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[Discuss-gnuradio] About packetized MIMO Tx/Rx,
From: |
Sungro Yoon |
Subject: |
[Discuss-gnuradio] About packetized MIMO Tx/Rx, |
Date: |
Thu, 7 Jan 2010 20:58:50 -0500 |
Hello,
I am currently trying to implement 2x2 MIMO packet transmission and
having difficulties.. I need help and any comment will be really
useful..
My main references are benchmark_tx.py and fm_tx_2_daughterboards.py.
As I cannot directly connect signal sources to gr.interleave() unlike
in fm_tx_2_daughterboards.py (sending data is put into queue of
message_source only when send_pkt(payload) is called), what I have
done is as follows.
* I created multi_mod_pkts class that is similar to mod_pkts. Here I
created two separate message_source (_pkt_input1 and _pkt_input2).
* I connected those two message_sources into interleaver and then
self, using following code
self._pkt_input1 = gr.message_source(gr.sizeof_char, msgq_limit)
self._pkt_input2 = gr.message_source(gr.sizeof_char, msgq_limit)
intl = gr.interleave(gr.sizeof_char)
self.connect(self._pkt_input1, (intl, 0))
self.connect(self._pkt_input2, (intl, 1))
self.connect(intl, self._modulator, self)
* Whenever send_pkt(payload1, payload2) is called, those messages are
put into msg queue of message_source. respectively.
* In the main program, I created usrp_sink_c object and set mux using
following code
self._u = usrp.sink_c (which=self._which,
nchan=2,
fusb_block_size=self._fusb_block_size,
fusb_nblocks=self._fusb_nblocks)
self._subdev = (self._u.db(0, 0), self._u.db(1, 0))
self._u.set_mux(0xba98)
self._subdev[0].set_gain(self._subdev[0].gain_range()[1]) #
set max Tx gain
self._subdev[1].set_gain(self._subdev[1].gain_range()[1]) #
set max Tx gain
self.set_freq(0, freq0)
self.set_freq(1, freq1)
self._subdev[0].set_enable(True) # enable
transmitter
self._subdev[1].set_enable(True) # enable
transmitter
self._dxc = self._which
self.connect(self, self._u)
That's all. But the receiver does not sense any incoming traffic. What
could be done to make it work?
Thank you in advance!
Sungro
- [Discuss-gnuradio] About packetized MIMO Tx/Rx,,
Sungro Yoon <=