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)
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