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diff --git a/gcell/include/gcell/gcp_fft_1d_r2.h b/gcell/include/gcell/gcp_fft_1d_r2.h
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+++ b/gcell/include/gcell/gcp_fft_1d_r2.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef INCLUDED_GCP_FFT_1D_R2_H
+#define INCLUDED_GCP_FFT_1D_R2_H
+
+#include <gcell/gc_job_manager.h>
+#include <complex>
+
+/*!
+ * \brief Submit a job that computes the forward or inverse FFT.
+ *
+ * \param mgr is the job manager instance
+ * \param log2_fft_length is the log2 of the fft_length (4 <= x <= 12).
+ * \param forward is true to compute the forward transform, else the inverse.
+ * \param shift indicates if an "fftshift" should be applied to the output data
+ * \param out is the fft_length output from FFT (must be 16-byte aligned).
+ * \param in is the fft_length input to FFT (must be 16-byte aligned).
+ * \param twiddle is fft_length/4 twiddle factor input to FFT (must be 16-byte aligned).
+ * \param window is the window to be applied to the input data.
+ *    The window length must be either 0 or fft_length (must be 16-byte aligned).
+ *
+ * Returns a shared_ptr to a job descriptor which should be passed to wait_job*.
+ * Throws an exception in the event of a problem.
+ * This uses the FFTW conventions for scaling.  That is, neither the forward nor inverse
+ * are scaled by 1/fft_length.
+ */
+gc_job_desc_sptr
+gcp_fft_1d_r2_submit(gc_job_manager_sptr mgr,
+		     unsigned int log2_fft_length,
+		     bool forward,
+		     bool shift,
+		     std::complex<float> *out,
+		     const std::complex<float> *in,
+		     const std::complex<float> *twiddle,
+		     const float *window);
+
+/*!
+ * \brief Compute twiddle factors 
+ *
+ * \param log2_fft_length is the log2 of the fft_length.
+ * \param W is fft_length/4 twiddle factor output (must be 16-byte aligned).
+ */
+void
+gcp_fft_1d_r2_twiddle(unsigned int log2_fft_length, std::complex<float> *W);
+
+#endif /* INCLUDED_GCP_FFT_1D_R2_H */