> Dear all, >> >> I am trying to use the alamouti code implemented by trondeau. >> Studying the gr_ofdm_frame_acquisition I found several concepts that >> are not clear to me: > > > Wow, this code is pretty old, and we never did finish it. I hope you get it > working! I'd love to see the results.
Yes I know... I am trying to implement alamouti and this is the only thing that I have found... do you know about newer code? and/or working one? > >> >> 1) d_phase_count: what does it mean? > > We have a look up table for various phase rotations to use in the > calculations instead of recalculating them every time. This is the index > into the LUT. In the code you never used "d_phase_lut"... so this explain a lot of things... > >> >> 2) coarse_freq_comp(int freq_delta, int count): which is the meaning >> of this function? > > If the frequency offset is larger than a subcarrier spacing, we want to > correct for that. Once the number of subcarrier offset is found, we use this > function to recenter it. The fine frequency correct has already been taken > care of to center the signals to the center of a subcarrier. > >> >> 3) what "-M_TWOPI*freq_delta*d_cplen/d_fft_length" represents? > > This is the integer number of subarriers (freq_delta) and the phase > correction per subcarrier. > >> >> Thank you >> >> Vanessa > > Tom > Thanks Vanessa -- Vanessa GARDELLIN, Ph.D. Researcher Institute for Informatics and Telematics (IIT), Italian National Research Council (CNR) Via G. Moruzzi 1 56124 Pisa - ITALY Phone: +390503153267 Room: B65/c E-mail: vanessa.gardel...@iit.cnr.it WWW: http://www.iit.cnr.it/staff/vanessa.gardellin/ Skype: gardellin.vanessa _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
