|Subject:||Re: [Discuss-gnuradio] SRRC pulse shaping question|
|Date:||Wed, 5 Dec 2012 00:27:44 -0500|
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:
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.
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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 www.acsu.buffalo.edu/~gsklivan
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