argilo
/
gr-osmosdr
forked from sdr/gr-osmosdr
1
0
Fork 0
Code Pull Requests Releases Wiki Activity

apps: Improve the GSM burst generation 

Not sure the power window is really aligned to the samples yet though.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2013-06-09 20:14:49 +02:00 committed by Dimitri Stolnikov
parent cdeb105495
commit 970658c071
1 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
apps/osmocom_siggen_base.py
View File

@ -67,22 +67,28 @@ class gsm_source_c(gr.hier_block2):
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._bits = blocks.vector_source_b(self.gen_gsm_seq(), True)
self._symb_rate = 270833
self._symb_rate = 13e6 / 48;
self._samples_per_symbol = 2
bits_per_symbol = 1
self._pack = blocks.unpacked_to_packed_bb(bits_per_symbol, gr.GR_MSB_FIRST)
self._data = blocks.vector_source_b(self.gen_gsm_seq(), True, 2)
self._split = blocks.vector_to_streams(gr.sizeof_char*1, 2)
self._mod = digital.gmsk_mod( self._samples_per_symbol, bt=0.35 )
self._pack = blocks.unpacked_to_packed_bb(1, gr.GR_MSB_FIRST)
self._mod = digital.gmsk_mod(self._samples_per_symbol, bt=0.35)
self._pwr_f = blocks.char_to_float(1, 1)
self._pwr_c = blocks.float_to_complex(1)
self._pwr_w = blocks.repeat(gr.sizeof_gr_complex*1, self._samples_per_symbol)
self._mul = blocks.multiply_vcc(1)
self._interpolate = filter.fractional_resampler_cc( 0,
(self._symb_rate * self._samples_per_symbol) / sample_rate )
self._scale = blocks.multiply_const_cc(amplitude)
self.connect(self._bits, self._pack, self._mod, self._interpolate, self._scale, self)
self.connect(self._data, self._split)
self.connect((self._split, 0), self._pack, self._mod, (self._mul, 0))
self.connect((self._split, 1), self._pwr_f, self._pwr_c, self._pwr_w, (self._mul, 1))
self.connect(self._mul, self._interpolate, self._scale, self)
def set_amplitude(self, amplitude):
self._scale.set_k(amplitude)
@ -97,9 +103,11 @@ class gsm_source_c(gr.hier_block2):
[0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,1,1,1],
list(numpy.random.randint(0, 2, 58)),
[0,0,0],
[1] * (l-148)
]
return map(int, sum(chunks,[]))
burst = sum(chunks,[])
burst = sum(map(list, zip(burst, (1,) * len(burst))), [])
burst += [1,0] * (l-148)
return map(int, burst)
def gen_gsm_frame(self):
return \