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Re: [Discuss-gnuradio] Problem with USRP!
From: |
huzaifazafar108 |
Subject: |
Re: [Discuss-gnuradio] Problem with USRP! |
Date: |
Sun, 8 Apr 2012 14:23:53 -0700 (PDT) |
Dear John,
Thank you for such a prompt reply. Okay, we will remove the throttle blocks
just now. But can you guide us how to achieve symbol synchronization then?
Best Regards,
Huzaifa
John Malsbury wrote:
>
> You do not need to use throttles when using a UHD sink/source, because
> the device provides timing for the flowgraph.
>
> Remove the throttles and try again. If you still see the failure I'd
> say you are not achieving symbol sync.
>
> -John
>
>
>
> On 04/08/2012 01:58 PM, Huzaifa Zafar wrote:
>> Dear all,
>>
>> I am working with 3 people on a project involving GNU Radio and USRP1.
>> We have tried to implement a simple point to point digital
>> communication system in GRC involving DQPSK modulation. Using a vector
>> source we are sending a finite stream of zeros and ones (the vector
>> source has Repeat set to yes). On the receiver side, what we receive
>> is really very strange: The same stream of zeros and ones, but with
>> extra zeros in between our actual data. For example, we send three
>> ones and three zeros, but what we receive is a one followed by seven
>> zeros, another one followed by seven zeros, another one followed by
>> seven zeros, and then a zero followed by seven zeros e.t.c. We tried
>> to experiment more by using the 'KEEP 1 in N' block and the
>> 'DECIMATING FIR FILTER', but things are not working out the way they
>> should.
>>
>> I am also attaching a snapshot of the .grc file for your reference.
>> Please tell us the reason why these extra zeros are present between
>> our data bits, and the way to combat this effect (remember that the
>> decimating fir filter and keep 1 in N block are not showing the
>> desired output). Any kind of help is appreciated in advance.
>>
>> --
>> Huzaifa Zafar
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
--
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- [Discuss-gnuradio] Problem with USRP!, Huzaifa Zafar, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, John Malsbury, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!,
huzaifazafar108 <=
- Re: [Discuss-gnuradio] Problem with USRP!, huzaifazafar108, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, Marcus D. Leech, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, huzaifazafar108, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, John Malsbury, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, huzaifazafar108, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, John Malsbury, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, Marcus D. Leech, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, John Malsbury, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, huzaifazafar108, 2012/04/08
- Re: [Discuss-gnuradio] Problem with USRP!, huzaifazafar108, 2012/04/08