On 01/21/2014 07:16 PM, Aditya Dhananjay wrote: > On Tue, Jan 21, 2014 at 1:03 PM, David Halls > <david.ha...@toshiba-trel.com <mailto:david.ha...@toshiba-trel.com>> wrote: > > Ah, I see. You want to isolate the effect of the channel. I believe > it will be difficult, if not impossible, to remove the slight jitter > of the trigger, even in very high SNR - perhaps others can comment/help? > > > Yes, that is correct. It is impossible to *eliminate* the jitter in > triggers from Schmidl-Cox. But I want to minimize it, and have edited > the plaueau/peak detector code to do just that. (all in a hackish manner!)
Hm, this will be hard to get right. After all, the Schmidl & Cox is an estimator and operates on noisy values. Unless your SNR is crazy good, there is always a chance of getting it wrong. And technically, even then. Two ideas: - You could remove the sync block and sync your rx/tx paths with other means (e.g. MIMO connector, it depends on your hardware). This makes the sync influence independent of the noise. - Reconsider if the phase rotation really makes your measurements invalid. You'll have a phase rotation in any case (due to channel, propagation time etc.). The timing-related phase offset is constant, after all, and the phase difference between sub-carriers depends on the sub-carrier distance, too. Perhaps it doesn't matter all that much? MB _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
