csdr/grc_tests/bpsk31_ber.py
2017-06-14 11:57:32 +02:00

53 lines
1.7 KiB
Python
Executable file

#!/usr/bin/python
import os, time, signal
from subprocess import *
#https://bugs.python.org/issue1652
def p(x):
global printcmds
if printcmds: print x
return check_output(x, shell=True)
printcmds=True
def genfiles(snr):
cmd="""(while true; do echo -n 'CQ CQ CQ DE HA7ILM HA7ILM HA7ILM PSE K '; done) | \
csdr psk31_varicode_encoder_u8_u8 | \
tee /s/bpsk31_testin | \
csdr differential_encoder_u8_u8 | \
csdr psk_modulator_u8_c 2 | \
csdr psk31_interpolate_sine_cc 256 | \
csdr awgn_cc %d | \
csdr timing_recovery_cc GARDNER 256 0.5 2 --add_q | \
csdr dbpsk_decoder_c_u8 | \
dd bs=1024 count=10 of=/s/bpsk31_testout
"""%snr
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
if printcmds: print cmd
os.system(cmd)
def getminsize():
return min(os.path.getsize("/s/bpsk31_testout"), os.path.getsize("/s/bpsk31_testin"))
def mkdiff(shift):
if shift==0:
return int(p("cmp -l /s/bpsk31_testin /s/bpsk31_testout | wc -l"))
elif shift<0:
return int(p("(dd if=/dev/zero bs=%d count=1; cat /s/bpsk31_testin)>/s/bpsk31_testin0; cmp -l /s/bpsk31_testin0 /s/bpsk31_testout | wc -l"%-shift))
elif shift>0:
return int(p("(dd if=/dev/zero bs=%d count=1; cat /s/bpsk31_testout)>/s/bpsk31_testout0; cmp -l /s/bpsk31_testin /s/bpsk31_testout0 | wc -l"%shift))
lf=open("/s/output_results","w")
for snr in range(0,20,2):
genfiles(snr)
num_totalbits=getminsize()
num_errors=None
for shift in range(-5,5):
curr_num_errors = mkdiff(shift)
if not num_errors or (num_errors and num_errors > curr_num_errors):
num_errors = curr_num_errors
lf.write("%d; %d; %d; %d\n" %(snr, num_errors, num_totalbits, num_errors/float(num_totalbits)))