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Re: [Discuss-gnuradio] complex bandpass vs real low-pass

From: Nick Foster
Subject: Re: [Discuss-gnuradio] complex bandpass vs real low-pass
Date: Wed, 2 May 2012 14:59:25 -0700

On Wed, May 2, 2012 at 2:55 PM, Marcus D. Leech <address@hidden> wrote:
I have been in the habit of using complex-bandpass filters even when I'm just looking for a symmetric response.  I did some measurements
 today and found a 40-45% performance advantage to using a low-pass real filter when a symmetric response is desired.  What's the "crux"
 of the performance difference?

Needless to say, I ran around and changed all my recent "stuff" to use low-pass filters :-)

Complex * complex multiplies are more computationally expensive than complex * real. For edification and titillation you can read the volk_32fc_x2_multiply_32fc source. There's an Orc version too which is easier to read. The moral of the story is you should probably avoid complex coefficients unless you know you need them.


Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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