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

From: Marcus D. Leech
Subject: [Discuss-gnuradio] complex bandpass vs real low-pass
Date: Wed, 02 May 2012 17:55:25 -0400
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

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 :-)

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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