mirror of
https://gitea.osmocom.org/cellular-infrastructure/osmo-trx.git
synced 2025-11-04 06:03:17 +00:00
1f8eb7c658
It just uses the viterbi equalizer and the sigproclib to generate and demodulate bursts and prints the bits, only useful for development. Change-Id: I852e34d9667d1f12f235f8b3da1fcc0d738b2db9
532 lines
17 KiB
C++
532 lines
17 KiB
C++
/*
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* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Eric Wild <ewild@sysmocom.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// this allows messing with the demod to check the detecton offset impact,
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// not intended for actual automated tests.
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#include "sigProcLib.h"
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extern "C" {
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#include "convert.h"
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#include <convolve.h>
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}
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#define _CRT_SECURE_NO_WARNINGS
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#include <algorithm>
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#include <string.h>
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#include <iomanip>
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#include <numeric>
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#include <memory>
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#include <iostream>
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#include <fstream>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <grgsm_vitac/grgsm_vitac.h>
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#define DO_RACH
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const int SAMPLE_SCALE_FACTOR = 1;
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template <typename DST_T, typename SRC_T, typename ST>
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void convert_and_scale(void *dst, void *src, unsigned int src_len, ST scale)
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{
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for (unsigned int i = 0; i < src_len; i++)
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reinterpret_cast<DST_T *>(dst)[i] = static_cast<DST_T>((reinterpret_cast<SRC_T *>(src)[i]) * scale);
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}
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template <typename DST_T, typename SRC_T>
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void convert_and_scale_default(void *dst, void *src, unsigned int src_len)
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{
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return convert_and_scale<DST_T, SRC_T>(dst, src, src_len, SAMPLE_SCALE_FACTOR);
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}
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static const unsigned int txFullScale = (float)(1 << 14) - 1;
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// static const unsigned int rxFullScale = (float)(1 << 14) - 1;
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static const BitVector
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gRACHBurstx("0011101001001011011111111001100110101010001111000110111101111110000111001001010110011000");
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static const BitVector gTrainingSequencex[] = {
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BitVector("00100101110000100010010111"), BitVector("00101101110111100010110111"),
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BitVector("01000011101110100100001110"), BitVector("01000111101101000100011110"),
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BitVector("00011010111001000001101011"), BitVector("01001110101100000100111010"),
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BitVector("10100111110110001010011111"), BitVector("11101111000100101110111100"),
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};
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struct mrv {
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std::vector<char> bits;
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signalVector *rvbuf;
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std::unique_ptr<std::vector<std::complex<float>>> convolved;
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// mrv(): bits(), demod_bits() {}
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CorrType ct;
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};
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static mrv genRandNormalBurstx(int tsc, int sps, int tn)
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{
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mrv retstruct;
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int i = 0;
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BitVector bits(148);
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/* Tail bits */
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for (; i < 3; i++)
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bits[i] = 0;
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/* Random bits */
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for (int j = 0; i < 60; i++, j++)
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bits[i] = rand() % 2;
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/* Stealing bit */
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bits[i++] = 0;
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/* Training sequence */
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for (int n = 0; i < 87; i++, n++)
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bits[i] = gTrainingSequencex[tsc][n];
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/* Stealing bit */
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bits[i++] = 0;
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/* Random bits */
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for (; i < 145; i++)
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bits[i] = rand() % 2;
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/* Tail bits */
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for (; i < 148; i++)
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bits[i] = 0;
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int guard = 8 + !(tn % 4);
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auto r = modulateBurst(bits, guard, sps);
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retstruct.rvbuf = r;
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for (size_t i = 0; i < bits.size(); i++)
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retstruct.bits.push_back(bits.bit(i) ? 1 : 0);
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return retstruct;
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}
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static mrv genRandAccessBurstx(int delay, int sps, int tn)
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{
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mrv retstruct;
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int i = 0;
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BitVector bits(88 + delay);
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/* delay */
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for (; i < delay; i++)
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bits[i] = 0;
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/* head and synch bits */
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for (int n = 0; i < 49 + delay; i++, n++)
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bits[i] = gRACHBurstx[n];
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/* Random bits */
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for (int j = 0; i < 85 + delay; i++, j++)
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bits[i] = rand() % 2;
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for (; i < 88 + delay; i++)
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bits[i] = 0;
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int guard = 68 - delay + !(tn % 4);
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auto r = modulateBurst(bits, guard, sps);
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retstruct.rvbuf = r;
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for (size_t i = 0; i < bits.size(); i++)
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retstruct.bits.push_back(bits.bit(i) ? 1 : 0);
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return retstruct;
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}
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extern gr_complex d_acc_training_seq[N_ACCESS_BITS]; ///<encoded training sequence of a SCH burst
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extern gr_complex d_sch_training_seq[N_SYNC_BITS]; ///<encoded training sequence of a SCH burst
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extern gr_complex d_norm_training_seq[TRAIN_SEQ_NUM]
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[N_TRAIN_BITS]; ///<encoded training sequences of a normal and dummy burst
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void sv_write_helper(signalVector *burst, std::string fname)
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{
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auto start = burst->begin();
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auto n = burst->bytes();
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char *data = reinterpret_cast<char *>(start);
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const int len_in_real = burst->size() * 2;
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auto cvrtbuf_tx_a = new int16_t[len_in_real];
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convert_float_short(cvrtbuf_tx_a, (float *)burst->begin(), float(txFullScale), len_in_real);
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std::ofstream fout;
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fout.open(fname + ".cfile", std::ios::binary | std::ios::out);
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fout.write(data, n);
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fout.close();
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fout.open(fname + ".cs16", std::ios::binary | std::ios::out);
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fout.write((char *)cvrtbuf_tx_a, len_in_real * sizeof(uint16_t));
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fout.close();
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delete[] cvrtbuf_tx_a;
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}
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// borrowed from a real world burst..
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static std::vector<std::complex<float>> chan_im_resp = {
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{ 4.1588e-05 + -0.000361925 }, { 0.000112728 + -0.000289796 }, { 0.000162952 + -0.000169028 },
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{ 0.000174185 + -2.54575e-05 }, { 0.000142947 + 0.000105992 }, { 8.65919e-05 + 0.000187041 },
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{ 4.15799e-05 + 0.000184346 }, { 5.30207e-05 + 7.84921e-05 }, { 0.000158877 + -0.000128058 },
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{ 0.000373956 + -0.000407954 }, { 0.000680606 + -0.000712065 }, { 0.00102929 + -0.000979604 },
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{ 0.00135049 + -0.00115333 }, { 0.00157434 + -0.0011948 }, { 0.00165098 + -0.00109534 },
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{ 0.00156519 + -0.000878794 }, { 0.0013399 + -0.000594285 }, { 0.00102788 + -0.00030189 },
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{ 0.000694684 + -5.58912e-05 }, { 0.000399328 + 0.000109463 }
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};
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// as above, downsampled to 1sps + just magnitude
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static std::vector<float> chan_im_resp_trunc = { 1., 0.20513351, 0.10020305, 0.11490235 };
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template <typename A, typename B>
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auto conv(const std::vector<A> &a, const std::vector<B> &b) -> std::unique_ptr<std::vector<A>>
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{
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int data_len = a.size();
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int conv_len = b.size();
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int conv_size = conv_len + data_len - 1;
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auto retv = std::make_unique<std::vector<A>>(conv_size);
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for (int i = 0; i < data_len; ++i) {
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for (int j = 0; j < conv_len; ++j) {
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(*retv)[i + j] += a[i] * b[j];
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}
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}
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return retv;
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}
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template <typename A>
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static auto conv(const A *a, int len, std::vector<float> &b)
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{
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std::vector<A> aa(len);
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std::copy_n(a, len, aa.begin());
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std::reverse(b.begin(), b.end());
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return conv(aa, b);
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}
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template <typename A>
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static auto conv(const A *a, int len, std::vector<A> &b)
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{
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std::vector<A> aa(len);
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std::copy_n(a, len, aa.begin());
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std::reverse(b.begin(), b.end());
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return conv(aa, b);
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}
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// signalvector is owning despite claiming not to, but we can pretend, too..
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static void dummy_free(void *wData){};
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static void *dummy_alloc(size_t newSize)
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{
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return 0;
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};
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template <typename T>
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size_t read_from_file(std::string path, std::vector<T> &outvec)
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{
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std::ifstream infile;
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infile.open(path, std::ios::in | std::ios::binary);
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if (infile.fail()) {
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std::cout << " not found: " << path << std::endl;
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exit(0);
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}
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infile.seekg(0, std::ios_base::end);
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size_t fsize = infile.tellg();
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auto fsize_in_T = fsize / sizeof(T);
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infile.seekg(0, std::ios_base::beg);
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outvec.resize(fsize_in_T);
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infile.read(reinterpret_cast<char *>(&outvec[0]), fsize);
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infile.close();
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std::cout << "Read " << fsize << " from " << path << std::endl;
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return fsize;
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}
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void demod_real_burst(int num = 0)
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{
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auto path = "./nb_chunk_tsc7.cfile";
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auto bitfile = "./demodbits_tsc7.s8";
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std::vector<std::complex<float>> burstdata;
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std::vector<char> bitdata;
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read_from_file(path, burstdata);
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read_from_file(bitfile, bitdata);
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// print "known good" burst bits
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std::cerr << "known bits:" << std::endl;
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std::cerr << std::setw(5) << 0 << " - ";
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for (auto i : bitdata)
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std::cout << (i > 0 ? "1" : "0");
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std::cerr << std::endl;
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std::cerr << "demod tests sigproclib:" << std::endl;
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auto ct = CorrType::TSC;
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auto delay = 0;
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auto tsc = 7;
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int offset = 0;
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auto cplx = reinterpret_cast<complex *>(&burstdata[offset]);
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auto stdcplx = reinterpret_cast<std::complex<float> *>(&burstdata[offset]);
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signalVector sv(&cplx[0], 0, burstdata.size() - offset, dummy_alloc, dummy_free);
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struct estim_burst_params ebp;
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auto rc = detectAnyBurst(sv, tsc, BURST_THRESH, 4, ct, 40, &ebp);
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auto rxBurst = std::unique_ptr<SoftVector>(demodAnyBurst(sv, (CorrType)rc, 4, &ebp));
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// print osmotrx sigproclib demod result
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std::cerr << std::setw(5) << int(ebp.toa) << " o ";
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for (ssize_t i = 0 + delay; i < 148 + delay; i++)
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std::cout << (rxBurst->bit(i) ? "1" : "0");
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std::cerr << std::endl;
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std::cerr << "demod test va:" << std::endl;
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std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
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float ncmax;
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char demodded_softbits[444];
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// demod at known offset
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{
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auto inp = &stdcplx[29]; // known offset
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auto normal_burst_startX = get_norm_chan_imp_resp(inp, &chan_imp_resp[0], &ncmax, tsc);
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detect_burst_nb(inp, &chan_imp_resp[0], normal_burst_startX, demodded_softbits);
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std::cerr << std::setw(5) << normal_burst_startX << " v ";
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for (size_t i = 0; i < 148; i++)
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std::cerr << (demodded_softbits[i] < 0 ? "1" : "0");
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std::cerr << std::endl;
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}
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{
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std::cerr << "-- va start offset loop --" << std::endl;
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std::cerr << "offset/det offset/#errors/known^demod bits" << std::endl;
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for (int i = 0; i < 34; i++) {
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auto inp = &stdcplx[i];
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auto conved_beg = inp;
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auto me = get_norm_chan_imp_resp(conved_beg, &chan_imp_resp[0], &ncmax, tsc);
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detect_burst_nb(conved_beg, &chan_imp_resp[0], me, demodded_softbits);
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auto bitdiffarr = std::make_unique<char[]>(148);
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for (size_t i = 0; i < 148; i++)
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bitdiffarr.get()[i] = (demodded_softbits[i] < 0 ? 1 : 0) ^ (bitdata[i] > 0 ? 1 : 0);
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auto ber = std::accumulate(bitdiffarr.get(), bitdiffarr.get() + 148, 0);
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std::cerr << std::setw(3) << i << ": " << std::setw(3) << me << " v " << std::setw(3) << ber
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<< " ";
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for (size_t i = 0; i < 148; i++)
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std::cerr << (bitdiffarr[i] ? "1" : "0");
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std::cerr << std::endl;
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// std::cerr << std::setw(4) << i << " (" << std::setw(4) << 29 - i << "):" << std::setw(4) << org
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// << " " << std::setw(4) << me << " y " << std::endl;
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}
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}
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}
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auto gen_burst(CorrType t, int delay, int tsc)
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{
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mrv rs;
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if (t == CorrType::RACH) {
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rs = genRandAccessBurstx(delay, 4, tsc);
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} else if (t == CorrType::TSC) {
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rs = genRandNormalBurstx(tsc, 4, 0);
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} else {
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std::cerr << "wtf?" << std::endl;
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exit(0);
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}
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rs.ct = t;
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signalVector *burst = rs.rvbuf;
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// sv_write_helper(burst, std::to_string(num));
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// scaleVector(*burst, {1, 0});
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const int len_in_real = burst->size() * 2;
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auto cvrtbuf_tx_a = std::make_unique<short[]>(len_in_real);
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auto cvrtbuf_rx_a = std::make_unique<float[]>(len_in_real);
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auto rx_cfloat = reinterpret_cast<std::complex<float> *>(&cvrtbuf_rx_a[0]);
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convert_float_short(cvrtbuf_tx_a.get(), (float *)burst->begin(), float(txFullScale), len_in_real);
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convert_short_float(cvrtbuf_rx_a.get(), cvrtbuf_tx_a.get(), len_in_real);
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for (int i = 0; i < len_in_real; i++) // scale properly!
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cvrtbuf_rx_a[i] *= 1. / txFullScale;
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auto conved = conv(rx_cfloat, burst->size(), chan_im_resp);
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std::cerr << "-- generated " << (t == CorrType::RACH ? "RACH" : "TSC") << " burst --" << std::endl;
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for (size_t i = 0; i < rs.bits.size(); i++)
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std::cerr << (rs.bits[i] ? "1" : "0");
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std::cerr << std::endl;
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delete burst;
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rs.convolved = std::move(conved);
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return rs;
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}
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void demod_generated_burst(CorrType t)
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{
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int tsc = 0;
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int delay = 0;
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auto rs = gen_burst(t, delay, tsc);
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auto conved_beg = &(*rs.convolved)[0];
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if (rs.ct == CorrType::RACH) {
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std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
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float ncmax;
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char demodded_softbits[444];
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int normal_burst_start = 0;
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normal_burst_start = get_access_imp_resp(conved_beg, &chan_imp_resp[0], &ncmax, 0);
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normal_burst_start = std::max(normal_burst_start, 0);
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for (int j = 0; j < 4; j++) {
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for (int start_val = 0; start_val < 16; start_val++) {
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auto bitdiffarr = std::make_unique<char[]>(rs.bits.size());
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detect_burst_ab(conved_beg, &chan_imp_resp[0], normal_burst_start + j,
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demodded_softbits, start_val);
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for (size_t i = 0; i < rs.bits.size(); i++)
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bitdiffarr.get()[i] = (demodded_softbits[i] < 0 ? 1 : 0) ^ rs.bits[i];
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auto ber = std::accumulate(bitdiffarr.get(), bitdiffarr.get() + rs.bits.size(), 0);
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std::cerr << "ber " << std::setw(4) << ber << " bo:" << std::setw(4) << j
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<< " vas:" << std::setw(4) << start_val << " ";
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// for (size_t i = 0; i < rs.num_bits; i++)
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// std::cerr << (demodded_softbits[i] < 0 ? "1" : "0");
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// std::cerr << std::endl;
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// std::cerr << "d " << std::setw(4) << ber << " ";
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for (size_t i = 0; i < rs.bits.size(); i++)
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std::cerr << (bitdiffarr.get()[i] ? "1" : "0");
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std::cerr << std::endl;
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// std::cerr << "v " << std::setw(4) << j << std::setw(4) << start_val << " ";
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// for (size_t i = 0; i < rs.num_bits; i++)
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// std::cerr << (demodded_softbits[i] < 0 ? "1" : "0");
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// std::cerr << std::endl;
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// std::cerr << "d " << std::setw(4) << ber << " ";
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// for (size_t i = 0; i < rs.num_bits; i++)
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// std::cerr << (ptr.get()[i] ? "1" : "0");
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// std::cerr << std::endl;
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}
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}
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} else {
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std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
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float ncmax;
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char demodded_softbits[444];
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auto normal_burst_start = get_norm_chan_imp_resp(conved_beg, &chan_imp_resp[0], &ncmax, tsc);
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detect_burst_nb(conved_beg, &chan_imp_resp[0], normal_burst_start + 0, demodded_softbits);
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std::cerr << "toa " << std::setprecision(2) << normal_burst_start << std::endl;
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std::cerr << "vita ";
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for (size_t i = 0; i < rs.bits.size(); i++)
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std::cerr << (demodded_softbits[i] < 0 ? "1" : "0");
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std::cerr << std::endl;
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std::cerr << "diff ";
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for (size_t i = 0; i < rs.bits.size(); i++)
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std::cerr << ((demodded_softbits[i] < 0 ? 1 : 0) ^ rs.bits[i] ? "1" : "0");
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std::cerr << std::endl;
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}
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struct estim_burst_params ebp;
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char demodded_softbits[444];
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complex *rx_sigproc_cfloat = reinterpret_cast<complex *>(conved_beg);
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signalVector sv(rx_sigproc_cfloat, 0, rs.convolved->size(), dummy_alloc, dummy_free);
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auto rc = detectAnyBurst(sv, tsc, BURST_THRESH, 4, rs.ct, 40, &ebp);
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auto rxBurst = std::unique_ptr<SoftVector>(demodAnyBurst(sv, (CorrType)rc, 4, &ebp));
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std::cerr << "toa " << std::setprecision(2) << ebp.toa << std::endl;
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for (ssize_t i = 0; i < delay; i++) // maybe pad rach op?
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demodded_softbits[i] = 0;
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for (size_t i = 0 + delay; i < rs.bits.size() + delay; i++)
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demodded_softbits[i] = (rxBurst->bit(i) ? 1 : 0);
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|
|
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std::cerr << "sigp ";
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for (size_t i = 0; i < rs.bits.size(); i++)
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std::cerr << (demodded_softbits[i] ? "1" : "0");
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std::cerr << std::endl;
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|
|
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std::cerr << "diff ";
|
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for (size_t i = 0; i < rs.bits.size(); i++)
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std::cerr << (demodded_softbits[i] ^ rs.bits[i] ? "1" : "0");
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std::cerr << std::endl;
|
|
}
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|
|
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void demod_test_offsets()
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{
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const int tsc = 0;
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const int delaybuffer_realoffset = 100;
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|
|
|
{
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auto rs = gen_burst(CorrType::RACH, 0, tsc);
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|
typeof(*rs.convolved) delay_buffer(rs.convolved->size() * 2); // plenty of space..
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|
|
|
for (int delay = -10; delay < 60; delay++) {
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std::fill(delay_buffer.begin(), delay_buffer.end(), 0);
|
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std::copy(rs.convolved->begin(), rs.convolved->end(),
|
|
delay_buffer.begin() + delaybuffer_realoffset + delay);
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|
|
|
auto conved_beg = &delay_buffer[delaybuffer_realoffset];
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|
|
|
std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
|
|
float ncmax;
|
|
auto va_burst_start = get_access_imp_resp(conved_beg, &chan_imp_resp[0], &ncmax, 60);
|
|
|
|
complex *rx_sigproc_cfloat = reinterpret_cast<complex *>(conved_beg);
|
|
struct estim_burst_params ebp;
|
|
signalVector sv(rx_sigproc_cfloat, 0, rs.convolved->size(), dummy_alloc, dummy_free);
|
|
detectAnyBurst(sv, tsc, BURST_THRESH, 4, rs.ct, 60, &ebp);
|
|
std::cerr << "delay:" << std::setw(3) << std::setprecision(2) << delay;
|
|
std::cerr << " va: " << std::setw(3) << std::setprecision(2) << va_burst_start;
|
|
std::cerr << " sg: " << std::setw(3) << std::setprecision(2) << ebp.toa;
|
|
std::cerr << " d: " << std::setw(3) << std::setprecision(2) << (ebp.toa * 4) - va_burst_start;
|
|
std::cerr << " ! " << float(va_burst_start + 13) / 4 << std::endl;
|
|
}
|
|
}
|
|
{
|
|
auto rs = gen_burst(CorrType::TSC, 0, tsc);
|
|
typeof(*rs.convolved) delay_buffer(rs.convolved->size() * 2); // plenty of space..
|
|
|
|
for (int delay = -10; delay < 10; delay++) {
|
|
std::fill(delay_buffer.begin(), delay_buffer.end(), 0);
|
|
std::copy(rs.convolved->begin(), rs.convolved->end(),
|
|
delay_buffer.begin() + delaybuffer_realoffset + delay);
|
|
|
|
auto conved_beg = &delay_buffer[delaybuffer_realoffset];
|
|
|
|
std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
|
|
float ncmax;
|
|
auto va_burst_start = get_norm_chan_imp_resp(conved_beg, &chan_imp_resp[0], &ncmax, tsc);
|
|
|
|
complex *rx_sigproc_cfloat = reinterpret_cast<complex *>(conved_beg);
|
|
struct estim_burst_params ebp;
|
|
signalVector sv(rx_sigproc_cfloat, 0, rs.convolved->size(), dummy_alloc, dummy_free);
|
|
detectAnyBurst(sv, tsc, BURST_THRESH, 4, rs.ct, 60, &ebp);
|
|
std::cerr << "delay:" << std::setw(3) << std::setprecision(2) << delay;
|
|
std::cerr << " va: " << std::setw(3) << std::setprecision(2) << va_burst_start;
|
|
std::cerr << " sg: " << std::setw(3) << std::setprecision(2) << ebp.toa;
|
|
std::cerr << " d: " << std::setw(3) << std::setprecision(2) << (ebp.toa * 4) - va_burst_start;
|
|
std::cerr << " ! " << float(va_burst_start + 19) / 4 << std::endl;
|
|
}
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
convolve_init();
|
|
convert_init();
|
|
sigProcLibSetup();
|
|
initvita();
|
|
|
|
for (int i = 0; i < 1; i++) {
|
|
demod_real_burst(i);
|
|
demod_generated_burst(CorrType::RACH);
|
|
demod_generated_burst(CorrType::TSC);
|
|
demod_test_offsets();
|
|
}
|
|
}
|