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diff --git a/fpga/usrp3/lib/rfnoc/join_complex.v b/fpga/usrp3/lib/rfnoc/join_complex.v
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+
+// Copyright 2014, Ettus Research
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+// Module to join a complex stream to I and Q outputs.  NOTE -- ONLY works when you can guarantee upstream paths match!
+
+module join_complex
+  #(parameter WIDTH=16)
+   (input [WIDTH-1:0] ii_tdata, input ii_tlast, input ii_tvalid, output ii_tready,
+    input [WIDTH-1:0] iq_tdata, input iq_tlast, input iq_tvalid, output iq_tready,
+    output [WIDTH*2-1:0] o_tdata, output o_tlast, output o_tvalid, input o_tready,
+    output error);
+
+   assign o_tdata = {ii_tdata,iq_tdata};
+
+   assign o_tlast = ii_tlast;
+
+   assign o_tvalid = ii_tvalid;
+
+   assign ii_tready = o_tready;
+   assign iq_tready = o_tready;
+
+   assign  error = (ii_tlast ^ iq_tlast) | (ii_tvalid ^ iq_tvalid);
+      
+endmodule // join_complex