1 files changed, 82 insertions, 0 deletions
diff --git a/src/host/layer23/src/transceiver/gmsk.h b/src/host/layer23/src/transceiver/gmsk.h
new file mode 100644
index 00000000..b9ca4e49
--- /dev/null
+++ b/src/host/layer23/src/transceiver/gmsk.h
@@ -0,0 +1,82 @@
+/*
+ * gmsk.h
+ *
+ * GMSK modulation support
+ *
+ * Copyright (C) 2013  Sylvain Munaut <tnt@246tNt.com>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __OSMO_GMSK_H__
+#define __OSMO_GMSK_H__
+
+
+#include <complex.h>
+
+#include <osmocom/core/bits.h>
+
+struct osmo_cxvec;
+
+
+/* GMSK precomputed state for a given sps */
+struct osmo_gmsk_state
+{
+	int sps;
+	struct osmo_cxvec *pulse;
+	struct osmo_cxvec *rot_fwd;
+	struct osmo_cxvec *rot_rev;
+};
+
+
+/* State init & cleanup */
+
+struct osmo_gmsk_state *
+osmo_gmsk_init(int sps);
+
+void
+osmo_gmsk_free(struct osmo_gmsk_state *gs);
+
+
+/* Modulation */
+
+void
+osmo_gmsk_rotate_fwd(const struct osmo_gmsk_state *gs, struct osmo_cxvec *v);
+
+void
+osmo_gmsk_rotate_rev(const struct osmo_gmsk_state *gs, struct osmo_cxvec *v);
+
+struct osmo_cxvec *
+osmo_gmsk_modulate_burst(const struct osmo_gmsk_state *gs,
+                         const ubit_t *data, int data_len, int guard_len);
+
+
+/* Training sequences */
+
+struct osmo_gmsk_trainseq {
+	struct osmo_cxvec *seq;
+	float complex gain;
+	float toa;
+};
+
+struct osmo_gmsk_trainseq *
+osmo_gmsk_trainseq_generate(struct osmo_gmsk_state *gs, const ubit_t *train, int len);
+
+void
+osmo_gmsk_trainseq_free(struct osmo_gmsk_trainseq *gts);
+
+
+#endif /* __OSMO_GMSK_H__ */