Brett Trotter wrote:
Tom Rondeau wrote:
Just the status report from the work done the past couple of weeks on
OFDM. With Matt Ettus, Bob McGwier, and Eric Blossom, we successfully
transmitted and received OFDM over the air with BPSK, QPSK, and 16QAM. I
have merged the code into the trunk so others can use it, though I
currently restricted the subcarrier modulations to use only BPSK or QPSK
(M-QAM will be coming soon I hope). It's not complete; specificially, it
lacks an adaptive equalizer over the entire packet and channel coding.
Other features should be coming over time, too.
If you're interested, and for the good of the community, I have posted
the presentation I gave last week to the [EMAIL PROTECTED] Symposium about the
implementation details of the system. This includes the block-diagram
representations of the flow graphs for the transmitter, receiver, and,
most importantly, the synchronizers used in the system. I have made it
available in both PPT and PDF format (the PPT opens just fine in the
latest version of Open Office for those without MS Office). You can find
it under the Presentations link on the front page of Trac (Johnathan,
Eric, if you have a better place to put this kind of information, let me
know; this seemed like a good place to start).
Tom
I seem to be having trouble- I've tried the usual suspects for arguments but
get
[EMAIL PROTECTED] ofdm]# ./benchmark_ofdm_tx.py -f 13M -s 300 -i 200 -M 1
Traceback (most recent call last):
File "./benchmark_ofdm_tx.py", line 217, in ?
main()
File "./benchmark_ofdm_tx.py", line 190, in main
fg = usrp_graph(options)
File "./benchmark_ofdm_tx.py", line 56, in __init__
self.txpath = transmit_path(self, options)
File
"/root/gnuradio-normal/gnuradio-examples/python/ofdm/transmit_path.py", line
44, in __init__
self.ofdm_tx = \
File "/usr/local/lib/python2.4/site-packages/gnuradio/blksimpl/ofdm.py",
line 88, in __init__
self._pkt_input = gr.ofdm_bpsk_mapper(msgq_limit,
options.occupied_tones, options.fft_length)
File
"/usr/local/lib/python2.4/site-packages/gnuradio/gr/gnuradio_swig_py_general.py",
line 7060, in ofdm_bpsk_mapper
return _gnuradio_swig_py_general.ofdm_bpsk_mapper(*args)
TypeError: ofdm_bpsk_mapper expected 5 arguments, got 3
What options does it really need?
even if i go nuts and specify nearly everything with defaults
./benchmark_ofdm_tx.py -f 13M -s 300 -i 200 -M 1 --tx-amplitude=12000 -m
bpsk --fft-length=512 --occupied-tones=200 --cp-length=128
I still get the same 'got 3'
What'd I miss?
It's a SWIG problem. You'll probably need to clean out your
gnuradio-core/src/lib/swig directory (make distclean inside it works and
prevents you from having to build the whole thing again).
We switched the interface by handling the insertion of known symbols in
another block, so we went from 5 inputs to 3. Try again after cleaning
up the SWIG files and reinstalling.
Tom
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
