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|
# snr_curves.sh
#
# Library of bash functions to generate data for SNR curves.
#
# testing a function example:
# $ bash -c "source ./snr_curves.sh; generate_octave_tx_data datac0 awgn"
set -x
PATH=${PATH}:${HOME}/codec2/build_linux/src
CODEC2=${HOME}/codec2
FADING_DIR=${CODEC2}/build_linux/unittest
snr_list='-5 -4 -3 -2 0 1 2 4'
No_list='-13 -14 -15 -16 -18 -20 -22 -24 -26'
Nbursts_awgn=20
Nbursts_mpp=100
# Octave Tx injects noise and is source of truth for SNR, measure BER/PER v SNR
function generate_octave_tx_data {
mode=$1
channel=$2
Nbursts=$Nbursts_awgn
snr_nudge=0
if [ "$channel" == "mpp" ]; then
Nbursts=$Nbursts_mpp
snr_nudge=4
fi
rx_log=$(mktemp)
i=1
rm -f snr_oct_${mode}_${channel}*.txt
rm -f ber_oct_${mode}_${channel}*.txt
rm -f per_oct_${mode}_${channel}*.txt
for snr in $snr_list
do
snr_adj=$((${snr}+${snr_nudge}))
echo "warning ('off', 'Octave:data-file-in-path');
ofdm_ldpc_tx('test_${mode}.raw','${mode}',1,${snr_adj},'${channel}','bursts',${Nbursts},'crc');
quit" | DISPLAY="" octave-cli -p ${CODEC2}/octave
freedv_data_raw_rx --testframes $mode test_${mode}.raw /dev/null 2>${rx_log} -v
BERmeas=$(cat ${rx_log} | grep 'BER......:' | cut -d' ' -f2)
PERmeas=$(cat ${rx_log} | grep 'Coded FER' | cut -d' ' -f3)
echo ${snr_adj} >> snr_oct_${mode}_${channel}.txt
echo ${BERmeas} >> ber_oct_${mode}_${channel}.txt
echo ${PERmeas} >> per_oct_${mode}_${channel}.txt
i=$((i+1))
done
echo 0 > offset_oct_${mode}_${channel}.txt
}
# ch injects noise and is source of truth for SNR, measure BER/PER v SNR
# Octave Tx
function generate_ch_data {
mode=$1
channel=$2
ch_multipath=''
Nbursts=$Nbursts_awgn
snr_nudge=0
if [ "$channel" == "mpp" ]; then
ch_multipath='--mpp'
Nbursts=$Nbursts_mpp
snr_nudge=4
fi
octave_log=$(mktemp)
ch_log=$(mktemp)
rx_log=$(mktemp)
i=1
rm -f snr_ch_${mode}_${channel}*.txt
rm -f ber_ch_${mode}_${channel}*.txt
rm -f per_ch_${mode}_${channel}*.txt
for No in $No_list
do
No_adj=$((${No}-${snr_nudge}))
echo "warning ('off', 'Octave:data-file-in-path');
ofdm_ldpc_tx('test_${mode}.raw','${mode}',1,100,'awgn','bursts',${Nbursts},'crc');
quit" | DISPLAY="" octave-cli -p ${CODEC2}/octave 1>${octave_log}
SNRoffset=$(cat ${octave_log} | grep 'Burst offset:' | cut -d' ' -f5)
ch test_${mode}.raw - --No $No_adj ${ch_multipath} --fading_dir ${FADING_DIR} 2>>${ch_log} | \
freedv_data_raw_rx --testframes $mode - /dev/null -v 2>${rx_log}
BERmeas=$(cat ${rx_log} | grep 'BER......:' | cut -d' ' -f2)
PERmeas=$(cat ${rx_log} | grep 'Coded FER' | cut -d' ' -f3)
echo ${BERmeas} >> ber_ch_${mode}_${channel}.txt
echo ${PERmeas} >> per_ch_${mode}_${channel}.txt
i=$((i+1))
# trap not enough fading file samples (with mpp)
grep "Fading file finished" ${ch_log}
if [ $? -eq 0 ]; then
cat ${ch_log}
exit 1
fi
done
echo ${SNRoffset} > offset_ch_${mode}_${channel}.txt
SNRch=$(cat ${ch_log} | grep SNR3k | tr -s ' ' | cut -d' ' -f3)
echo ${SNRch} > snr_ch_${mode}_${channel}.txt
}
# ch injects noise and is source of truth for SNR, measure BER/PER v SNR and
# SNR estimates v SNR from rx, C Tx
function generate_snrest_v_snr_data {
mode=$1
channel=$2
snr_nudge=0
aNo_list=$No_list
# nudge SNR test range to get meaningful results for these tests
if [ "$mode" == "datac1" ]; then
snr_nudge=4
fi
if [[ "$mode" == "datac4" || "$mode" == "datac13" || "$mode" == "datac14" ]]; then
snr_nudge=-6
fi
ch_multipath=''
Nbursts=$Nbursts_awgn
if [ "$channel" == "mpp" ]; then
ch_multipath='--mpp'
Nbursts=$Nbursts_mpp
snr_nudge=$((${snr_nudge}+4))
fi
clip=0
id='ctx'
if [ "$#" -eq 3 ]; then
clip=$3
id='ctxc'
snr_nudge=$((${snr_nudge}-4))
fi
tx_log=$(mktemp)
ch_log=$(mktemp)
rx_log=$(mktemp)
i=1
rm -f snrest_${id}_${mode}_${channel}*.txt
rm -f ber_${id}_${mode}_${channel}*.txt
rm -f per_${id}_${mode}_${channel}*.txt
for No in $aNo_list
do
No_adj=$((${No}-${snr_nudge}))
freedv_data_raw_tx --clip ${clip} --delay 1000 --txbpf ${clip} --bursts $Nbursts --testframes $Nbursts $mode /dev/zero - 2>${tx_log} | \
ch - - --No $No_adj ${ch_multipath} --fading_dir ${FADING_DIR} 2>>${ch_log} | \
freedv_data_raw_rx --testframes $mode - /dev/null 2>${rx_log} -v
SNRoffset=$(cat ${tx_log} | grep "mark:space" | tr -s ' ' | cut -d' ' -f 5)
SNRest=$(cat ${rx_log} | grep '\-BS\-' | tr -s ' ' | cut -d' ' -f17)
if [ ! -z "$SNRest" ]; then
echo ${SNRest} > snrest_${id}_${mode}_${channel}_${i}.txt
fi
BERmeas=$(cat ${rx_log} | grep 'BER......:' | cut -d' ' -f2)
PERmeas=$(cat ${rx_log} | grep 'Coded FER' | cut -d' ' -f3)
echo ${BERmeas} >> ber_${id}_${mode}_${channel}.txt
echo ${PERmeas} >> per_${id}_${mode}_${channel}.txt
i=$((i+1))
done
echo ${SNRoffset} > offset_${id}_${mode}_${channel}.txt
# trap not enough fading file samples (with mpp)
grep "Fading file finished" ${ch_log}
if [ $? -eq 0 ]; then
cat ${ch_log}
exit 1
fi
SNRch=$(cat ${ch_log} | grep SNR3k | tr -s ' ' | cut -d' ' -f3)
echo ${SNRch} > snr_${id}_${mode}_${channel}.txt
}
# Sanity check to make sure Octave/CML is set up OK
function test_ldpc {
echo "ldpcut; quit" | DISPLAY="" octave-cli -p ${CODEC2}/octave
if [ "$?" -ne 0 ]; then
echo "basic octave test failed, you may need to"
echo "(a) run ctests to create build_xxx/cml"
echo "(b) set up ~/.octaverc as per octave/ldpc.m"
exit 1
else
echo "OK"
fi
}
|
