Tom, thanks very much. though I still not fully understand it I will read
the book u suggested.
Regards!
On Sun, Jan 23, 2011 at 1:04 AM, Tom Rondeau wrote:
> On Thu, Jan 20, 2011 at 10:30 PM, Marcus D. Leech
> wrote:
> > On 01/20/2011 10:22 PM, James Jordan wrote:
> >> Marcus, Thanks for repl
On Thu, Jan 20, 2011 at 10:30 PM, Marcus D. Leech wrote:
> On 01/20/2011 10:22 PM, James Jordan wrote:
>> Marcus, Thanks for reply.
>> That is make sense, so the point become how to convert the signal to
>> baseband.
> Oh, that's relatively easy--you multiply it with a complex signal at the
> same
On 01/20/2011 10:22 PM, James Jordan wrote:
> Marcus, Thanks for reply.
> That is make sense, so the point become how to convert the signal to
> baseband.
Oh, that's relatively easy--you multiply it with a complex signal at the
same frequency--that's
exactly how it's done in hardware, and it work
Marcus, Thanks for reply.
That is make sense, so the point become how to convert the signal to
baseband.
On Fri, Jan 21, 2011 at 11:11 AM, Marcus D. Leech wrote:
> On 01/20/2011 09:42 PM, James Jordan wrote:
> > Hi Tom,
> > This is very old topic. I have read a DSP book. But I find that I
> > st
On 01/20/2011 09:42 PM, James Jordan wrote:
> Hi Tom,
> This is very old topic. I have read a DSP book. But I find that I
> still not very understand channelizer.
> Why in channelizer use low pass filter, in my imagine channelizer will
> use band pass filter to filter each
> channel like that: 600M
Hi Tom,
This is very old topic. I have read a DSP book. But I find that I still not
very understand channelizer.
Why in channelizer use low pass filter, in my imagine channelizer will use
band pass filter to filter each
channel like that: 600Mhz baseband signal have 4 channel each channel have
100K
Tom, thank u very much.
On Thu, Dec 23, 2010 at 10:16 PM, Tom Rondeau wrote:
> On Thu, Dec 23, 2010 at 3:53 AM, James Jordan
> wrote:
> > Thanks Tom.
> > if I really don't know how pfb_channelizer_ccf and pfb_decimator_ccf do,
> but
> > they seem
> > use the same principle. And how to set the ta
On Thu, Dec 23, 2010 at 3:53 AM, James Jordan
wrote:
> Thanks Tom.
> if I really don't know how pfb_channelizer_ccf and pfb_decimator_ccf do, but
> they seem
> use the same principle. And how to set the taps?
Yes, they are based on the same principle, but the decimator just
extracts the 1 channe
Thanks Tom.
if I really don't know how pfb_channelizer_ccf and pfb_decimator_ccf do, but
they seem
use the same principle. And how to set the taps?
On Thu, Dec 23, 2010 at 2:49 PM, Tom Rondeau wrote:
> On Thu, Dec 23, 2010 at 1:19 AM, James Jordan
> wrote:
> > Hi Martin,
> > pfb_channelizer_ccf
On Thu, Dec 23, 2010 at 1:19 AM, James Jordan
wrote:
> Hi Martin,
> pfb_channelizer_ccf will seperate all channels, But I dont need each
> channel.
> I only need the channel I am interested in. Seperating all channels will eat
> a lot of CPU resource.
Not really. It's a very efficient algorithm
Hi Martin,
pfb_channelizer_ccf will seperate all channels, But I dont need each
channel.
I only need the channel I am interested in. Seperating all channels will eat
a lot of CPU resource.
I have check pfb_channelizer_ccf source, it finally use fftw to process
channelizer.
So can I directly use fft
Martin,
Thank u very much. But how much MHz is the limit in your word "a couple of
MHz"?
On Tue, Dec 21, 2010 at 6:19 PM, Martin Braun wrote:
> On Tue, Dec 21, 2010 at 06:02:44PM +0800, James Jordan wrote:
> > Hi all, I need to receive many narrowband signals, but usrp hard ware
> only
> > provi
Short answer: you can go as wide as your CPU will handle.
If you only need a few channels but they're separated by a few MHz, use
the frequency xlating filters to bring each channel to baseband. If you
have a regularly-spaced band, use the channelizer.
--n
On Tue, 2010-12-21 at 14:10 -0500, Walk
On Tue, Dec 21, 2010 at 06:02:44PM +0800, James Jordan wrote:
> Hi all, I need to receive many narrowband signals, but usrp hard ware only
> provide 4 RX,
> so I need to receive more than one narrowband signals per RX. Is my idea
> possible?
> I dont want to use more than one usrp to achieve that,
On Tue, Dec 21, 2010 at 06:02:44PM +0800, James Jordan wrote:
> Hi all, I need to receive many narrowband signals, but usrp hard ware only
> provide 4 RX,
> so I need to receive more than one narrowband signals per RX. Is my idea
> possible?
> I dont want to use more than one usrp to achieve that,
Hi all, I need to receive many narrowband signals, but usrp hard ware only
provide 4 RX,
so I need to receive more than one narrowband signals per RX. Is my idea
possible?
I dont want to use more than one usrp to achieve that, anyway which will be
an
option if my first idea can't work.
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