Sounds great. I'll give it a shot and report the result later. On Sun, Feb 27, 2011 at 4:30 PM, Tom Rondeau <trondeau1...@gmail.com> wrote:
> On Wed, Feb 23, 2011 at 5:41 PM, Tuan (Johnny) Ta <ta.tu...@gmail.com>wrote: > >> A lot of people seem to have problem with the OFDM receiver in gnuradio. >> Since there's no confirmation of a working *2-way* communication using >> OFDM yet, I've decided to dig into the OFDM receiver implementation. I want >> to test the performance of the OFDM synchronization block. To do that, first >> I want to isolate the ofdm_sync block and make sure the rest of the chain >> works. >> >> I found that there is a test file for OFDM mod and demod, named >> ofdm_mod_demod_test.py, without invoking OFDM synchronization, FFT, preamble >> and cyclic. However, that code is outdated and not applicable for the >> current implementation. >> >> I'm trying to generate similar test code for the current version of OFDM >> mod and demod but there seems to be no straight-forward way. It used to be >> that we can hook the ofdm_mapper straight into an ofdm_frame_sink. It's no >> long the case as the frame_sink now requires a 2nd input, which is a stream >> of bytes signaling the beginning of a symbol. This input is provided by >> ofdm_frame_acquisition, which in turn requires the signaling from the >> ofdm_sampler. The ofdm_sampler gets the signaling from the ofdm_sync x_x. >> >> Long story short, I haven't found a way to test the system while bypassing >> the ofdm_sync block yet. Can anyone give me some suggestion? >> >> Thanks a lot, >> >> Johnny >> > > Johnny, > Try using the "fixed" version of the ofdm_sync block found on line 96 of > ofdm_receiver.py. This takes information about what you expect the timing > and frequency offset to be and does nothing but use that to trigger the > follow-on components. It was made for doing exactly the kind of things you > are looking at doing. > > Tom > >
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