I had a MacBook Pro 2013 which also couldn't withstand more than ~ 8-9 MS/s w/o overflows on its USB 3.0 port. Not all USB controllers show the same performance level, not all of them actually get to the specified 5 Gb/s rate. I suggested you take everything as-is and test it on a computer with an Intel USB controller (also: see the benchmark and USB-version tests Xavier was referring to).
On Sun, Mar 10, 2019 at 7:59 PM Ayaz Mahmud via USRP-users < usrp-users@lists.ettus.com> wrote: > Trying to develop 802.11n (a 2 by 2 MIMO) standard by using two B210s. > Initially started with the existing flow of > GnuRadio/examples/digital/OFDM/tx.ofdm.grc. Lets take only the transmitter > side for this question. > > > > Things that are changed in OFDM.grc: > > 1. The OFDM allocator block: The sync word. It is changed as per the > rule of 802.11n. That is, we use preambles (STF/LTF…) > 2. Made two exact same chains (just copying one flow), which > previously was one, and fed into USRP-2 input ports. > 3. Sampling rate : 20 MSPS > > > > Problem : > > 1. Overflow occurs. (I am using USB 3.0 interface, on MAC). Two of the > interfaces connected with this same laptop. Max sample rate it can handle > is about 4MSPS. > > > > I have tried saving the files in the RAM and then transmit. Does not > improve the situation much. > > > > Need suggestions on where should I look for the fix. > > > > Thanks. > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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