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Re: [Discuss-gnuradio] transmitting a bit stream

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] transmitting a bit stream
Date: Wed, 12 Mar 2008 10:36:14 +0000
User-agent: Thunderbird (Windows/20080213)

Atita Shirwaikar wrote:

I am new to GNU radio.I was aiming to transmit a string of ones using
BPSK modulation.
I am not using benchmark_tx.py for this as i do not want to send any
headers etc.
I just need to transmit a continuous stream of all ones...

I am using gr.vector_source_b to generate this bit stream.Then unpacking
it using gr.packed_to_unpacked
followed by chunks_to_symbols.
Am writing the output from chunks_to_symbols to the usrp sink..

I cannot seem to get this working..Is this the right way to do it?

You'll likely need to interpolate it. Follow the example in gnuradio-core/src/python/gnuradio/blks2impl/dbpsk.py where we root raise cosine filter it and interpolate by some number of samples per symbol. You'll need to match this sampling rate and the interpolation value in the USRP to get to the 128 Msps DAC.

Transmitting a string of 1's is a bit of an odd application. What are you aiming to do with that?


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