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Re: [Discuss-gnuradio] SRRC pulse shaping question

From: Brian Padalino
Subject: Re: [Discuss-gnuradio] SRRC pulse shaping question
Date: Wed, 5 Dec 2012 00:27:44 -0500

You'll need to figure out how to flush the filter state and send actual 0+0j samples through.  Maybe you can set a flag and multiply the samples coming out by 1 or 0 depending if you are flushing or not?


On Wed, Dec 5, 2012 at 12:11 AM, George Sklivanitis <address@hidden> wrote:
The filter is consisted of 55 taps.
I tried by sending zeros. Though zeros are interpreted in -1's from the modulation mapping block.
Moreover, the zeros will be taken into account as symbols to be shaped, therefore, the same thing will happen.


On 12/5/12 12:07 AM, Brian Padalino wrote:
Have you taken into account the group delay of the filter?  How long is your filter?  Try sending zeroes at the end to flush your filter state?


On Tue, Dec 4, 2012 at 11:35 PM, George Sklivanitis <address@hidden> wrote:
Hello all,

I have a question applying to everybody that have tried transmitting symbols in different kinds of modulation (BPSK, QPSK, GMSK etc).
I am using the following configuration in GNU Radio ( random source block -> bytes to symbols -> SRRC block -> file sink)

The attached figure plots the generated symbols (+1,-1)  with red color along with the upsampled SRRC waveform (blue)
For some reason that I am not able to understand the last 8-bits do not have a correspondence with the waveform created. In other words
the waveform is "cut" at the last byte.
Can anyone help me with the above.


Sklivanitis Georgios
PhD Student

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Sklivanitis Georgios
Ph.D Student
Communications Division,
Department of Electronics and Electrical Engineering
University at Buffalo, The State University of New York
North Campus, Office 205, Furnas Hall
Buffalo, NY 14260

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