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Diffstat (limited to 'gnuradio-core/src/lib/hier/gr_cpm.h')
| -rw-r--r-- | gnuradio-core/src/lib/hier/gr_cpm.h | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/gnuradio-core/src/lib/hier/gr_cpm.h b/gnuradio-core/src/lib/hier/gr_cpm.h deleted file mode 100644 index f32fa44fd6..0000000000 --- a/gnuradio-core/src/lib/hier/gr_cpm.h +++ /dev/null @@ -1,75 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2010 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_GR_CPM_H -#define INCLUDED_GR_CPM_H - -#define M_TWOPI (2*M_PI) - -class gr_cpm -{ - public: - enum cpm_type { - LRC, - LSRC, - LREC, - TFM, - GAUSSIAN, - GENERIC = 999 - }; - - //! Return the taps for an interpolating FIR filter (gr_fir_filter_fff). - // - // These taps represent the phase response for use in a CPM modulator. - // - // Parameters: - // \p type: The CPM type (Rectangular, Raised Cosine, Spectral Raised Cosine, - // Tamed FM or Gaussian). - // \p samples_per_sym: Samples per symbol. - // \p L: The length of the phase response in symbols. - // \p 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 \p L * \p samples_per_sym. 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 taps are normalised s.t. \sum taps = 1; this causes a maximum phase change - // of h*pi between two symbols, where 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. - // - static std::vector<float> - phase_response(cpm_type type, unsigned samples_per_sym, unsigned L, double beta=0.3); -}; - -#endif /* INCLUDED_GR_CPM_H */ - |