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Re: [Discuss-gnuradio] Re: One simple question

From: Murtuza
Subject: Re: [Discuss-gnuradio] Re: One simple question
Date: Tue, 12 Aug 2008 11:19:06 -0500

Thanks for the replies. I think I have started to get a picture of what it really is. I want to implement a Direct Sequence Spread spectrum application for my work as I want to use it to implement a ad hoc network. I thought that, one could be implemented using Gnuradio and USRPs. I actually wanted to work towards generating a block that would generate PN sequences at the rate of 2Mbps for my work. I will be using gold codes as the PN sequences.

Is it possible to purely implement in software instead of programming the FPGA. As the rate is only 2Mbps isn't it possible to implement in  software only  given we have a good computer to work with ?

Correct me if I am wrong. I will really appreciate it.

Thanks again

On Tue, Aug 12, 2008 at 4:53 AM, Patrick Strasser <address@hidden> wrote:
Murtuza wrote am 2008-08-12 05:47:

 hi friends,

Can anyone tell me how one can implement a block that generates a sequence of bits at a rate of 2Mbps.

Have you had a look at the docu?
Look at
and especially at

Blocks in GNU Radio generally do not have a instrinsic speed but are constrained by the rate of their sources and sinks and of course by the speed of your machine. In a software-only (no USRP or Audio) applications you'd likely use gr.throttle.

I am new to Gnuradio and working towards implementing a sequence generator on gnuradio. I did not find any block which already does this (atleast this is what i believe is true).

Please be more specific in what you want to implement. Do you want to have very special sequences, or repeat sequences, or PRN? What do you need it for?
GNU Radio has a vector source, and you can load it with arbitrary values. You could also use a file as source and generate you data outside GNU Radio. Of course the file can be a pipe and you could use another program to generate your sequence on the fly.

Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at student dot tugraz dot at>
Student of Telematik, Techn. University Graz, Austria

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Mir Murtuza Ali
Graduate Student
Center for Wireless Communications
University of Mississippi
University, MS 38677
Ph : (M) 662-202-5472 , (R) 662-513-9903

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