Hello! what's the sampling rate you're using? Best regards, Marcus
On 26.10.2015 18:38, Washbourne, Logan wrote: > Hello all, > > I'm trying to take a step back from my previous postings and try a > simple approach to try and understand working with over the air > communications with the USRPs. Let me know if it would be better to > post this in the USRPs-Users list. > > I'm trying to have a simple TX and simple RX side so I can eliminate > and unnecessary complications. > > The TX side has the following flowgraph: Vector > Source(preamble+data)->DPSK Mod(DBPSK,2samples/symbol)-> Multiply > Const(.707) -> UHD:USRP SINK(2.448GHz center freq, 10dB default gain) > > RX Side: UHD:USRP Source(2.448GHz center freq, 10dB gain default) -> > DPSK DEMOD(DBPSK, 2 samples/ symbol, rest default values) - > file sink > > I'm checking the progress of the communication by looking at a > constellation plot that is connected directly to the USRP SOURCE block > on the receiver side. I'm getting a very elliptical shape, more spread > out in the horizontal direction but not by much. I'm also looking at > the bits from the receiver side in matlab and my preamble is not > showing up. > > These were the same problems I had when trying to use a correlated > system for OTA communications. I feel like I'm missing something > really simple. > > Does anyone know of a simple TX, RX grc setup that I can use to test > my USRPs? > > Again, I really appreciate the help you guys give. > > Logan Washbourne > Electrical Engineering Graduate Student > (Electromagnetics) > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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