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 However, that code is outdated and not applicable for the current implementation.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?