diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2012-08-17 22:31:02 -0400 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2012-08-17 22:31:02 -0400 |
| commit | 5a92a70e6e4c9dd3a92055a772e01a9dee2df255 (patch) | |
| tree | 40411983e1b189dae5cc189a0a734476df4c9170 /gr-digital/lib/digital_ofdm_sampler.cc | |
| parent | 76a6f912706313fdc256b09aa17eeaf275e1fbc4 (diff) | |
digital: converted OFDM blocks to new style.
Diffstat (limited to 'gr-digital/lib/digital_ofdm_sampler.cc')
| -rw-r--r-- | gr-digital/lib/digital_ofdm_sampler.cc | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/gr-digital/lib/digital_ofdm_sampler.cc b/gr-digital/lib/digital_ofdm_sampler.cc deleted file mode 100644 index cab8c2ba93..0000000000 --- a/gr-digital/lib/digital_ofdm_sampler.cc +++ /dev/null @@ -1,133 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2007,2008,2010,2011 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. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include <digital_ofdm_sampler.h> -#include <gr_io_signature.h> -#include <gr_expj.h> -#include <cstdio> - -digital_ofdm_sampler_sptr -digital_make_ofdm_sampler (unsigned int fft_length, - unsigned int symbol_length, - unsigned int timeout) -{ - return gnuradio::get_initial_sptr(new digital_ofdm_sampler (fft_length, symbol_length, timeout)); -} - -digital_ofdm_sampler::digital_ofdm_sampler (unsigned int fft_length, - unsigned int symbol_length, - unsigned int timeout) - : gr_block ("ofdm_sampler", - gr_make_io_signature2 (2, 2, sizeof (gr_complex), sizeof(char)), - gr_make_io_signature2 (2, 2, sizeof (gr_complex)*fft_length, sizeof(char)*fft_length)), - d_state(STATE_NO_SIG), d_timeout_max(timeout), d_fft_length(fft_length), d_symbol_length(symbol_length) -{ - set_relative_rate(1.0/(double) fft_length); // buffer allocator hint -} - -void -digital_ofdm_sampler::forecast (int noutput_items, gr_vector_int &ninput_items_required) -{ - // FIXME do we need more - //int nreqd = (noutput_items-1) * d_symbol_length + d_fft_length; - int nreqd = d_symbol_length + d_fft_length; - unsigned ninputs = ninput_items_required.size (); - for (unsigned i = 0; i < ninputs; i++) - ninput_items_required[i] = nreqd; -} - - -int -digital_ofdm_sampler::general_work (int noutput_items, - gr_vector_int &ninput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items) -{ - const gr_complex *iptr = (const gr_complex *) input_items[0]; - const char *trigger = (const char *) input_items[1]; - - gr_complex *optr = (gr_complex *) output_items[0]; - char *outsig = (char *) output_items[1]; - - //FIXME: we only process a single OFDM symbol at a time; after the preamble, we can - // process a few at a time as long as we always look out for the next preamble. - - unsigned int index=d_fft_length; // start one fft length into the input so we can always look back this far - - outsig[0] = 0; // set output to no signal by default - - // Search for a preamble trigger signal during the next symbol length - while((d_state != STATE_PREAMBLE) && (index <= (d_symbol_length+d_fft_length))) { - if(trigger[index]) { - outsig[0] = 1; // tell the next block there is a preamble coming - d_state = STATE_PREAMBLE; - } - else - index++; - } - - unsigned int i, pos, ret; - switch(d_state) { - case(STATE_PREAMBLE): - // When we found a preamble trigger, get it and set the symbol boundary here - for(i = (index - d_fft_length + 1); i <= index; i++) { - *optr++ = iptr[i]; - } - - d_timeout = d_timeout_max; // tell the system to expect at least this many symbols for a frame - d_state = STATE_FRAME; - consume_each(index - d_fft_length + 1); // consume up to one fft_length away to keep the history - ret = 1; - break; - - case(STATE_FRAME): - // use this state when we have processed a preamble and are getting the rest of the frames - //FIXME: we could also have a power squelch system here to enter STATE_NO_SIG if no power is received - - // skip over fft length history and cyclic prefix - pos = d_symbol_length; // keeps track of where we are in the input buffer - while(pos < d_symbol_length + d_fft_length) { - *optr++ = iptr[pos++]; - } - - if(d_timeout-- == 0) { - printf("TIMEOUT\n"); - d_state = STATE_NO_SIG; - } - - consume_each(d_symbol_length); // jump up by 1 fft length and the cyclic prefix length - ret = 1; - break; - - case(STATE_NO_SIG): - default: - consume_each(index-d_fft_length); // consume everything we've gone through so far leaving the fft length history - ret = 0; - break; - } - - return ret; -} |