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Re: [Discuss-gnuradio] Last two data Blocks are always missing

From: kaleem ahmad
Subject: Re: [Discuss-gnuradio] Last two data Blocks are always missing
Date: Tue, 12 Aug 2008 09:23:25 -0700 (PDT)

Dear Brian,

Thanks for your suggestion, it solved my problem as I am padding 0's equal
to one block size at the end. 

But now I have to bear an overhead of one block size all the time, In my
application all the time I have to send one block of data. So it means that
for every packet I have to add an extra packet.

Best Regards

Brian Padalino wrote:
> On Tue, Aug 12, 2008 at 11:39 AM, kaleem ahmad <address@hidden>
> wrote:
>> Dear Brian,
>> I have tried with different payload sizes and the maximum value I tried
>> was
>> 1024 bytes. But in all cases I never received last Block (Sorry in my
>> first
>> post I mistakenly wrote last two blocks, it is actually the last block
>> only).
>> The length of transmit side filter is 125 and that of received side is
>> 25.
>> Can you please explain how can I flush or clear the filters as you said:
>> "To alleviate, you may want to flush the filters out with all 0's for
>> at least the length of 1/2 the taps, but it might be better to clear
>> the whole thing just so if you decide to start a new burst, the filter
>> doesn't have anything left over to cause some weird transients at the
>> beginning of the burst."
>> Please give me a clue with little code if possible.
> I really have no idea how to do it in code in GNU Radio.  The easiest
> thing to do is just transmit an extra block of data and ignore it at
> the receiver.  The smart thing to do is to zero the input to the
> filter and run it for the total length of the filter taps.
> Good luck writing the code for it.  I'm interested to know if this
> fixes your problems.
> Brian
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