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Re: [Discuss-gnuradio] Synchronization within the same USRP

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Synchronization within the same USRP
Date: Tue, 18 Oct 2016 22:15:09 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

Can you share what "lspci -v" says? The output of ifconfig isn't helpful here.

Anyway, a 0.0075 BER sounds reasonable, what's wrong with that? do the math on how many bits you need to receive incorrectly at the very beginning of your reception to get to that level within your observational window.

Then, also, do the math for error probability for your modulation. Real-world transmissions are *never* perfect. That's why you have all the fancy receivers!

Best regards,


On 18.10.2016 21:43, Aldalbahi, Adel wrote:
Hello Marcus,

PC is connected  to USRP via 1G ethernet cable. Here is my NIC for this specific setup:

eth1      Link encap:Ethernet  HWaddr 34:17:eb:a5:5a:f1 
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::3617:ebff:fea5:5af1/64 Scope:Link
          RX packets:38828790 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37442520 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:55487116438 (55.4 GB)  TX bytes:45938732293 (45.9 GB)
          Interrupt:20 Memory:f7d00000-f7d20000

USRP add was changed to .3. One more thing to mention going back to flow graph, the unpack k bits block if K set to 8 then i guess in this case I'm comparing bit by bit since K was mentioned in document to unpack bytes to bits according to the set k value. The BER gives 0.0078 after changing K, bits per symbols and unpacked to packed while bypassing the delay block. After simulating the same setup without the USRP i found 0.0075 BER instead of zero!! since there was no error introduced in the simulation.

Any suggestion ?

Thank you   

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