Added Extract CSI block.

This block takes PDU messages as input, looks for a "csi" entry in the meta dictionary, and if found outputs a complex CSI vector on a stream output. The meta is also sent along as stream tags.
2021-07-14 19:34:12 +02:00
parent 51f7d6b284
commit 7e3107282a
8 changed files with 203 additions and 0 deletions
@@ -0,0 +1,85 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2021 Anton Ottosson.
+ *
+ * This 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.
+ *
+ * This software 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 software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "extract_csi_impl.h"
+
+namespace gr {
+  namespace ieee802_11 {
+
+    extract_csi::sptr
+    extract_csi::make()
+    {
+      return gnuradio::get_initial_sptr
+        (new extract_csi_impl());
+    }
+
+
+    extract_csi_impl::extract_csi_impl()
+      : gr::sync_block("extract_csi",
+              gr::io_signature::make(0, 0, 0),
+              gr::io_signature::make(1, 1, 52 * sizeof(gr_complex)))
+    {
+      message_port_register_in(pmt::mp("pdu in"));
+    }
+
+    extract_csi_impl::~extract_csi_impl()
+    {
+    }
+
+    int
+    extract_csi_impl::work(int noutput_items,
+        gr_vector_const_void_star &input_items,
+        gr_vector_void_star &output_items)
+    {
+      pmt::pmt_t pdu(delete_head_nowait(pmt::mp("pdu in")));
+
+      if (pdu.get() == NULL) return 0;
+
+      if (!pmt::is_pair(pdu) || !pmt::is_dict(pmt::car(pdu)))
+        throw std::runtime_error("received a malformed pdu message");
+
+      d_meta = pmt::car(pdu);
+
+      if (!pmt::dict_has_key(d_meta, pmt::mp("csi"))) return 0;
+
+      d_csi = pmt::c32vector_elements(pmt::dict_ref(d_meta, pmt::mp("csi"), pmt::PMT_NIL));
+
+      gr_complex* out = (gr_complex*) output_items[0];
+
+      std::copy(d_csi.begin(), d_csi.end(), out);
+
+      pmt::pmt_t keys(pmt::dict_keys(d_meta));
+      for (int i = 0; i < pmt::length(keys); i++) {
+        pmt::pmt_t k(pmt::nth(i, keys));
+        pmt::pmt_t v(pmt::dict_ref(d_meta, k, pmt::PMT_NIL));
+        add_item_tag(0, nitems_written(0), k, v, alias_pmt());
+      }
+
+      return 1;
+    }
+
+  } /* namespace ieee802_11 */
+} /* namespace gr */
+