Re: [Discuss-gnuradio] Scheduling a block even with no input items RE: Flow graph blocking when doing 2x1 transmission

[David Halls]

Hi Activecat,

I have disconnected the rest of the flow graph because it is extremely complex.

In the system I have a Source, a Relay (1 rx USRP, 1 tx USRP), a Destination.        S ---> R_rx/R_tx --> D

The two transmitters that you see on that flow graph snippet I sent you are the the Source Tx and the Relay Tx.

Payload TD Tx 1 is derived from input codewords that are generated in MATLAB and stored in a file, then loaded into the flow graph. The payload is created in a similar fashion to Martin's original OFDM_tx. This is then transmitted from Source Tx.

Until this point, no packets are received by Relay Rx but once the source transmits, these packets are then received by Relay Rx, and then there is a decode-and-forward chain of blocks, and this then creates Payload TD Tx 2.

The full flow graph is attached, but may be missing many blocks for you...

David
________________________________________
From: Activecat address@hidden
Sent: 04 June 2014 13:45
To: address@hidden
Cc: David Halls
Subject: Re: [Discuss-gnuradio] Scheduling a block even with no input items RE: Flow graph blocking when doing 2x1 transmission

On Wed, Jun 4, 2014 at 7:10 PM, David Halls <address@hidden<mailto:address@hidden>> wrote:
Activecat,

In fact my horrible hack doesn't work properly. Once items start arriving at Payload TD Tx 2, they still don't arrive as 'consistently' (for want of a better word), as those from the Noise Source block, and thus zeros are inserted when they are not required!

David


David,

Could you please explain in details, what is this Payload TD Tx 2?
How does it generate data, is it getting data from a hardware or console, why it sometime idle but sometime transmitting?

This is a virtual source. Where is it associated virtual sink?

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tx_ofdm_qmf_two_stage.grc
Description: tx_ofdm_qmf_two_stage.grc