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/* -*- c++ -*- */
/*
* Copyright 2007,2011 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.
*/
#ifndef INCLUDED_DIGITAL_OFDM_FRAME_SINK_H
#define INCLUDED_DIGITAL_OFDM_FRAME_SINK_H
#include <digital_api.h>
#include <gr_sync_block.h>
#include <gr_msg_queue.h>
class digital_ofdm_frame_sink;
typedef boost::shared_ptr<digital_ofdm_frame_sink> digital_ofdm_frame_sink_sptr;
DIGITAL_API digital_ofdm_frame_sink_sptr
digital_make_ofdm_frame_sink (const std::vector<gr_complex> &sym_position,
const std::vector<unsigned char> &sym_value_out,
gr_msg_queue_sptr target_queue, unsigned int occupied_tones,
float phase_gain=0.25, float freq_gain=0.25*0.25/4.0);
/*!
* \brief Takes an OFDM symbol in, demaps it into bits of 0's and 1's, packs
* them into packets, and sends to to a message queue sink.
* \ingroup sink_blk
* \ingroup ofdm_blk
*
* NOTE: The mod input parameter simply chooses a pre-defined demapper/slicer. Eventually,
* we want to be able to pass in a reference to an object to do the demapping and slicing
* for a given modulation type.
*/
class DIGITAL_API digital_ofdm_frame_sink : public gr_sync_block
{
friend DIGITAL_API digital_ofdm_frame_sink_sptr
digital_make_ofdm_frame_sink (const std::vector<gr_complex> &sym_position,
const std::vector<unsigned char> &sym_value_out,
gr_msg_queue_sptr target_queue, unsigned int occupied_tones,
float phase_gain, float freq_gain);
private:
enum state_t {STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER};
static const int MAX_PKT_LEN = 4096;
static const int HEADERBYTELEN = 4;
gr_msg_queue_sptr d_target_queue; // where to send the packet when received
state_t d_state;
unsigned int d_header; // header bits
int d_headerbytelen_cnt; // how many so far
unsigned char *d_bytes_out; // hold the current bytes produced by the demapper
unsigned int d_occupied_carriers;
unsigned int d_byte_offset;
unsigned int d_partial_byte;
unsigned char d_packet[MAX_PKT_LEN]; // assembled payload
int d_packetlen; // length of packet
int d_packet_whitener_offset; // offset into whitener string to use
int d_packetlen_cnt; // how many so far
gr_complex * d_derotated_output; // Pointer to output stream to send deroated symbols out
std::vector<gr_complex> d_sym_position;
std::vector<unsigned char> d_sym_value_out;
std::vector<gr_complex> d_dfe;
unsigned int d_nbits;
unsigned char d_resid;
unsigned int d_nresid;
float d_phase;
float d_freq;
float d_phase_gain;
float d_freq_gain;
float d_eq_gain;
std::vector<int> d_subcarrier_map;
protected:
digital_ofdm_frame_sink(const std::vector<gr_complex> &sym_position,
const std::vector<unsigned char> &sym_value_out,
gr_msg_queue_sptr target_queue, unsigned int occupied_tones,
float phase_gain, float freq_gain);
void enter_search();
void enter_have_sync();
void enter_have_header();
bool header_ok()
{
// confirm that two copies of header info are identical
return ((d_header >> 16) ^ (d_header & 0xffff)) == 0;
}
unsigned char slicer(const gr_complex x);
unsigned int demapper(const gr_complex *in,
unsigned char *out);
bool set_sym_value_out(const std::vector<gr_complex> &sym_position,
const std::vector<unsigned char> &sym_value_out);
public:
~digital_ofdm_frame_sink();
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
#endif /* INCLUDED_GR_OFDM_FRAME_SINK_H */
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