Hey Muller / Marcus, Yeah I also agree that multiplying with zeros and ones might be the easy way out !
This might sound very silly, but I was trying to implement & test this scenario in simple flow graph, where I have a signal source (sine wave with 1Khz, sample rate of 50K) and a vector source (0,1). Multiplying this both with a 2 i/p multiply block and o/p to a wx gui. I was expecting to see one full period of sine wave and then 1 period of zero. But it is not the case. I believe I am not taking into consideration of the time period when multiplying with vector source (as it does not have any time period of till which it should multiply 1s). And I am not sure how to do that. Can you please give me a clue 😊 Ayaz From: Müller, Marcus (CEL)<mailto:muel...@kit.edu> Sent: Saturday, July 14, 2018 6:36 AM To: discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org>; mle...@ripnet.com<mailto:mle...@ripnet.com>; ayazmah...@hotmail.com<mailto:ayazmah...@hotmail.com> Subject: Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup Hey Marcus, yep, good catch: 64 kHz is far too low a sampling rate; Ayaz, start with something like 1 MS/s. (also, what kind of CSI will you be getting when observing a 64 kHz wide channel? Are you looking for reflections that have a path length difference larger than (sandy gears turning in my head… ) more than 4.6 km? (by the way, your 1 kHz OFDM subcarrier spacing is something that you'd actually encounter in digital broadcast standards – DAB/DAB+ does exactly that, and that 1 kHz essentially allows for delay spread of up to 300 km) I'd agree, the easiest solution here would be just splitting your output sample stream in two, and multiplying one with 0 while the other is 1, and vice versa. Best regards, Marcus (the other one) On Fri, 2018-07-13 at 15:20 -0400, Marcus D. Leech wrote: > On 07/13/2018 01:08 PM, Ayaz Mahmud wrote: > > Hi Marcus, > > > > Here the .grc file. You might have to change the File Source (tx) & > > destination folder(rx) > > > > Ayaz > > > > > I get that you want to alternate "active" antennae, and there are > probably burst-tagging schemes that will do this, but I'm not an > expert on those. > > I'll also observe that you're asking for a 64K sample-rate. I'm not > sure that the B210 will go down that low in sample rate, so you may > have to > interpolate up to the minimum sample rate. > > If it were *my* problem, I'd probably have a couple of vector sources > of alternating 1s and 0s, interpolate them up to the desired sample > rate > X the switching interval, and multiply the stream going into the > USRP by that stream of 1s and 0s. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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