On Thu, Feb 25, 2010 at 04:16:20PM +0100, Daniele Bertussi wrote: > Good morning, > I need to implement a double 802.15.4-802.11b transmitter that transmits > packets in asynchronous (or aperiodical) mode. > I realized a simple program where the output of the two trasmitters are added > together to generate the output stream. > Unfortunately, when one of the two transmitters ends to generate a packet, > also the other one stops. It happens ( i think! ) because there are no > samples for the adder to combine with and the forecast() method stops the > execution. > By the way, I found online a similar discussion: > http://www.mail-archive.com/discuss-gnuradio@gnu.org/msg08387.html > In order to have a countinuos output stream even when the two transmitters > are inactive, could I implement a gnuradio c++ block with the following > characteristics? > -performs a continuous production of null samples (when there are no input to > the block) > -lets the samples unchanged if there are samples at his input.
I wrote some code a while ago that attempted exactly that (I'll email you the stuff off-list), but you need to be careful that it does exactly what you want. At the very least, put in a throttle or you'll end up creating billions of zeros before the scheduler comes round to insert your signal. MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-3790 Fax: +49 721 608-6071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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