Communicat​ions link test system (BER measuremen​t)

I am currently brainstorming ideas on how to create a bit error rate (BER) measurement system across an ethernet communications link. What I have been thinking of doing is, using shift registers and some logic gates to create a pseudo-random bit sequence on the transmitting side. This sequence will then be sent across the ethernet via UDP (not TCP since I want errors to occur at other end), and received and compared with a locally generated PRBS. I just wanted to know what kind of difficulties might I face (such as synchronization issues, protocol issues, feasibility, etc.) and if there may be a better method to accomplishing such a test system from someone who may have had experience with this. The point of this is to test a wireless 802.11a/g network injected w/ noise. Any suggestions would be much appreciated.
Thanks,
nilak

Hi Jerry,
Thank you very much for your reply.We are trying to introduce PXI solustion for semiconductor test for the production test. If the PXIe-5673 is capable of testing the IIP3, we would not willing to add one more signal generator.Because,you know,the test cost is very sensitive for the production test. The following is the test specification of DUT. Would you help to have a look?
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
Intermodulation intercept point (IP3)
Two-tones 900 MHz, 5 MHz spacing
+10 dBm each tone
0.5–3 GHz
46
dBm
As I can see from the datasheet of 5673:", NI PXIe-5450 is capable of producing more than 100 MHz of RF bandwidth". For the frequecy,I think it should be able to generate two-tones 900MHz with 5MHz spacing.Is it? But I am not quite sure about the Intermodulation Distortion (IMD3) of the PXIe-5673's signal if we generate it in this case. Do you have any information I can refer to?
It will be highly appreciated if you can give some suggestions on it.

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