[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] OFDM implementation

From: Brett Trotter
Subject: Re: [Discuss-gnuradio] OFDM implementation
Date: Thu, 14 Jun 2007 15:32:18 -0700 (PDT)

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 address@hidden 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

address@hidden 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 ?
  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)
"/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)
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?
View this message in context: 
Sent from the GnuRadio mailing list archive at Nabble.com.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]