GNU Radio v3.6.2-149-ga6d285d9 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2009,2012 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 00023 #ifndef INCLUDED_FILTER_CHANNEL_MODEL_H 00024 #define INCLUDED_FILTER_CHANNEL_MODEL_H 00025 00026 #include <filter/api.h> 00027 #include <gr_hier_block2.h> 00028 #include <gr_types.h> 00029 00030 namespace gr { 00031 namespace filter { 00032 00033 /*! 00034 * \brief channel simulator 00035 * \ingroup misc_blk 00036 * 00037 * This block implements a basic channel model simulator that can 00038 * be used to help evaluate, design, and test various signals, 00039 * waveforms, and algorithms. This model allows the user to set 00040 * the voltage of an AWGN noise source, a (normalized) frequency 00041 * offset, a sample timing offset, and a noise seed to randomize 00042 * the AWGN noise source. 00043 * 00044 * Multipath can be approximated in this model by using a FIR 00045 * filter representation of a multipath delay profile.. 00046 */ 00047 class FILTER_API channel_model : virtual public gr_hier_block2 00048 { 00049 public: 00050 // gr::filter::channel_model::sptr 00051 typedef boost::shared_ptr<channel_model> sptr; 00052 00053 /*! \brief Build the channel simulator. 00054 * 00055 * \param noise_voltage The AWGN noise level as a voltage (to be 00056 * calculated externally to meet, say, a 00057 * desired SNR). 00058 * \param frequency_offset The normalized frequency offset. 0 is 00059 * no offset; 0.25 would be, for a digital 00060 * modem, one quarter of the symbol rate. 00061 * \param epsilon The sample timing offset to emulate the 00062 * different rates between the sample clocks of 00063 * the transmitter and receiver. 1.0 is no difference. 00064 * \param taps Taps of a FIR filter to emulate a multipath delay profile. 00065 * \param noise_seed A random number generator seed for the noise source. 00066 */ 00067 static sptr make(double noise_voltage=0.0, 00068 double frequency_offset=0.0, 00069 double epsilon=1.0, 00070 const std::vector<gr_complex> &taps=std::vector<gr_complex>(1,1), 00071 double noise_seed=0); 00072 00073 virtual void set_noise_voltage(double noise_voltage) = 0; 00074 virtual void set_frequency_offset(double frequency_offset) = 0; 00075 virtual void set_taps(const std::vector<gr_complex> &taps) = 0; 00076 virtual void set_timing_offset(double epsilon) = 0; 00077 00078 virtual double noise_voltage() const = 0; 00079 virtual double frequency_offset() const = 0; 00080 virtual std::vector<gr_complex> taps() const = 0; 00081 virtual double timing_offset() const = 0; 00082 }; 00083 00084 } /* namespace filter */ 00085 } /* namespace gr */ 00086 00087 #endif /* INCLUDED_FILTER_CHANNEL_MODEL_H */