[Discuss-gnuradio] Modifying OFDM-TX block get an additional output

[Damindra Bandara]

Hi,

I am trying to modify OFDM-TX block to get an additional output after the payload_mod block(Payload Constellation modulator). I modified the ofdm_txrx.py file in /gr-digital/python/digital as follows.

gr.hier_block2.__init__(self, "ofdm_tx",
                    gr.io_signature(1, 1, gr.sizeof_char),
                    gr.io_signature(1, 2, gr.sizeof_gr_complex,gr.sizeof_gr_complex))

self.connect((payload_mod), (self, 1))

I also added the following to digital_ofdm_tx.xml as,

  <source>
    <name>New out</name>
    <type>complex</type>
    <optional>1</optional>
  </source>

After make install I can see the additional output port. But when I try to run it I get the following error.

gr.io_signature(1, 2, gr.sizeof_gr_complex,gr.sizeof_gr_complex))
TypeError: make() takes exactly 3 arguments (4 given)

Could you please let me know whether there are any additional changes that I have to do to make this work.

Thank you,

Damindra

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Damindra Savithri Bandara,

Ph.D. in Information Technology (Candidate)
George Mason University,
Fairfax,
Virginia