Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+// np_fwht.h
+// Basic implementation of the Fast Walsh-Hadamard Transforms
+// 
+// (c) 2016 - Nico Palermo, IV3NWV - Microtelecom Srl, Italy
+// ------------------------------------------------------------------------------
+// This file is part of the qracodes project, a Forward Error Control
+// encoding/decoding package based on Q-ary RA (repeat and accumulate) LDPC codes.
+//
+//    qracodes 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 of the License, or
+//    (at your option) any later version.
+//    qracodes 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 qracodes source distribution.  
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef _npfwht_h_
+#define _npfwht_h_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void np_fwht(int nlogdim, float *dst, float *src);
+// Compute the Walsh-Hadamard transform of the given data up to a 
+// 64-dimensional transform
+//
+// Input parameters:
+//		nlogdim:  log2 of the transform size. Must be in the range [0..6]
+//      src    :  pointer to the input  data buffer. 
+//      dst    :  pointer to the output data buffer. 
+//
+// src and dst must point to preallocated data buffers of size 2^nlogdim*sizeof(float) 
+// src and dst buffers can overlap
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _npfwht_