3 * Copyright 2007 Free Software Foundation, Inc.
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23 #ifndef INCLUDED_GR_OFDM_FRAME_SINK_H
24 #define INCLUDED_GR_OFDM_FRAME_SINK_H
26 #include <gr_sync_block.h>
27 #include <gr_msg_queue.h>
29 class gr_ofdm_frame_sink;
30 typedef boost::shared_ptr<gr_ofdm_frame_sink> gr_ofdm_frame_sink_sptr;
32 gr_ofdm_frame_sink_sptr
33 gr_make_ofdm_frame_sink (const std::vector<gr_complex> &sym_position,
34 const std::vector<unsigned char> &sym_value_out,
35 gr_msg_queue_sptr target_queue, unsigned int occupied_tones);
38 * \brief Takes an OFDM symbol in, demaps it into bits of 0's and 1's, packs
39 * them into packets, and sends to to a message queue sink.
41 * NOTE: The mod input parameter simply chooses a pre-defined demapper/slicer. Eventually,
42 * we want to be able to pass in a reference to an object to do the demapping and slicing
43 * for a given modulation type.
45 class gr_ofdm_frame_sink : public gr_sync_block
47 friend gr_ofdm_frame_sink_sptr
48 gr_make_ofdm_frame_sink (const std::vector<gr_complex> &sym_position,
49 const std::vector<unsigned char> &sym_value_out,
50 gr_msg_queue_sptr target_queue, unsigned int occupied_tones);
53 enum state_t {STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER};
55 static const int MAX_PKT_LEN = 4096;
56 static const int HEADERBYTELEN = 4;
58 gr_msg_queue_sptr d_target_queue; // where to send the packet when received
60 unsigned int d_header; // header bits
61 int d_headerbytelen_cnt; // how many so far
63 unsigned char *d_bytes_out; // hold the current bytes produced by the demapper
65 unsigned int d_occupied_carriers;
66 unsigned int d_byte_offset;
67 unsigned int d_partial_byte;
69 unsigned char d_packet[MAX_PKT_LEN]; // assembled payload
70 int d_packetlen; // length of packet
71 int d_packet_whitener_offset; // offset into whitener string to use
72 int d_packetlen_cnt; // how many so far
74 std::vector<gr_complex> d_sym_position;
75 std::vector<unsigned char> d_sym_value_out;
78 unsigned char d_resid;
79 unsigned int d_nresid;
82 gr_ofdm_frame_sink(const std::vector<gr_complex> &sym_position,
83 const std::vector<unsigned char> &sym_value_out,
84 gr_msg_queue_sptr target_queue, unsigned int occupied_tones);
87 void enter_have_sync();
88 void enter_have_header();
92 // confirm that two copies of header info are identical
93 return ((d_header >> 16) ^ (d_header & 0xffff)) == 0;
96 unsigned char slicer(const gr_complex x);
97 unsigned int demapper(const gr_complex *in,
100 bool set_sym_value_out(const std::vector<gr_complex> &sym_position,
101 const std::vector<unsigned char> &sym_value_out);
104 ~gr_ofdm_frame_sink();
106 int work(int noutput_items,
107 gr_vector_const_void_star &input_items,
108 gr_vector_void_star &output_items);
111 #endif /* INCLUDED_GR_OFDM_FRAME_SINK_H */