3 # Copyright 2007 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
24 from gnuradio import gr
26 class ofdm_sync_fixed(gr.hier_block2):
27 def __init__(self, fft_length, cp_length, nsymbols, freq_offset, logging=False):
29 gr.hier_block2.__init__(self, "ofdm_sync_fixed",
30 gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
31 gr.io_signature2(2, 2, gr.sizeof_float, gr.sizeof_char)) # Output signature
33 # Use a fixed trigger point instead of sync block
34 symbol_length = fft_length + cp_length
35 pkt_length = nsymbols*symbol_length
36 data = (pkt_length)*[0,]
37 data[(symbol_length)-1] = 1
38 self.peak_trigger = gr.vector_source_b(data, True)
40 # Use a pre-defined frequency offset
41 foffset = (pkt_length)*[math.pi*freq_offset,]
42 self.frequency_offset = gr.vector_source_f(foffset, True)
44 self.connect(self, gr.null_sink(gr.sizeof_gr_complex))
45 self.connect(self.frequency_offset, (self,0))
46 self.connect(self.peak_trigger, (self,1))
49 self.connect(self.peak_trigger, gr.file_sink(gr.sizeof_char, "ofdm_sync_fixed-peaks_b.dat"))