BERT Tester implementation

[incisive]

Hi,

I have an NI 7962R FPGA with 6587 adaptor module, PXIe 8135 controller. I need to implement Bit Error Rate testor. My requirment is 200Mbps data rate. How do I implement it? Do I need any some  module specified for BERT testing by NI? Which licensed Tool do I need to purchase?

Thanks

[mikeporter]

I am not aware of a BERT toolbox. How much experience do you have with LabVIEW? This is not a trivial effort. Wouldn't a better solution be to buy someone's commericaly available tester and a gpib interface?

Mike...

[DavidBoyd]

Agree with Mike here... this is definitely a non-trivial development effort.  That said, what little I recall from my days of using a (commercial) BER tester (and don't ask about getting what I used - look up Tautron BERTS-25 and you'll get an idea of how long ago this was), the transmitter generated pseudorandom bit sequences using a maximal-length linear feedback shift register (LFSR), which is a great Google search term (hint, hint).

In fact I used this technique several years later (still in days of yore), only this time I wrote some code in C which generated such sequences.  What makes LFSRs great is that you can always compute the next value from the present one, so synching on the return path data is easy; the rest is all about counting errors, and deciding when you're hopelessly lost (can't get next value to match over several symbol times).

Good luck, sounds like a fun project, especially if the deadline is still off in the haze

Dave

Edit: I re-read my post and all my typos were for the missing letter "u".  I blame the hardware.

[incisive]

Yeah right but I was thinking for some NI solution..
This is what I found: http://www.ni.com/example/7938/en/