Only one point in a S-Band BPSK constellation

discuss-gnuradio

From:	יותם זיס
Subject:	Only one point in a S-Band BPSK constellation
Date:	Wed, 19 Apr 2023 18:59:48 +0300

Hello, we're students trying to build an S-Band BPSK modem.

Transmitting using UHD-USRP b200 and receiving with Lime-SDR Mini.

We have a problem when working with a high bitrate, 1Mbps with 8 sps:

Only one point is showing up in the constellation. When we worked in 9600bps it worked just fine.

In addition we're also using gr-lfast blocks to make it possible to run our program without maxing out the CPU.

Attached screenshots of our uplink and downlink flowgraphs and the GUI.

Thanks and 73

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Only one point in a S-Band BPSK constellation, יותם זיס <=
- Re: Only one point in a S-Band BPSK constellation, Jeff Long, 2023/04/20