[USRP-users] Simple BPSK modulation with alternating 1's and 0's

Moon, Seung - Exelis Seung.Moon at exelisinc.com
Wed Jul 22 14:54:54 EDT 2015


I'm currently working an intern, and my teammate and I are trying to generate a simple BPSK modulated signal.
We both lack knowledge on GNURadio and communications for our project, so we are hoping to get some help online.
Currently, I have a repeating vector source of alternating 1 and 0 which feeds into PSK modulator block (constellation point: 2, gray code: Y, differential encoding: Y, sps: 4, excess BW: .35) which feeds into a throttle block (sample rate: 32k) which then feeds into a GUI sink.
On the GUI constellation diagram, we see some points that are not situated at +1 and -1.
We are not sure on how to interpret what we are seeing on the constellation diagram.
>From my understanding, BPSK modulation modulates our data to +1 and -1.
Ultimately, we will be using USRP B200 to transmit our signal to lock on to a receiver which expects a BPSK modulated signal at certain data rate (let's say 1kbps).
We are also unsure on how to transmit our data at the desired data rate.
Any guidance will be greatly appreciated.
Thank you for your interest. Have a wonderful day.


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