mirror of https://github.com/pvnis/srsRAN_4G.git
Add PDSCH and TDEC MEX test
ismagom
10 years ago
parent
2afdb97b1f
commit
d993021880
@ -0,0 +1,107 @@
|
||||
/**
|
||||
*
|
||||
* \section COPYRIGHT
|
||||
*
|
||||
* Copyright 2013-2014 The libLTE Developers. See the
|
||||
* COPYRIGHT file at the top-level directory of this distribution.
|
||||
*
|
||||
* \section LICENSE
|
||||
*
|
||||
* This file is part of the libLTE library.
|
||||
*
|
||||
* libLTE is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation, either version 3 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* libLTE is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU Lesser General Public License for more details.
|
||||
*
|
||||
* A copy of the GNU Lesser General Public License can be found in
|
||||
* the LICENSE file in the top-level directory of this distribution
|
||||
* and at http://www.gnu.org/licenses/.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
#include "liblte/phy/phy.h"
|
||||
#include "liblte/mex/mexutils.h"
|
||||
|
||||
/** MEX function to be called from MATLAB to test the channel estimator
|
||||
*/
|
||||
|
||||
#define INPUT prhs[0]
|
||||
#define NITERS prhs[1]
|
||||
#define NOF_INPUTS 1
|
||||
|
||||
|
||||
void help()
|
||||
{
|
||||
mexErrMsgTxt
|
||||
("[decoded_bits] = liblte_turbodecoder(input_llr, nof_iterations)\n\n");
|
||||
}
|
||||
|
||||
/* the gateway function */
|
||||
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
|
||||
{
|
||||
|
||||
tdec_t tdec;
|
||||
float *input_llr;
|
||||
uint8_t *output_data;
|
||||
uint32_t nof_bits;
|
||||
uint32_t nof_iterations;
|
||||
|
||||
if (nrhs < NOF_INPUTS) {
|
||||
help();
|
||||
return;
|
||||
}
|
||||
|
||||
// Read input symbols
|
||||
uint32_t nof_symbols = mexutils_read_f(INPUT, &input_llr);
|
||||
if (nof_symbols < 40) {
|
||||
mexErrMsgTxt("Minimum block size is 40\n");
|
||||
return;
|
||||
}
|
||||
nof_bits = (nof_symbols-12)/3;
|
||||
|
||||
if (!lte_cb_size_isvalid(nof_bits)) {
|
||||
mexErrMsgTxt("Invalid codeblock size\n");
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
// read number of iterations
|
||||
if (nrhs > NOF_INPUTS) {
|
||||
nof_iterations = (uint32_t) mxGetScalar(prhs[1]);
|
||||
if (nof_iterations > 50) {
|
||||
mexErrMsgTxt("Maximum number of iterations is 50\n");
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
nof_iterations = 5; // set the default nof iterations to 5 as in matlab
|
||||
}
|
||||
|
||||
// allocate memory for output bits
|
||||
output_data = vec_malloc(nof_bits * sizeof(uint8_t));
|
||||
|
||||
if (tdec_init(&tdec, nof_bits)) {
|
||||
mexErrMsgTxt("Error initiating Turbo decoder\n");
|
||||
return;
|
||||
}
|
||||
|
||||
tdec_run_all(&tdec, input_llr, output_data, nof_iterations, nof_bits);
|
||||
|
||||
if (nlhs >= 1) {
|
||||
mexutils_write_uint8(output_data, &plhs[0], nof_bits, 1);
|
||||
}
|
||||
|
||||
tdec_free(&tdec);
|
||||
|
||||
free(input_llr);
|
||||
free(output_data);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
@ -0,0 +1,196 @@
|
||||
/**
|
||||
*
|
||||
* \section COPYRIGHT
|
||||
*
|
||||
* Copyright 2013-2014 The libLTE Developers. See the
|
||||
* COPYRIGHT file at the top-level directory of this distribution.
|
||||
*
|
||||
* \section LICENSE
|
||||
*
|
||||
* This file is part of the libLTE library.
|
||||
*
|
||||
* libLTE is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation, either version 3 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* libLTE is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU Lesser General Public License for more details.
|
||||
*
|
||||
* A copy of the GNU Lesser General Public License can be found in
|
||||
* the LICENSE file in the top-level directory of this distribution
|
||||
* and at http://www.gnu.org/licenses/.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
#include "liblte/phy/phy.h"
|
||||
#include "liblte/mex/mexutils.h"
|
||||
|
||||
/** MEX function to be called from MATLAB to test the channel estimator
|
||||
*/
|
||||
|
||||
#define ENBCFG prhs[0]
|
||||
#define RNTI prhs[1]
|
||||
#define TBS prhs[2]
|
||||
#define INPUT prhs[3]
|
||||
#define NOF_INPUTS 4
|
||||
|
||||
void help()
|
||||
{
|
||||
mexErrMsgTxt
|
||||
("[decoded_ok, llr, rm, bits, symbols] = liblte_pdsch(enbConfig, RNTI, rxWaveform)\n\n");
|
||||
}
|
||||
|
||||
/* the gateway function */
|
||||
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
|
||||
{
|
||||
int i;
|
||||
lte_cell_t cell;
|
||||
pdsch_t pdsch;
|
||||
chest_dl_t chest;
|
||||
lte_fft_t fft;
|
||||
uint32_t cfi, sf_idx;
|
||||
uint16_t rnti;
|
||||
cf_t *input_fft, *input_signal;
|
||||
int nof_re;
|
||||
ra_mcs_t mcs;
|
||||
ra_prb_t prb_alloc;
|
||||
pdsch_harq_t harq_process;
|
||||
uint32_t rv;
|
||||
|
||||
if (nrhs != NOF_INPUTS) {
|
||||
help();
|
||||
return;
|
||||
}
|
||||
|
||||
if (mexutils_read_cell(ENBCFG, &cell)) {
|
||||
help();
|
||||
return;
|
||||
}
|
||||
|
||||
if (mexutils_read_uint32_struct(ENBCFG, "CFI", &cfi)) {
|
||||
help();
|
||||
return;
|
||||
}
|
||||
if (mexutils_read_uint32_struct(ENBCFG, "NSubframe", &sf_idx)) {
|
||||
help();
|
||||
return;
|
||||
}
|
||||
|
||||
if (chest_dl_init(&chest, cell)) {
|
||||
fprintf(stderr, "Error initializing equalizer\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (lte_fft_init(&fft, cell.cp, cell.nof_prb)) {
|
||||
fprintf(stderr, "Error initializing FFT\n");
|
||||
return;
|
||||
}
|
||||
|
||||
rnti = (uint16_t) mxGetScalar(RNTI);
|
||||
|
||||
nof_re = 2 * CPNORM_NSYMB * cell.nof_prb * RE_X_RB;
|
||||
|
||||
mcs.tbs = mxGetScalar(TBS);
|
||||
mcs.mod = modulation;
|
||||
|
||||
if (mexutils_read_uint32_struct(ENBCFG, "NSubframe", &sf_idx)) {
|
||||
help();
|
||||
return;
|
||||
}
|
||||
|
||||
prb_alloc.slot[0].nof_prb = cell.nof_prb;
|
||||
for (i=0;i<prb_alloc.slot[0].nof_prb;i++) {
|
||||
prb_alloc.slot[0].prb_idx[i] = i;
|
||||
}
|
||||
memcpy(&prb_alloc.slot[1], &prb_alloc.slot[0], sizeof(ra_prb_slot_t));
|
||||
|
||||
ra_prb_get_re_dl(&prb_alloc, cell.nof_prb, cell.nof_ports, 2, CPNORM);
|
||||
|
||||
/** Allocate input buffers */
|
||||
if (mexutils_read_cf(INPUT, &input_signal) < 0) {
|
||||
mexErrMsgTxt("Error reading input signal\n");
|
||||
return;
|
||||
}
|
||||
input_fft = vec_malloc(SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
|
||||
|
||||
// Set Channel estimates to 1.0 (ignore fading)
|
||||
cf_t *ce[MAX_PORTS];
|
||||
for (i=0;i<cell.nof_ports;i++) {
|
||||
ce[i] = vec_malloc(SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
|
||||
}
|
||||
|
||||
lte_fft_run_sf(&fft, input_signal, input_fft);
|
||||
|
||||
if (nrhs > NOF_INPUTS) {
|
||||
cf_t *cearray;
|
||||
nof_re = mexutils_read_cf(prhs[NOF_INPUTS], &cearray);
|
||||
for (i=0;i<cell.nof_ports;i++) {
|
||||
for (int j=0;j<nof_re;j++) {
|
||||
ce[i][j] = *cearray;
|
||||
cearray++;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
chest_dl_estimate(&chest, input_fft, ce, sf_idx);
|
||||
}
|
||||
float noise_power;
|
||||
if (nrhs > NOF_INPUTS + 1) {
|
||||
noise_power = mxGetScalar(prhs[NOF_INPUTS+1]);
|
||||
} else {
|
||||
noise_power = chest_dl_get_noise_estimate(&chest);
|
||||
}
|
||||
|
||||
pdcch_extract_llr(&pdcch, input_fft, ce, noise_power, sf_idx, cfi);
|
||||
|
||||
uint32_t nof_locations;
|
||||
if (rnti == SIRNTI) {
|
||||
nof_locations = pdcch_common_locations(&pdcch, locations, MAX_CANDIDATES, cfi);
|
||||
formats = common_formats;
|
||||
nof_formats = nof_common_formats;
|
||||
} else {
|
||||
nof_locations = pdcch_ue_locations(&pdcch, locations, MAX_CANDIDATES, sf_idx, cfi, rnti);
|
||||
formats = ue_formats;
|
||||
nof_formats = nof_ue_formats;
|
||||
}
|
||||
uint16_t crc_rem=0;
|
||||
dci_msg_t dci_msg;
|
||||
bzero(&dci_msg, sizeof(dci_msg_t));
|
||||
|
||||
for (int f=0;f<nof_formats;f++) {
|
||||
for (i=0;i<nof_locations && crc_rem != rnti;i++) {
|
||||
if (pdcch_decode_msg(&pdcch, &dci_msg, &locations[i], formats[f], &crc_rem)) {
|
||||
fprintf(stderr, "Error decoding DCI msg\n");
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (nlhs >= 1) {
|
||||
plhs[0] = mxCreateLogicalScalar(crc_rem == rnti);
|
||||
}
|
||||
int nof_bits = (regs_pdcch_nregs(®s, cfi) / 9) * 72;
|
||||
if (nlhs >= 2) {
|
||||
mexutils_write_f(pdcch.pdcch_llr, &plhs[1], nof_bits, 1);
|
||||
}
|
||||
if (nlhs >= 3) {
|
||||
mexutils_write_cf(pdcch.pdcch_symbols[0], &plhs[2], 36*pdcch.nof_cce, 1);
|
||||
}
|
||||
|
||||
chest_dl_free(&chest);
|
||||
lte_fft_free(&fft);
|
||||
pdcch_free(&pdcch);
|
||||
regs_free(®s);
|
||||
|
||||
for (i=0;i<cell.nof_ports;i++) {
|
||||
free(ce[i]);
|
||||
}
|
||||
free(input_signal);
|
||||
free(input_fft);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
@ -0,0 +1,95 @@
|
||||
%% PDSCH decoding based on RMC channels
|
||||
|
||||
%% Cell-Wide Settings
|
||||
% A structure |enbConfig| is used to configure the eNodeB.
|
||||
clear
|
||||
|
||||
Npackets = 25;
|
||||
SNR_values = linspace(1,6,4);
|
||||
|
||||
%% Choose RMC
|
||||
[waveform,rgrid,rmccFgOut] = lteRMCDLTool('R.12',[1;0;0;1]);
|
||||
waveform = sum(waveform,2);
|
||||
|
||||
Nsf = 8;
|
||||
|
||||
%% Setup Fading channel model
|
||||
cfg.Seed = 8; % Random channel seed
|
||||
cfg.NRxAnts = 1; % 1 receive antenna
|
||||
cfg.DelayProfile = 'EPA'; % EVA delay spread
|
||||
cfg.DopplerFreq = 5; % 120Hz Doppler frequency
|
||||
cfg.MIMOCorrelation = 'Low'; % Low (no) MIMO correlation
|
||||
cfg.InitTime = 0; % Initialize at time zero
|
||||
cfg.NTerms = 16; % Oscillators used in fading model
|
||||
cfg.ModelType = 'GMEDS'; % Rayleigh fading model type
|
||||
cfg.InitPhase = 'Random'; % Random initial phases
|
||||
cfg.NormalizePathGains = 'On'; % Normalize delay profile power
|
||||
cfg.NormalizeTxAnts = 'On'; % Normalize for transmit antennas
|
||||
cfg.SamplingRate = rmccFgOut.SamplingRate;
|
||||
|
||||
% Setup channel equalizer
|
||||
cec.PilotAverage = 'UserDefined'; % Type of pilot averaging
|
||||
cec.FreqWindow = 9; % Frequency window size
|
||||
cec.TimeWindow = 9; % Time window size
|
||||
cec.InterpType = 'linear'; % 2D interpolation type
|
||||
cec.InterpWindow = 'Centered'; % Interpolation window type
|
||||
cec.InterpWinSize = 1; % Interpolation window size
|
||||
|
||||
addpath('../../debug/lte/phy/lib/phch/test')
|
||||
|
||||
decoded = zeros(size(SNR_values));
|
||||
decoded_liblte = zeros(size(SNR_values));
|
||||
|
||||
for snr_idx=1:length(SNR_values)
|
||||
SNRdB = SNR_values(snr_idx);
|
||||
SNR = 10^(SNRdB/10); % Linear SNR
|
||||
N0 = 1/(sqrt(2.0*rmccFgOut.CellRefP*double(rmccFgOut.Nfft))*SNR);
|
||||
for i=1:Npackets
|
||||
|
||||
%% Fading
|
||||
rxWaveform = lteFadingChannel(cfg,waveform);
|
||||
|
||||
%% Noise Addition
|
||||
noise = N0*complex(randn(size(rxWaveform)), randn(size(rxWaveform))); % Generate noise
|
||||
rxWaveform = rxWaveform + noise;
|
||||
|
||||
%% Demodulate
|
||||
frame_rx = lteOFDMDemodulate(rmccFgOut, rxWaveform);
|
||||
|
||||
for sf_idx=0:Nsf
|
||||
|
||||
subframe_rx=frame_rx(:,sf_idx*14+1:(sf_idx+1)*14);
|
||||
rmccFgOut.NSubframe=sf_idx;
|
||||
rmccFgOut.TotSubframes=1;
|
||||
|
||||
% Perform channel estimation
|
||||
[hest, nest] = lteDLChannelEstimate(rmccFgOut, cec, subframe_rx);
|
||||
|
||||
[cws,symbols] = ltePDSCHDecode(rmccFgOut,rmccFgOut.PDSCH,subframe_rx,hest,nest);
|
||||
[trblkout,blkcrc] = lteDLSCHDecode(rmccFgOut,rmccFgOut.PDSCH, ...
|
||||
rmccFgOut.PDSCH.TrBlkSizes(sf_idx+1),cws);
|
||||
|
||||
decoded(snr_idx) = decoded(snr_idx) + ~blkcrc;
|
||||
|
||||
|
||||
%% Same with libLTE
|
||||
%[found_liblte, llr, pdcchSymbols2] = liblte_pdsch(rmccFgOut, ueConfig.RNTI, rxWaveform);
|
||||
%decoded_liblte(snr_idx) = decoded_liblte(snr_idx)+found_liblte;
|
||||
end
|
||||
end
|
||||
fprintf('SNR: %.1f\n',SNRdB)
|
||||
end
|
||||
|
||||
if (length(SNR_values)>1)
|
||||
semilogy(SNR_values,1-decoded/Npackets/(Nsf+1),'bo-',...
|
||||
SNR_values,1-decoded_liblte/Npackets/(Nsf+1), 'ro-')
|
||||
grid on;
|
||||
legend('Matlab','libLTE')
|
||||
xlabel('SNR (dB)')
|
||||
ylabel('BLER')
|
||||
axis([min(SNR_values) max(SNR_values) 1/Npackets/(Nsf+1) 1])
|
||||
else
|
||||
disp(decoded)
|
||||
disp(decoded_liblte)
|
||||
end
|
||||
|
||||
@ -0,0 +1,50 @@
|
||||
|
||||
clear
|
||||
blen=1008;
|
||||
SNR_values_db=linspace(-1,0.5,6);
|
||||
Nrealizations=10000;
|
||||
|
||||
addpath('../../debug/lte/phy/lib/fec/test')
|
||||
|
||||
errors1=zeros(1,length(SNR_values_db));
|
||||
errors2=zeros(1,length(SNR_values_db));
|
||||
for snr_idx=1:length(SNR_values_db)
|
||||
SNRdB = SNR_values_db(snr_idx); % Desired SNR in dB
|
||||
SNR = 10^(SNRdB/20); % Linear SNR
|
||||
|
||||
for i=1:Nrealizations
|
||||
Data = randi(2,blen,1)==1;
|
||||
codedData = lteTurboEncode(Data);
|
||||
|
||||
codedsymbols = 2*double(codedData)-1;
|
||||
|
||||
%% Additive Noise
|
||||
N0 = 1/SNR;
|
||||
|
||||
% Create additive white Gaussian noise
|
||||
noise = N0*randn(size(codedsymbols));
|
||||
|
||||
noisysymbols = noise + codedsymbols;
|
||||
|
||||
decodedData = lteTurboDecode(noisysymbols);
|
||||
interleavedSymbols = reshape(reshape(noisysymbols,[],3)',1,[]);
|
||||
[decodedData2] = liblte_turbodecoder(interleavedSymbols);
|
||||
|
||||
errors1(snr_idx) = errors1(snr_idx) + any(decodedData ~= Data);
|
||||
errors2(snr_idx) = errors2(snr_idx) + any(decodedData2 ~= Data);
|
||||
end
|
||||
|
||||
fprintf('SNR: %.2f\n', SNR_values_db(snr_idx));
|
||||
end
|
||||
|
||||
if (length(SNR_values_db) > 1)
|
||||
semilogy(SNR_values_db, errors1/Nrealizations, ...
|
||||
SNR_values_db, errors2/Nrealizations)
|
||||
grid on
|
||||
xlabel('SNR (dB)')
|
||||
ylabel('BLER')
|
||||
legend('Matlab','libLTE');
|
||||
else
|
||||
disp(errors1);
|
||||
disp(errors2);
|
||||
end
|
||||
Loading…
Reference in New Issue