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fft on hardware??or DSP??
by pbijoy on Sep 19, 2006 |
pbijoy
Posts: 2 Joined: Apr 5, 2009 Last seen: May 26, 2019 |
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Hi
i am trying to use the Opencore FFT, i am first doing a simulation by
giving different inputs . but what i observe is this FFT generates lots of
unwanted frequencies or inotherwors the sidelobe rejection is poor.
is there any work around ?
bijoy
----- Original Message -----
From: Yan Zhang yzhang at m...>
To: "'cores at o...'" cores at o...>
Date: Fri, 21 Sep 2001 10:35:00 -0700
Subject: RE: [oc] fft on hardware??or DSP??
Title: RE: [oc] fft on hardware??or DSP??
>
> The FFT I am designing for opencores should do around 1 > point > every 10ns in an FPGA. This translates to 10us for 1024 > points. > Essentially it will be 'real time', allowing a continuous > stream of data > to be processed. I also have designed a real time FFT (512 points) logic for 100M ASIC and verified by FPGA. About speed parameter looks like you used at least 8 multipler and number's adders parallel, not pipeline. Thanks Yan
> -----Original Message-----
> From: gsg43 at r... [mailto:gsg43 at r...]
> Sent: 2001Äê9ÔÂ21ÈÕ 6:02
> To: cores at o...
> Subject: Re: [oc] fft on hardware??or DSP??
>
>
> Â
> Hi John,
> Are you implemeting pipelined fft?? The word real time fft is
> giving this meaning...
> which algorithm you are using and why?
> Shall we get enough speed with pipeline fft on FPGA? I mean
> routing delays may effect the design...
> IF not so which FPGA will be suitable...
> Is opencores giving code for free??
>
> I am trying to get brief idea on the fft implementation... I
> am planning to simulate(Integer C code) pipelined fft.
> Thank you,
> gayathri :-)
>
> ----- Original Message -----
> From: jdalton at asiaonline dot net dot au
> To: cores at opencores dot org
> CC: jdalton at asiaonline dot net dot au
> Date: 17 Sep 2001 21:03:23 -0700
> Subject: Re: [oc] fft on hardware??or DSP??
>
http://www.opencores.org/mailinglists.shtml
> > Hi folks,
> > Hello >
> > 1. What is the speed of fastest FFT availabe in the
> market till now? > > Not sure. >
> > 2. I have seen few xilinx FFT documents for virtex
> FPGAs saying 1024
> > FFT in arround 60us. Other DSP vendors giving much
> speed FFTs than
> > FPGAs.
> > So which is suitable for fastest FFT, either DSP or > FPGA or dedicated
> > chip.
> > what are the limitations in both.
>
> > 3. Can I get faster FFTs in FPGA than DSPs?
> > My guess is for long transforms, an FPGA will generally > have a higher thoughput, as it can do more in parallel. > A DSP could potentially have a shorter latency due to > more highly optimised multipliers. For very short > transforms > a DSP with multiple ALUs might be faster than an FPGA as > it can do > everything in parallel with optimised multipliers. >
> > 4. What are the advantages of FFT on FPGA than in
> DSP? > > See previous answer. > > Best wishes > John > > -- > To unsubscribe from cores mailing list please visit |
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