memory<4>(memory, x); + tmp = (tmp << 1) | convolve_bit(031, memory); + tmp = (tmp << 1) | convolve_bit(027, memory); + bit_index += 2; + + if (bit_index == 8) + { + bit_index = 0; + result[byte_index++] = tmp; + tmp = 0; + } + } + } + + // Flush the encoder. + for (size_t i = 0; i != 4; ++i) + { + memory = update_memory<4>(memory, 0); + tmp = (tmp << 1) | convolve_bit(031, memory); + tmp = (tmp << 1) | convolve_bit(027, memory); + bit_index += 2; + + if (bit_index == 8) + { + bit_index = 0; + result[byte_index++] = tmp; + tmp = 0; + } + } + + // Frame may not end on a byte boundary. + if (bit_index != 0) + { + while (bit_index++ != 8) { + tmp <<= 1; + } + + result[byte_index] = tmp; + } + + return result; + } +}; + +} // mobilinkd diff --git a/plugins/channelrx/demodm17/m17/M17Randomizer.h b/modems/m17/M17Randomizer.h similarity index 100% rename from plugins/channelrx/demodm17/m17/M17Randomizer.h rename to modems/m17/M17Randomizer.h diff --git a/plugins/channelrx/demodm17/m17/M17Synchronizer.h b/modems/m17/M17Synchronizer.h similarity index 100% rename from plugins/channelrx/demodm17/m17/M17Synchronizer.h rename to modems/m17/M17Synchronizer.h diff --git a/plugins/channelrx/demodm17/m17/PhaseEstimator.h b/modems/m17/PhaseEstimator.h similarity index 100% rename from plugins/channelrx/demodm17/m17/PhaseEstimator.h rename to modems/m17/PhaseEstimator.h diff --git a/plugins/channelrx/demodm17/m17/PolynomialInterleaver.h b/modems/m17/PolynomialInterleaver.h similarity index 100% rename from plugins/channelrx/demodm17/m17/PolynomialInterleaver.h rename to modems/m17/PolynomialInterleaver.h diff --git a/plugins/channelrx/demodm17/m17/SlidingDFT.h b/modems/m17/SlidingDFT.h similarity index 100% rename from plugins/channelrx/demodm17/m17/SlidingDFT.h rename to modems/m17/SlidingDFT.h diff --git a/plugins/channelrx/demodm17/m17/SymbolEvm.h b/modems/m17/SymbolEvm.h similarity index 100% rename from plugins/channelrx/demodm17/m17/SymbolEvm.h rename to modems/m17/SymbolEvm.h diff --git a/plugins/channelrx/demodm17/m17/Trellis.h b/modems/m17/Trellis.h similarity index 100% rename from plugins/channelrx/demodm17/m17/Trellis.h rename to modems/m17/Trellis.h diff --git a/plugins/channelrx/demodm17/m17/Util.h b/modems/m17/Util.h similarity index 100% rename from plugins/channelrx/demodm17/m17/Util.h rename to modems/m17/Util.h diff --git a/plugins/channelrx/demodm17/m17/Viterbi.h b/modems/m17/Viterbi.h similarity index 100% rename from plugins/channelrx/demodm17/m17/Viterbi.h rename to modems/m17/Viterbi.h diff --git a/plugins/channelrx/demodm17/m17/ax25_frame.h b/modems/m17/ax25_frame.h similarity index 100% rename from plugins/channelrx/demodm17/m17/ax25_frame.h rename to modems/m17/ax25_frame.h diff --git a/plugins/channelrx/demodm17/m17/queue.h b/modems/m17/queue.h similarity index 100% rename from plugins/channelrx/demodm17/m17/queue.h rename to modems/m17/queue.h diff --git a/plugins/channelrx/demodm17/CMakeLists.txt b/plugins/channelrx/demodm17/CMakeLists.txt index f25518827..391206960 100644 --- a/plugins/channelrx/demodm17/CMakeLists.txt +++ b/plugins/channelrx/demodm17/CMakeLists.txt @@ -10,10 +10,6 @@ set(m17_SOURCES m17demodbaudrates.cpp m17demodprocessor.cpp m17demodfilters.cpp - m17/Golay24.cpp - m17/M17Demodulator.cpp - m17/FreqDevEstimator.cpp - m17/Correlator.cpp ) set(m17_HEADERS @@ -26,15 +22,12 @@ set(m17_HEADERS m17demodbaudrates.h m17demodprocessor.h m17demodfilters.h - m17/Golay24.h - m17/M17Demodulator.h - m17/FreqDevEstimator.h - m17/Correlator.h ) include_directories( ${CMAKE_SOURCE_DIR}/swagger/sdrangel/code/qt5/client ${CODEC2_INCLUDE_DIR} + ${CMAKE_SOURCE_DIR}/modems ) if(NOT SERVER_MODE) @@ -76,6 +69,7 @@ target_link_libraries(${TARGET_NAME} ${TARGET_LIB_GUI} swagger ${CODEC2_LIBRARIES} + modems ) install(TARGETS ${TARGET_NAME} DESTINATION ${INSTALL_FOLDER}) diff --git a/plugins/channelrx/demodm17/m17/M17Modulator.h b/plugins/channelrx/demodm17/m17/M17Modulator.h deleted file mode 100644 index 5aa0b1df9..000000000 --- a/plugins/channelrx/demodm17/m17/M17Modulator.h +++ /dev/null @@ -1,637 +0,0 @@ -#pragma once - -#include "queue.h" -#include "FirFilter.h" -#include "LinkSetupFrame.h" -#include "CRC16.h" -#include "Convolution.h" -#include "PolynomialInterleaver.h" -#include "M17Randomizer.h" -#include "Util.h" -#include "Golay24.h" -#include "Trellis.h" - -#include - -#include -#include -#include -#include -#include -#include -#include - -namespace mobilinkd -{ - -/** - * Asynchronous M17 modulator. This modulator is initialized with the source and - * destination callsigns. It is then run by attaching an input queue and an output - * queue. The modulator reads 16-bit, 8ksps, 1-channel audio samples from the input - * queue and an M17 bitstream (in 8-bit bytes, 4 symbols per byte) to the output queue. - * - * The call to run(), which is used to attach the queues, returns immediately, starting - * a new thread in a detached state. run() returns a future, which may contain error - * information if an exception is thrown. - * - * The modulator stops when the input queue is closed. - * - * The modulator starts in a paused state, discarding all input. - * - * The modulator is started by calling ptt_on(). This causes the preamble and link - * setup frame to be sent. The modulator then starts reading from the input queue - * and writing the data stream to the output queue. - * - * The modulator can be paused by calling ptt_off(). This will cause any audio - * samples remaining in the input queue to be discarded. The final frame will - * be sent with the EOS bit set. The output queue should always be completely - * drained and all symbols output should be transmitted to ensure proper EOS - * signalling. - * - * Output will be bursty -- their is no throttling of the symbol stream. As soon - * as enough input samples are received to fill the M17 payload field, the frame - * will be constructed and the symbol stream output on the queue. - * - * @invariant The state of the modulator is one of INACTIVE, IDLE, PREAMBLE, - * LINK_SETUP, ACTIVE, or END_OF_STREAM. - * - * The modulator transitions from INACTIVE to IDLE when run() is called. - * - * The modulator transitions from IDLE to PREAMBLE when ptt_on() is called. - * - * The modulator will transition from PREAMBLE to LINK_SETUP to ACTIVE automatically. - * - * The modulator transitions from ACTIVE to END_OF_STREAM when ptt_off() is called. - * - * The modulator transitions from END_OF_STREAM to IDLE after the last audio - * frame is emitted. - * - * The modulator will transition from IDLE to INACTIVE when the input or output - * queue is closed. - * - * The modulator will emit at least 3 frames when ptt_on() is called: the preamble, - * the link setup frame, and one audio frame with the EOS flag set. - * - * It is an error to close the input or output stream when the modulator is not IDLE. - * - * @section Thread Safety - * - * Internally, the modulator is thread-safe. It is running with a background thread - * reading from and writing to thread-safe queues. Externally, the modulator expects - * that all API calls made synchronously as if from a single thread of control. - * - * @section Convertion Functions - * - * There are two public static conversion functions provided to support conversion of - * the output bitstream into either a symbol stream or into a 48ksps baseband stream. - */ -struct M17Modulator -{ -public: - using bitstream_queue_t = queue; // 1 frame's worth of data, 48 bytes, 192 symbols, 384 bits. - using audio_queue_t = queue; // 1 frame's worth of data. - using symbols_t = std::array; // One frame of symbols. - using baseband_t = std::array; // One frame of baseband data @ 48ksps - using bitstream_t = std::array; // M17 frame of bits (in bytes). - - enum class State {INACTIVE, IDLE, PREAMBLE, LINK_SETUP, ACTIVE, END_OF_STREAM}; - -private: - using lsf_t = std::array; // Link setup frame bytes. - - using lich_segment_t = std::array; // Golay-encoded LICH. - using lich_t = std::array; // All LICH segments. - using audio_frame_t = std::array; - using codec_frame_t = std::array; - using payload_t = std::array; // Bytes in the payload of a data frame. - using frame_t = std::array; // M17 frame (without sync word). - - static constexpr std::array SYNC_WORD = {0x32, 0x43}; - static constexpr std::array LSF_SYNC_WORD = {0x55, 0xF7}; - static constexpr std::array DATA_SYNC_WORD = {0xFF, 0x5D}; - - - std::shared_ptr audio_queue_; // Input queue. - std::shared_ptr bitstream_queue_; // Output queue. - std::atomic state_; - struct CODEC2* codec2_ = nullptr; - M17ByteRandomizer<46> randomizer_; - PolynomialInterleaver<45, 92, 368> interleaver_; - CRC16<0x5935, 0xFFFF> crc_; - LinkSetupFrame::encoded_call_t source_; - LinkSetupFrame::encoded_call_t dest_; - - static LinkSetupFrame::encoded_call_t encode_callsign(std::string callsign) - { - LinkSetupFrame::encoded_call_t encoded_call = {0xff,0xff,0xff,0xff,0xff,0xff}; - - if (callsign.empty() || callsign.size() > 9) return encoded_call; - - mobilinkd::LinkSetupFrame::call_t call; - call.fill(0); - std::copy(callsign.begin(), callsign.end(), call.begin()); - encoded_call = LinkSetupFrame::encode_callsign(call); - return encoded_call; - } - - static constexpr int8_t bits_to_symbol(uint8_t bits) - { - switch (bits) - { - case 0: return 1; - case 1: return 3; - case 2: return -1; - case 3: return -3; - } - return 0; - } - - template - static std::array bits_to_symbols(const std::array& bits) - { - std::array result; - size_t index = 0; - for (size_t i = 0; i != N; i += 2) - { - result[index++] = bits_to_symbol((bits[i] << 1) | bits[i + 1]); - } - return result; - } - - void output_frame(std::array sync_word, const frame_t& frame) - { - for (auto c : sync_word) bitstream_queue_->put(c); - for (auto c : frame) bitstream_queue_->put(c); - } - - void send_preamble() - { - // Preamble is simple... bytes -> symbols. - std::array preamble_bytes; - preamble_bytes.fill(0x77); - for (auto c : preamble_bytes) bitstream_queue_->put(c); - } - - template - static std::array conv_encode(std::array data) - { - std::array result; - - uint8_t bit_index = 0; - uint8_t byte_index = 0; - uint8_t tmp = 0; - - uint32_t memory = 0; - for (auto b : data) - { - for (size_t i = 0; i != 8; ++i) - { - uint32_t x = (b & 0x80) >> 7; - b <<= 1; - memory = update_memory<4>(memory, x); - tmp = (tmp << 1) | convolve_bit(031, memory); - tmp = (tmp << 1) | convolve_bit(027, memory); - bit_index += 2; - if (bit_index == 8) - { - bit_index = 0; - result[byte_index++] = tmp; - tmp = 0; - } - } - } - - // Flush the encoder. - for (size_t i = 0; i != 4; ++i) - { - memory = update_memory<4>(memory, 0); - tmp = (tmp << 1) | convolve_bit(031, memory); - tmp = (tmp << 1) | convolve_bit(027, memory); - bit_index += 2; - if (bit_index == 8) - { - bit_index = 0; - result[byte_index++] = tmp; - tmp = 0; - } - } - - // Frame may not end on a byte boundary. - if (bit_index != 0) - { - while (bit_index++ != 8) tmp <<= 1; - result[byte_index] = tmp; - } - - return result; - } - - /** - * Encode each LSF segment into a Golay-encoded LICH segment bitstream. - */ - lich_segment_t make_lich_segment(std::array segment, uint8_t segment_number) - { - lich_segment_t result; - uint16_t tmp; - uint32_t encoded; - - tmp = segment[0] << 4 | ((segment[1] >> 4) & 0x0F); - encoded = mobilinkd::Golay24::encode24(tmp); - for (size_t i = 0; i != 24; ++i) - { - assign_bit_index(result, i, (encoded & (1 << 23)) != 0); - encoded <<= 1; - } - - tmp = ((segment[1] & 0x0F) << 8) | segment[2]; - encoded = mobilinkd::Golay24::encode24(tmp); - for (size_t i = 24; i != 48; ++i) - { - assign_bit_index(result, i, (encoded & (1 << 23)) != 0); - encoded <<= 1; - } - - tmp = segment[3] << 4 | ((segment[4] >> 4) & 0x0F); - encoded = mobilinkd::Golay24::encode24(tmp); - for (size_t i = 48; i != 72; ++i) - { - assign_bit_index(result, i, (encoded & (1 << 23)) != 0); - encoded <<= 1; - } - - tmp = ((segment[4] & 0x0F) << 8) | (segment_number << 5); - encoded = mobilinkd::Golay24::encode24(tmp); - for (size_t i = 72; i != 96; ++i) - { - assign_bit_index(result, i, (encoded & (1 << 23)) != 0); - encoded <<= 1; - } - - return result; - } - - /** - * Construct the link setup frame and split into LICH segments. Output the - * link setup frame and return the LICH segments to the caller. - */ - void send_link_setup(lich_t& lich) - { - using namespace mobilinkd; - - lsf_t lsf; - lsf.fill(0); - - auto rit = std::copy(source_.begin(), source_.end(), lsf.begin()); - std::copy(dest_.begin(), dest_.end(), rit); - lsf[12] = 0; - lsf[13] = 5; - - crc_.reset(); - for (size_t i = 0; i != 28; ++i) - { - crc_(lsf[i]); - } - auto checksum = crc_.get_bytes(); - lsf[28] = checksum[0]; - lsf[29] = checksum[1]; - - // Build LICH segments - for (size_t i = 0; i != lich.size(); ++i) - { - std::array segment; - std::copy(lsf.begin() + i * 5, lsf.begin() + (i + 1) * 5, segment.begin()); - auto lich_segment = make_lich_segment(segment, i); - std::copy(lich_segment.begin(), lich_segment.end(), lich[i].begin()); - } - - auto encoded = conv_encode(lsf); - - std::array punctured; - auto size = puncture_bytes(encoded, punctured, P1); - assert(size == 368); - - interleaver_.interleave(punctured); - randomizer_(punctured); - output_frame(LSF_SYNC_WORD, punctured); - } - - /** - * Append the LICH and Convolutionally encoded payload, interleave and randomize - * the frame bits, and output the frame. - */ - void send_audio_frame(const lich_segment_t& lich, const payload_t& data) - { - using namespace mobilinkd; - - std::array temp; - auto it = std::copy(lich.begin(), lich.end(), temp.begin()); - std::copy(data.begin(), data.end(), it); - - interleaver_.interleave(temp); - randomizer_(temp); - output_frame(DATA_SYNC_WORD, temp); - } - - /** - * Assemble the audio frame payload by appending the frame number, encoded audio, - * and CRC, then convolutionally coding and puncturing the data. - */ - payload_t make_payload(uint16_t frame_number, const codec_frame_t& payload) - { - std::array data; // FN, Audio, CRC = 2 + 16 + 2; - data[0] = uint8_t((frame_number >> 8) & 0xFF); - data[1] = uint8_t(frame_number & 0xFF); - std::copy(payload.begin(), payload.end(), data.begin() + 2); - - crc_.reset(); - for (size_t i = 0; i != 18; ++i) crc_(data[i]); - auto checksum = crc_.get_bytes(); - data[18] = checksum[0]; - data[19] = checksum[1]; - - auto encoded = conv_encode(data); - - payload_t punctured; - auto size = puncture_bytes(encoded, punctured, mobilinkd::P2); - assert(size == 272); - return punctured; - } - - /** - * Encode 2 frames of data. Caller must ensure that the audio is - * padded with 0s if the incoming data is incomplete. - */ - codec_frame_t encode_audio(const audio_frame_t& audio) - { - codec_frame_t result; - codec2_encode(codec2_, &result[0], const_cast(&audio[0])); - codec2_encode(codec2_, &result[8], const_cast(&audio[160])); - return result; - } - - /** - * Send the audio frame. Encodes the audio, assembles the audio frame, and - * outputs the frame on the queue. - */ - void send_audio(const lich_segment_t& lich, uint16_t frame_number, const audio_frame_t& audio) - { - auto encoded_audio = encode_audio(audio); - auto payload = make_payload(frame_number, encoded_audio); - send_audio_frame(lich, payload); - } - - /** - * Modulator state machine. Controls state transitions, ensuring that the - * M17 stream is sent and terminated appropriately. - */ - void modulate() - { - using namespace std::chrono_literals; - using clock = std::chrono::steady_clock; - - state_ = State::IDLE; - codec2_ = ::codec2_create(CODEC2_MODE_3200); - - lich_t lich; - size_t index = 0; - uint16_t frame_number = 0; - uint8_t lich_segment = 0; - audio_frame_t audio; - auto current = clock::now(); - - audio.fill(0); - - while (audio_queue_->is_open() && bitstream_queue_->is_open()) - { - int16_t sample; - if (!(audio_queue_->get(sample, 5s))) sample = 0; // May be closed. - if (!(audio_queue_->is_open())) - { - std::clog << "audio output queue closed" << std::endl; - break; - } - switch (state_) - { - case State::IDLE: - break; - case State::PREAMBLE: - send_preamble(); - state_ = State::LINK_SETUP; - break; - case State::LINK_SETUP: - send_link_setup(lich); - index = 0; - frame_number = 0; - lich_segment = 0; - state_ = State::ACTIVE; - current = clock::now(); - break; - case State::ACTIVE: - audio[index++] = sample; - if (index == audio.size()) - { - auto now = clock::now(); - if (now - current > 40ms) - { - std::clog << "WARNING: packet time exceeded" << std::endl; - } - current = now; - index = 0; - send_audio(lich[lich_segment++], frame_number++, audio); - if (frame_number == 0x8000) frame_number = 0; - if (lich_segment == lich.size()) lich_segment = 0; - audio.fill(0); - } - break; - case State::END_OF_STREAM: - audio[index++] = sample; - send_audio(lich[lich_segment++], frame_number++, audio); - audio.fill(0); - state_ = State::IDLE; - break; - default: - assert(false && "Invalid state"); - } - } - - ::codec2_destroy(codec2_); - codec2_ = nullptr; - - if (state_ != State::IDLE) throw std::logic_error("queue closed when not IDLE"); - - state_ = State::INACTIVE; - } - -public: - - M17Modulator(const std::string& source, const std::string& dest = "") : - source_(encode_callsign(source)), - dest_(encode_callsign(dest)) - { - state_.store(State::INACTIVE); - } - - /** - * Set the source identifier (callsign) for the transmitter. - */ - void source(const std::string& callsign) - { - source_ = encode_callsign(callsign); - } - - /** - * Set the destination identifier for the transmitter. A blank value is - * interpreted as the broadcast address. This is the default. - */ - void dest(const std::string& callsign) - { - dest_ = encode_callsign(callsign); - } - - /** - * Start the modulator. This starts a background thread and returns once the thread - * has started and changed the state to IDLE. - * - * @pre state is INACTIVE. - * - * @param input is a shared pointer to the audio input queue. - * @param output is a shared pointer to the symbol output queue. - * @return a future which is used to return error information to the caller. - */ - std::future run(const std::shared_ptr& input, const std::shared_ptr& output) - { - using namespace std::chrono_literals; - - assert(state_ == State::INACTIVE); - - audio_queue_ = input; - bitstream_queue_ = output; - - auto result = std::async(std::launch::async, [this](){ - this->modulate(); - }); - - // Wait until thread is active. - while (state_ != State::IDLE) std::this_thread::yield(); - - return result; - } - - /** - * Activate the modulator. This causes the modulator to transition from IDLE to - * ACTIVE. If the modulator is already ACTIVE, no action is taken. If the modulator - * is not IDLE, return is delayed until the modulator becomes IDLE (which may take - * up to 120ms), at which time the modulator is returned to the ACTIVE state. - * Otherwise the modulator immediately transistions from IDLE to ACTIVE. This will - * cause the preamble and link setup frames to be emitted. - * - * @pre run must have been called. - * @pre the input queue must be open. - * @pre the output queue must be open. - */ - void ptt_on() - { - using namespace std::chrono_literals; - - assert(state_ != State::INACTIVE); - assert(audio_queue_ && audio_queue_->is_open()); - assert(bitstream_queue_ && bitstream_queue_->is_open()); - - if (state_ == State::ACTIVE) return; - while (state_ != State::IDLE && state_ != State::INACTIVE) std::this_thread::sleep_for(1ms); - assert(state_ == State::IDLE); // Precondition violated -- one of the queues was closed. - state_ = State::PREAMBLE; - } - - /** - * Stop the modulator. - * - * @pre ptt_on() was called and the modulator is in PREAMBLE, LINK_SETUP, or ACTIVE state. - */ - void ptt_off() - { - using namespace std::chrono_literals; - - assert(state_ == State::PREAMBLE | state_ == State::LINK_SETUP | state_ == State::ACTIVE); - - // State must become active before we release PTT to ensure preamble and LSF are sent. - while (state_ != State::ACTIVE && state_ != State::INACTIVE) std::this_thread::sleep_for(1ms); - assert(state_ == State::ACTIVE); // Precondition violated -- one of the queues was closed. - state_ = State::END_OF_STREAM; - } - - void wait_until_idle() - { - using namespace std::chrono_literals; - - while (state_ != State::IDLE && state_ != State::INACTIVE) std::this_thread::sleep_for(1ms); - } - - void wait_until_inactive() - { - using namespace std::chrono_literals; - - while (state_ != State::INACTIVE) std::this_thread::sleep_for(1ms); - } - - State state() const { return state_; } - - template - static std::array bytes_to_symbols(const std::array& bytes) - { - std::array result; - size_t index = 0; - for (auto b : bytes) - { - for (size_t i = 0; i != 4; ++i) - { - result[index++] = bits_to_symbol(b >> 6); - b <<= 2; - } - } - return result; - } - - static baseband_t symbols_to_baseband(const symbols_t& symbols) - { - // Generated using scikit-commpy - static const auto rrc_taps = std::array{ - -0.009265784007800534, -0.006136551625729697, -0.001125978562075172, 0.004891777252042491, - 0.01071805138282269, 0.01505751553351295, 0.01679337935001369, 0.015256245142156299, - 0.01042830577908502, 0.003031522725559901, -0.0055333532968188165, -0.013403099825723372, - -0.018598682349642525, -0.01944761739590459, -0.015005271935951746, -0.0053887880354343935, - 0.008056525910253532, 0.022816244158307273, 0.035513467692208076, 0.04244131815783876, - 0.04025481153629372, 0.02671818654865632, 0.0013810216516704976, -0.03394615682795165, - -0.07502635967975885, -0.11540977897637611, -0.14703962203941534, -0.16119995609538576, - -0.14969512896336504, -0.10610329539459686, -0.026921412469634916, 0.08757875030779196, - 0.23293327870303457, 0.4006012210123992, 0.5786324696325503, 0.7528286479934068, - 0.908262741447522, 1.0309661131633199, 1.1095611856548013, 1.1366197723675815, - 1.1095611856548013, 1.0309661131633199, 0.908262741447522, 0.7528286479934068, - 0.5786324696325503, 0.4006012210123992, 0.23293327870303457, 0.08757875030779196, - -0.026921412469634916, -0.10610329539459686, -0.14969512896336504, -0.16119995609538576, - -0.14703962203941534, -0.11540977897637611, -0.07502635967975885, -0.03394615682795165, - 0.0013810216516704976, 0.02671818654865632, 0.04025481153629372, 0.04244131815783876, - 0.035513467692208076, 0.022816244158307273, 0.008056525910253532, -0.0053887880354343935, - -0.015005271935951746, -0.01944761739590459, -0.018598682349642525, -0.013403099825723372, - -0.0055333532968188165, 0.003031522725559901, 0.01042830577908502, 0.015256245142156299, - 0.01679337935001369, 0.01505751553351295, 0.01071805138282269, 0.004891777252042491, - -0.001125978562075172, -0.006136551625729697, -0.009265784007800534 - }; - static BaseFirFilter::value> rrc = makeFirFilter(rrc_taps); - - std::array baseband; - baseband.fill(0); - for (size_t i = 0; i != symbols.size(); ++i) - { - baseband[i * 10] = symbols[i]; - } - - for (auto& b : baseband) - { - b = rrc(b) * 25; - } - return baseband; - } -}; - -} // mobilinkd