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,
36 float phase_gain=0.25, float freq_gain=0.25*0.25/4.0);
39 * \brief Takes an OFDM symbol in, demaps it into bits of 0's and 1's, packs
40 * them into packets, and sends to to a message queue sink.
42 * NOTE: The mod input parameter simply chooses a pre-defined demapper/slicer. Eventually,
43 * we want to be able to pass in a reference to an object to do the demapping and slicing
44 * for a given modulation type.
46 class gr_ofdm_frame_sink : public gr_sync_block
48 friend gr_ofdm_frame_sink_sptr
49 gr_make_ofdm_frame_sink (const std::vector<gr_complex> &sym_position,
50 const std::vector<unsigned char> &sym_value_out,
51 gr_msg_queue_sptr target_queue, unsigned int occupied_tones,
52 float phase_gain, float freq_gain);
55 enum state_t {STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER};
57 static const int MAX_PKT_LEN = 4096;
58 static const int HEADERBYTELEN = 4;
60 gr_msg_queue_sptr d_target_queue; // where to send the packet when received
62 unsigned int d_header; // header bits
63 int d_headerbytelen_cnt; // how many so far
65 unsigned char *d_bytes_out; // hold the current bytes produced by the demapper
67 unsigned int d_occupied_carriers;
68 unsigned int d_byte_offset;
69 unsigned int d_partial_byte;
71 unsigned char d_packet[MAX_PKT_LEN]; // assembled payload
72 int d_packetlen; // length of packet
73 int d_packet_whitener_offset; // offset into whitener string to use
74 int d_packetlen_cnt; // how many so far
76 gr_complex * d_derotated_output; // Pointer to output stream to send deroated symbols out
78 std::vector<gr_complex> d_sym_position;
79 std::vector<unsigned char> d_sym_value_out;
80 std::vector<gr_complex> d_dfe;
83 unsigned char d_resid;
84 unsigned int d_nresid;
92 gr_ofdm_frame_sink(const std::vector<gr_complex> &sym_position,
93 const std::vector<unsigned char> &sym_value_out,
94 gr_msg_queue_sptr target_queue, unsigned int occupied_tones,
95 float phase_gain, float freq_gain);
98 void enter_have_sync();
99 void enter_have_header();
103 // confirm that two copies of header info are identical
104 return ((d_header >> 16) ^ (d_header & 0xffff)) == 0;
107 unsigned char slicer(const gr_complex x);
108 unsigned int demapper(const gr_complex *in,
111 bool set_sym_value_out(const std::vector<gr_complex> &sym_position,
112 const std::vector<unsigned char> &sym_value_out);
115 ~gr_ofdm_frame_sink();
117 int work(int noutput_items,
118 gr_vector_const_void_star &input_items,
119 gr_vector_void_star &output_items);
122 #endif /* INCLUDED_GR_OFDM_FRAME_SINK_H */