diff options
Diffstat (limited to 'gr-digital/python/digital/ofdm_receiver.py')
| -rw-r--r-- | gr-digital/python/digital/ofdm_receiver.py | 58 |
1 files changed, 29 insertions, 29 deletions
diff --git a/gr-digital/python/digital/ofdm_receiver.py b/gr-digital/python/digital/ofdm_receiver.py index 4b7836b43c..d23b338b78 100644 --- a/gr-digital/python/digital/ofdm_receiver.py +++ b/gr-digital/python/digital/ofdm_receiver.py @@ -1,24 +1,28 @@ #!/usr/bin/env python # # Copyright 2006-2008 Free Software Foundation, Inc. -# +# # This file is part of GNU Radio -# +# # GNU Radio is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3, or (at your option) # any later version. -# +# # GNU Radio 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 General Public License for more details. -# +# # You should have received a copy of the GNU General Public License # along with GNU Radio; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 51 Franklin Street, # Boston, MA 02110-1301, USA. -# +# + +from __future__ import absolute_import +from __future__ import division +from __future__ import unicode_literals import math from numpy import fft @@ -28,16 +32,12 @@ from gnuradio import analog from gnuradio import blocks from gnuradio import filter -import digital_swig as digital -from ofdm_sync_pn import ofdm_sync_pn -from ofdm_sync_fixed import ofdm_sync_fixed -from ofdm_sync_pnac import ofdm_sync_pnac -from ofdm_sync_ml import ofdm_sync_ml +from . import digital_swig as digital +from .ofdm_sync_pn import ofdm_sync_pn +from .ofdm_sync_fixed import ofdm_sync_fixed +from .ofdm_sync_pnac import ofdm_sync_pnac +from .ofdm_sync_ml import ofdm_sync_ml -try: - from gnuradio import filter -except ImportError: - import filter_swig as filter class ofdm_receiver(gr.hier_block2): """ @@ -51,9 +51,9 @@ class ofdm_receiver(gr.hier_block2): def __init__(self, fft_length, cp_length, occupied_tones, snr, ks, logging=False): """ - Hierarchical block for receiving OFDM symbols. + Hierarchical block for receiving OFDM symbols. - The input is the complex modulated signal at baseband. + The input is the complex modulated signal at baseband. Synchronized packets are sent back to the demodulator. Args: @@ -63,13 +63,13 @@ class ofdm_receiver(gr.hier_block2): snr: estimated signal to noise ratio used to guide cyclic prefix synchronizer (float) ks: known symbols used as preambles to each packet (list of lists) logging: turn file logging on or off (bool) - """ + """ - gr.hier_block2.__init__(self, "ofdm_receiver", - gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature + gr.hier_block2.__init__(self, "ofdm_receiver", + gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature gr.io_signature2(2, 2, gr.sizeof_gr_complex*occupied_tones, gr.sizeof_char)) # Output signature - - bw = (float(occupied_tones) / float(fft_length)) / 2.0 + + bw = (old_div(float(occupied_tones) / float(fft_length)), 2.0) tb = bw*0.08 chan_coeffs = filter.firdes.low_pass (1.0, # gain 1.0, # sampling rate @@ -77,13 +77,13 @@ class ofdm_receiver(gr.hier_block2): tb, # width of trans. band filter.firdes.WIN_HAMMING) # filter type self.chan_filt = filter.fft_filter_ccc(1, chan_coeffs) - + win = [1 for i in range(fft_length)] - zeros_on_left = int(math.ceil((fft_length - occupied_tones)/2.0)) + zeros_on_left = int(math.ceil((fft_length - occupied_tones) / 2.0)) ks0 = fft_length*[0,] ks0[zeros_on_left : zeros_on_left + occupied_tones] = ks[0] - + ks0 = fft.ifftshift(ks0) ks0time = fft.ifft(ks0) # ADD SCALING FACTOR @@ -91,19 +91,19 @@ class ofdm_receiver(gr.hier_block2): SYNC = "pn" if SYNC == "ml": - nco_sensitivity = -1.0/fft_length # correct for fine frequency + nco_sensitivity = -1.0 / fft_length # correct for fine frequency self.ofdm_sync = ofdm_sync_ml(fft_length, cp_length, snr, ks0time, logging) elif SYNC == "pn": - nco_sensitivity = -2.0/fft_length # correct for fine frequency + nco_sensitivity = -2.0 / fft_length # correct for fine frequency self.ofdm_sync = ofdm_sync_pn(fft_length, cp_length, logging) elif SYNC == "pnac": - nco_sensitivity = -2.0/fft_length # correct for fine frequency + nco_sensitivity = -2.0 / fft_length # correct for fine frequency self.ofdm_sync = ofdm_sync_pnac(fft_length, cp_length, ks0time, @@ -111,10 +111,10 @@ class ofdm_receiver(gr.hier_block2): # for testing only; do not user over the air # remove filter and filter delay for this elif SYNC == "fixed": - self.chan_filt = blocks.multiply_const_cc(1.0) + self.chan_filt = blocks.multiply_const_cc(1.0) nsymbols = 18 # enter the number of symbols per packet freq_offset = 0.0 # if you use a frequency offset, enter it here - nco_sensitivity = -2.0/fft_length # correct for fine frequency + nco_sensitivity = -2.0 / fft_length # correct for fine frequency self.ofdm_sync = ofdm_sync_fixed(fft_length, cp_length, nsymbols, |