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Re: [Discuss-gnuradio] OFDM transmitter receiver

From: Martin Braun
Subject: Re: [Discuss-gnuradio] OFDM transmitter receiver
Date: Tue, 26 Aug 2014 11:10:53 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Try and not kill the context in a mailing list thread; these are also
archived and are used by others for referral.

Max frame size depends on max_output_buffer(). 80 symbols at a 64-sized
FFT would be ~40kB... that doesn't seem unreasonable. Not sure if
there's a problem here. I suggest you have a look at the buffer sizes to
track down this problem.


On 08/25/2014 03:31 PM, Martin Braun wrote:
> What's your kernel.shmmax value? (run sysctl kernel.shmmax)
> M
> On 08/25/2014 12:47 PM, sreena p h wrote:
>> Hi
>> I used the ofdm transmitter receiver blocks to create a simple system as
>> shown in the attachment. I used the system parameters as those used in
>> the example transmitter and receiver grcs. Now I get error that
>> 'Detected a packet larger than max frame size (80 symbols)'. I would
>> like to know how the max frame size is set and should I add more
>> information to the grc. 
>> My transmitter- receiver parameters
>> fft length= 64
>> cyclic prefix = 16
>> packet length = 96
>> no. of occupied carriers = 48
>> no. of pilot carriers = 4
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>> Discuss-gnuradio mailing list
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