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Digital wireless systems

Discussion in 'Electronic Design' started by john, May 12, 2008.

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  1. john

    john Guest

    Hi,

    I programmed Spartan chip to produce serial data ( main_Clock, Data
    Clock, Data and Tag ) stream for a DAC. I need to make this system
    work with out wires. The main clock is 3MHz, Data clock is 1.5MHz. Can
    anybody advice me how to make it digital wireless ( Transmitter plus
    receiver). I have not done anything like this before. The DAC will be
    at 6 feet away from the Spartan chip.

    Thanks
    John
     
  2. linnix

    linnix Guest

    The best way is to modulate your signal at 5.8GHz and embed the phase
    correction data into the data stream. I assume the data flow is one-
    way only.
     
  3. john

    john Guest

    Hi,

    Yes, The data is flowing in one way. Would you please suggest some
    hardware. I am also thinking about bluetooth. Please advice!

    Regards,
    John
     
  4. linnix

    linnix Guest

    Bluetooth will not give you 1.5MHz data rate. In fact, 5.8GHz might
    not be enough, but the next ISM band is 25GHz.
     
  5. john

    john Guest

    Any suggestions regarding Hardware?
    Regards,
    John
     
  6. linnix

    linnix Guest

    The Atmel ATR2820 RF Transceiver would be a good start, but I can't
    design your apps without knowing the full spec.
     
  7. Rich Webb

    Rich Webb Guest

    One-off project or a few dozen or a few hundred thousand? Per week?

    A hobby/learning/grow-your-brain project or for sale (and use) by a
    third party?

    Will UL/CSA/EC/FCC/etc. certification be required?

    Are the consequences of a communications failure: none, benign, pretty
    bad, or someone dies?

    Is this for a medical application (noting that your IP block is from
    Wayne State University Medical Center)?

    With that out of the way, if you can grind down the data rate a bit
    (no pun intended), you're close to being able to use an off-the-shelf
    solution like an XBee module, advertised to top out at 1 Mbps.

    <http://www.sparkfun.com/commerce/product_info.php?products_id=8695>
     
  8. linnix

    linnix Guest

    Take a look at the RF data rate of 250Kbps. Does it mean the same for
    me as for you?
     
  9. john

    john Guest

    Hi,

    What do you think about Texas Instrument's IEEE 802.16 (WiMax) chip
    set ( TRF1X/2X RF Chipset ).
    Please advice!

    Regards,
    John
     
  10. linnix

    linnix Guest

    Forget about Bluetooth, WiFi, XYZBee, WiAnything. If you want
    slicings or channelings, you need 25GHz. To get 1.5MHz data rate, you
    need the full bandwidth for 5.8GHz.
     
  11. john

    john Guest

    Why do I need the bandwidth of 5.8GHz. Please advice!
    John
     
  12. linnix

    linnix Guest

    Radio Freguency Modulations and Demodulations.
     
  13. john

    john Guest

    Hi,

    48 bits at 1.5Mhz rate?

    John
     
  14. linnix

    linnix Guest

    Never mind, Bluetooth 2.0 would be fine. I thought you mean 1.5Mbps
    sustained.
     
  15. linnix

    linnix Guest

    Not sure if he meant 48 bits per second, per millisecond or per
    microsecond.
    Not so, Wifi are rated at burst data rate, not sustained rate.
     
  16. linnix

    linnix Guest

    And you probably want his spartan FPGA to talk ethernet as well.
     
  17. Rich Webb

    Rich Webb Guest

    Apparently not.
     
  18. linnix

    linnix Guest

    Sure, if we are looking for a $200 solutions, we can build multi-TX,RX
    radios. We don't have to deal with channels and/or routings as well.
     
  19. john

    john Guest

    Hi,

    So, I need customized hardware to do this. Are you guys sure that
    there are no chips available to do what I want to do? Any suggestions
    or pointers that how should I proceed. I have FPGA generated clock and
    data stream . Data is 48 bits wide and I am serially outing the data
    at 1.5MHz.

    Regards,
    John
     
  20. linnix

    linnix Guest

    So you are dealing with 1.5Mbps. In theory, 5.8GHz 802.11n can
    handle it. But with all the overheads of channellings and routings,
    it will not guarantee the data rate. Your FPGA would have to talk
    ethernet/TCP/IP in this case. You can bump it up with Multi-
    Transceivers as another poster suggested, but it will not be cheap.
    Your best bet is to do a simple modulation/protocol at 5.8GHz.
     
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