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Re: [Discuss-gnuradio] USRP N210, sometimes, cannot receive packets


From: Jeff Long
Subject: Re: [Discuss-gnuradio] USRP N210, sometimes, cannot receive packets
Date: Thu, 25 Jan 2018 10:15:03 -0500

Try breaking this up into 3 separate programs and start the receivers first. It might be that the receivers aren't even getting started before the transmitter is done.

On Thu, Jan 25, 2018 at 8:38 AM, Kurniawan Irianto <address@hidden> wrote:
Hi Jeff,

I am really sorry for the unclear description of my setup. I build my program on python so I don't have GRC file but the flowgraph is similar to the attached GRC file.

Maybe this could make more clear about my setup. I have 3 USRP nodes (N210s) that act like Source and 2 Sinks. I connect the USRPs to a PC (Personal Computer) through a switch. At the USRPs, there is no GPSDO. I run the USRPs in one flowgraph and from a PC. Hopefully, the attached GRC file will make it clear about my program.

Thank you so much for your time.

Kirianto


On 25 January 2018 at 12:45, Jeff Long <address@hidden> wrote:
I can't understand your setup from the description, maybe a GRC file or source code would help. In any case, it sounds like you may have 3 USRPs tied together in one flowgraph, which could cause a problem.

On Thu, Jan 25, 2018 at 6:13 AM, Kurniawan Dwi Irianto <address@hidden> wrote:
Hi Jeff,

Thank you for your quick response. I didn't do anything with the clock sync since I don't have gpsdo embedded on the N210 or any sync devices. I just used the normal setting for usrp_source and usrp_sink. I set up the antenna for  tx gain to 35 and rx_gain to 15. I assume the clock sync is the problem. And for the sample rate, I used 2 Msps. For the flowgraph, I used file source block for the data I want to transmit and source sink block to receive the data. If the the sink nodes could receive the packets, I could see and read the file from the source node. My program is in no GUI mode, so I can only read the file. If the sink can receive the packets, I can read the file without any errors. But sometimes it cannot receive any packets. I am not sure. Perhaps it can receive the signal but cannot decode the packets.

Thanks again for your feedbacks.

Kirianto


On 25 January 2018 at 11:51, Jeff Long <address@hidden> wrote:
How are the clocks in the N210s synced? What rates are you using? What symptoms are you seeing that tell you the sinks are not receiving packets?

On Thu, Jan 25, 2018 at 5:34 AM, Kurniawan Dwi Irianto <address@hidden> wrote:
Hallo guys,

I have a configuration using gnuradio-companion as follows;

#########              #########              #########
# sink_1 #  <- - - - -  # source #- - - - - --># sink_0  #
#########              #########              #########

The devices I am using are USRP N210s and it is with SBX daughterboard and without GPSDO. The distance between the nodes is 1 meter. I use BPSK Modulation to transmit the packets and the frequency is 2.485 GHz. I would like to broadcast packets from source to sink_0 and sink_1. One of the sink can receive the packet but the other one hardly can. In 10 times run of the program, both of the sink can successfully receive the packets only 1 or 2 times. Most of the run, only one sink can receive the packets. Moreover, If I disable one of the sink and run of the program to transmit the packet from source to sink. In the 10 times run, the sink can receive it only 5 or 6 times. There are 4 times it fail to receive the packets. I have known yet where is the problem. Any suggestion would be helpful.

Thank you in advance.

Best regard,
Kirianto

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