Streaming (not losing a sample) is different than just “observing” something.
I can capture a buffer of 2 million samples at 50MSPS (20 milliseconds), and stream that back slower – that’s longer than the PPDU (PLCP frame) size (5.484 ms) of 802.11ac I agree – that’s sub optimal if you want to capture 100s of frames at a time – but you can observe, and learn a lot without streaming. We test LTE10 and get performance metrics like that, so it can tell you a lot of what’s going on in the system. -Robin From: Kyeong Su Shin [mailto:kss...@uw.edu] Sent: Friday, October 06, 2017 3:17 AM To: Getz, Robin <robin.g...@analog.com> Cc: w xd <wxd920...@gmail.com>; GNURadio Discussion List <discuss-gnuradio@gnu.org> Subject: Re: [Discuss-gnuradio] cheap sdr platform Hello Robin Getz, and to whom it may concern: Sorry, the number was not based on my experiences - When I said 4MS/s, I was referring to the spec sheet ( https://wiki.analog.com/university/tools/pluto/devs/specs ) and personal experiences from someone else. Maybe that was an outlier, however. If it can do 10MS/s or higher, then maybe it can be used to observe some 10MHz LTE signals as well. Still a bit too slow for the typical 802.11 signals, but there are some 802.11 standards using lower bandwidths.. Regards, Kyeong Su Shin On Thu, Oct 5, 2017 at 9:01 PM, Getz, Robin <robin.g...@analog.com<mailto:robin.g...@analog.com>> wrote: Sorry for the delay – but there must be a host issue you are having – I can stream 8MSPS (no underflows/overflows), and others get higher (12 or so). If you are only getting 4 – I would be interested in following up, and understanding why. It should be much higher. -Robin From: Discuss-gnuradio [mailto:discuss-gnuradio-bounces+robin.getz<mailto:discuss-gnuradio-bounces%2Brobin.getz>=analog....@gnu.org<mailto:analog....@gnu.org>] On Behalf Of Kyeong Su Shin Sent: Friday, September 29, 2017 9:56 PM To: w xd <wxd920...@gmail.com<mailto:wxd920...@gmail.com>>; GNURadio Discussion List <discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org>> Subject: Re: [Discuss-gnuradio] cheap sdr platform To whom it may concern: As Marcus Müller said, ADALM-PLUTO is too slow for LTE/WIFI, unless you can come up with clever FPGA-level hacks dedicated for your jobs, or you are okay with NOT receiving signals from actual LTE/WIFI transmitters. It can only stably stream ~4MS/s(!) of effective sampling rate over USB, and I believe that it does not support 8bit streaming mode. I am not sure why it can only do approx. 4MS/s - especially since other SDRs can stream faster even with the USB 2. I'd also recommend LimeSDR mini (shipping this December, but please be advised that it can be delayed further). If you need to get a unit soon, standard LimeSDR could be your best bet. Also, if you want to implement your own BTS, you may want to look for a device that you can attach a stable external clock source. Regards, Kyeong Su Shin On Fri, Sep 29, 2017 at 9:04 AM, Vitt Benv <vitt...@gmail.com<mailto:vitt...@gmail.com>> wrote: Take a look also at LimeSDR... there is a "mini" version for about 150$. If I recall right it's a fullduplex 12 bit ADC/DDC, ranging 1MHz / 6GHz with 20 MSPS, with USB port. https://www.crowdsupply.com/lime-micro/limesdr-mini#details-top victor Il 29 set 2017 10:21, "w xd" <wxd920...@gmail.com<mailto:wxd920...@gmail.com>> ha scritto: Hello guys, Have some suggestion on the cheaper SDR platform for us to use with the GNURADIO software? As a student, I cannot buy the expensive usrp ,but I want to learn the knowledge by the hardware and software. Any recommend? For example,use the hardware to do some experiments about LTE/WIFI. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org<mailto:Discuss-gnuradio@gnu.org> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org<mailto:Discuss-gnuradio@gnu.org> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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