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Re: [Discuss-gnuradio] Managing Tags in Multiple Streams

From: Ramazan Çetin
Subject: Re: [Discuss-gnuradio] Managing Tags in Multiple Streams
Date: Mon, 8 Jul 2019 14:23:27 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2

Hello again,

We have also tried "add block" for combining two tagged streams. However, add block ignores packet boundaries. This causes "tP" error on USRP side due to sending another tagged packet before finishing previous one. In attached figure, this situation can be observed.

We just need to send packets to USRP device from two different TAP interfaces. We need a block like FIFO. The packet that comes first from one of the inputs should be sent first. After finishing this, another packet should be sent.

Is there any solution for this problem?

On 5.07.2019 17:07, Ramazan Çetin wrote:
Hello all,

We want to transmit two channels OFDM signal. Each channel has 500kHz bandwidth.

We want to connect each channel to  TAP interfaces. At the end, we have two OFDM receivers and two OFDM transmitters. We are getting trouble with putting tags these two streams (from TAP0 and TAP1). The messages that comes from TAP0 and TAP1 interfaces are different sized. We have combined these two OFDM TX paths using "Tagged Stream Mux". The disadvantage of this block is that it waits length tag from both of the inputs, so we can send data when both of the interfaces are active. But we should also send when one of the channels is active.

The GNU Radio FG is attached. So, how can we send multiple tagged streams to USRP device? Does using Tagged Stream Mux is true approach for this task?

You may suggest another approach.

Best regards.


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