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-/* -*- 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 */
-