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Re: [Discuss-gnuradio] Using USRP to transmit and receive samples

From: JPL
Subject: Re: [Discuss-gnuradio] Using USRP to transmit and receive samples
Date: Mon, 21 Oct 2013 21:06:24 -0500

Hello, Martin

1. Would you please tell me where the "manual page" is?
Because I cannot understand 
How the Vector source works (tagged_streams.make_lengthtags((packet_len,),(0,).length_tag_name)?
and where the "Import"block grab the value from (from gnuradio.digital.utils import tagged_streams), (import numpy), and (import random)?
I just need to know how vector source related to those import block

2. And you are saying keep "vector source" block not replace with "file source" block.
How can vector source import and read my *.dat?

Thanks again.

On Mon, Oct 21, 2013 at 2:52 AM, Martin Braun (CEL) <address@hidden> wrote:
On Fri, Oct 18, 2013 at 06:00:48PM -0500, JPL wrote:
> Question:
> (1) should I just replace the "Vector Source block" into "File Source" in
> tx_ofdm.grc?

This won't work, the input expects a tagged stream (see the
corresponding manual page). You will need to split the file into
packets, and tag them with their length. Currently there's no automatic
way to do that.

> (2) the rx_ofdm.grc, again, am I right just replace "tag debug" with "file
> sink"?

This on the other hand should work, providing your receiver is actually


Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071

KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

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