Re: [Discuss-gnuradio] packet sending part

[Martin Braun]

Sure you can change the tx rate, but I'm not sure what you're asking.

Maybe you can start a new thread, and explain what you're trying to do.

M

On 03/24/2016 07:02 PM, SangHyuk Kim wrote:
> HI,
> 
> I checked those files, but I'm using recent version
> 
> I think this is related with usrp Tx rate.
> 
> In usrp_sink_impl.cc, I found function work(noutput_items, input_items,
> output_items). It sends packet to air.
> 
> And I check how many items are passed at this part.
> Most of all is 4096 or 8188 (I think 4096 is maximum packet size but, I
> don't know about 8188), however, these numbers are unstable
> 
> My question is
> 
> Can I change usrp Tx rate ? or this is fixed ?
> 
> Thanks
> 
> 
> 
> 2016-03-25 9:57 GMT+09:00 Martin Braun <address@hidden
> <mailto:address@hidden>>:
> 
>     SangHyuk,
> 
>     you're not using the more recent OFDM blocks, so you won't get a lot of
>     support here -- I recommend moving to the tx_ofdm and rx_ofdm stuff
>     instead.
> 
>     Cheers,
>     Martin
> 
>     On 03/24/2016 04:04 AM, SangHyuk Kim wrote:
>     > Hi,
>     >
>     > I'm trying to understand how OFDM packet Tx working
>     >
>     > I checked Tx rate and I got a poor rate
>     > (qam16, freq 1.18GHz, BW 25 MHz, pkt_size 400 --> 4.0 Mbps)
>     >
>     > I found it's because msg_queue block when packet be inserted to tail
>     >
>     > When Tx calls 'send_pkt(payload, ..)', it make packet and insert
>     to tail
>     > of msg_queue.
>     >
>     > And delete_head is called by ofdm_mapper_bcv_impl::work.
>     >
>     > I tried to change queue limit from 4 to 0 (non-blocking) and it caused
>     > down my computer (maybe memory problem)
>     >
>     > In this point, I'm wondering which part calls ofdm_mapper_bcv_impl ?
>     > In other words, where is actual packet transmitting part ?
>     >
>     > Thanks.
>     >
>     >
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