Prateek Dayal wrote:
On 4/4/06, *Robert McGwier* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
http://www.cds.caltech.edu/~yasi/publications.html
<http://www.cds.caltech.edu/%7Eyasi/publications.html>
Also for frequency offset, what really matters is not the frequency
offset in Hz, but the relative frequency offset delta_f/F_s, where F_s
is the subcarrier spacing. Please look at
*BER sensitivity of OFDM systems to carrier frequency offset andWiener
phase noise*
Pollet, T.; Van Bladel, M.; Moeneclaey, M.
Communications, IEEE Transactions on
Volume 43, Issue 234, Feb/Mar/Apr 1995 Page(s):191 - 193
Digital Object Identifier 10.1109/26.380034
In general if your relative frequency offset is .01 or less, I think
you will not be affected much. But again I am not too sure for DQPSK.
Again QAM is more sensitive to these errors than QPSK.
Please correct me if I am wrong somewhere. I am sharing what I have
recently learnt about these things ....
Regards
Prateek Dayal
Thank you very much for the reference. This was a very nice link to
Mostofi's work. The following paper is also pertinent to Jen's thinking
on the guard interval offset being irrelevant. It is not of course:
*Y. Mostofi*, D. Cox and A. Bahai, "Effect of Timing Synchronization
Errors on Pilot-aided Channel Estimation in OFDM: Analysis and
Solution," /Proceedings of 5^th IEEE International Symposium on Wireless
Personal Multimedia Communications (WPMC),/ Honolulu, Hawaii, Oct. 2002,
pp. 1309-1313.
http://www.cds.caltech.edu/~yasi/papers/WPMC02.pdf
Best wishes,
Bob
--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity. Guilty as charged!
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