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Software Defined Radio on Xilinx Virtex 4

Hello, Let me right again in this forum on the same topic. But know in English. Whatever my English is very poor. I am working for about 4 month's ego with an ML405 Xilinx Virtex 4 board and I wanted now to implement a Software Defined Radio (SDR). I understand everything that relates to SDR (theory, operation, Etc..) Very good. Likewise, I also understand VHDL and VERILOG. Now I would like to know if someone is thus also employs An SDR Board on the above (or others) to implement appropriate Experience exchange.

In following a detailed overview of what I Made now:

First, I strive times only to receive an AM signal.

Hardware is on the board as much: DA converter (LM4550) National and an external A / D converters (LTC2208) by Linear Technology. I have prepared all software developed (ADC.vhd, DAC.vhd, DDC.vhd ,...)I make already the simulation. Now, I must try my signals: and with a Function generator, I would like to generate a sine wave, and then the sine wave through the FPGA with the process by the AD and DA converters. I Am suppose to have the same signals again after the DAC.

Example. Sine (1Khz) ----> ADC -> FPGA ---> DAC ---> sinus (1Khz) I can hear something (signal) at the output (by the DA converter) with the Headphones. However, I cannot measure it with the oscilloscope. I had already tried without much success, and ask what the problem Lie? Whether it down sampling, or rather in a Clock functions?

Did someone get an idea or a tip for me?

I look forward to all suggestions and thank you in advance...

Chindji

Reply to
auguste.chindji
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Chindji,

There's not enough information in your post to be able to effectively troubleshoot your problem.

This is what I'd do:

1) Write some HDL code to generate a fixed output from your DAC. Make sure this works. 2) Apply a constant DC level to your ADC. Check that this makes it from the ADC to the DAC. 3) Go back to testing your sine wave.

Tell us the results. :-)

BTW, using an FPGA for an SDR when you're just beginning probably isn't the best idea; I'd suggest using a PC or at least a DSP instead. The performance is lower, of course, but it's *much* easier to debug when things don't work.

---Joel

Reply to
Joel Koltner

Could you please check in Wikipedia on the definition of "Cross posting". There'll be a definition of multiple posting, which is what you're doing now.

This would not be a bad topic to cross-post to the three groups that I mentioned in reply to your multiple post on comp.arch.embedded, but please don't multiple-post -- it's a pain to us, and reduces the value of the thread to you.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
Reply to
Tim Wescott

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