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Diffstat (limited to 'gr-analog/include/analog/cpm.h')
-rw-r--r-- | gr-analog/include/analog/cpm.h | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/gr-analog/include/analog/cpm.h b/gr-analog/include/analog/cpm.h deleted file mode 100644 index d22e02321..000000000 --- a/gr-analog/include/analog/cpm.h +++ /dev/null @@ -1,86 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2010,2012 Free Software Foundation, Inc. - * - * 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_ANALOG_CPM_H -#define INCLUDED_ANALOG_CPM_H - -#include <analog/api.h> -#include <vector> - -namespace gr { - namespace analog { - - class ANALOG_API cpm - { - public: - enum cpm_type { - LRC, - LSRC, - LREC, - TFM, - GAUSSIAN, - GENERIC = 999 - }; - - /*! \brief Return the taps for an interpolating FIR filter (gr_interp_fir_filter_fff). - * - * These taps represent the phase response \f$g(k)\f$ for use in a CPM modulator, - * see also gr_cpmmod_bc. - * - * \param type The CPM type (Rectangular, Raised Cosine, Spectral Raised Cosine, - * Tamed FM or Gaussian). - * \param samples_per_sym Samples per symbol. - * \param L The length of the phase response in symbols. - * \param beta For Spectral Raised Cosine, this is the rolloff factor. For Gaussian - * phase responses, this the 3dB-time-bandwidth product. For all other - * cases, it is ignored. - * - * Output: returns a vector of length \a K = \p samples_per_sym x \p L. - * This can be used directly in an interpolating FIR filter such as - * gr_interp_fir_filter_fff with interpolation factor \p samples_per_sym. - * - * All phase responses are normalised s.t. \f$ \sum_{k=0}^{K-1} g(k) = 1\f$; this will cause - * a maximum phase change of \f$ h \cdot \pi\f$ between two symbols, where \a h is the - * modulation index. - * - * The following phase responses can be generated: - * - LREC: Rectangular phase response. - * - LRC: Raised cosine phase response, looks like 1 - cos(x). - * - LSRC: Spectral raised cosine. This requires a rolloff factor beta. - * The phase response is the Fourier transform of raised cosine - * function. - * - TFM: Tamed frequency modulation. This scheme minimizes phase change for - * rapidly varying input symbols. - * - GAUSSIAN: A Gaussian phase response. For a modulation index h = 1/2, this - * results in GMSK. - * - * A short description of all these phase responses can be found in [1]. - * - * [1]: Anderson, Aulin and Sundberg; Digital Phase Modulation - */ - static std::vector<float> - phase_response(cpm_type type, unsigned samples_per_sym, unsigned L, double beta=0.3); - }; - } // namespace analog -} // namespace gr - -#endif /* INCLUDED_ANALOG_CPM_H */ - |