Re:Real Data only Transfer?

GNU Radio
1

Ouch!

This sounds like some of those previous threads.

Why do you want 16MS/sec real instead of 8MS/sec complex?

Eric

I didn’t want to go there, the part I was worried about is to have no
processing
since the CIC filter has some unpleasant properties (not very flat,
aliasing at the borders).

From my point of view the PC is much more accessible than the FPGA. To get an understanding of the algorithms I don’t have to try to read
someones Verilog code, and to change any algorithms I don’t have to
write Verilog. On the other hand the PC should be quite capable
in handling most signal processing tasks.

I’m generally interested in working with FPGAs but I don’t have a logic
analyzer, so that actual experiments might be cumbersome.

Anyway, I saw today that there is an fpga version with a halfband filter
now, very nice.

If you look at the analog part of the two alternatives, I must admit,
that if you keep the input bandwidth the same (8MHz), analog filter
requirements would be quite relaxed with the normal usrp.

Well, well I think I should just stay with what I’ve got for now.

Regards,

Kilian

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2

On Wed, Jun 07, 2006 at 07:04:00PM +0200, Kilian Timmler wrote:

Ouch!

This sounds like some of those previous threads.

Why do you want 16MS/sec real instead of 8MS/sec complex?

Eric

I didn’t want to go there, the part I was worried about is to have no processing
since the CIC filter has some unpleasant properties (not very flat, aliasing at the borders).

The final stage of the 8MS/sec path is run through a halfband filter
and thus is pretty flat. That is, the final decimation-by-two is
performed using a 31-tap halfband, not a CIC.

From my point of view the PC is much more accessible than the
FPGA. To get an understanding of the algorithms I don’t have to try
to read someones Verilog code, and to change any algorithms I don’t
have to write Verilog. On the other hand the PC should be quite
capable in handling most signal processing tasks.

Yep.

I’m generally interested in working with FPGAs but I don’t have a
logic analyzer, so that actual experiments might be cumbersome.

Simulation goes a long way. Or just “get it right” the first time :wink:
See also icarus verilog.

Anyway, I saw today that there is an fpga version with a halfband
filter now, very nice.

Eric