I have a question that why in 802.11a IEEE standard, the PLCP long training sequence takes the GI2(Guard interval 2) as the prefix of two OFDM symbols, not one GI before one OFDM and the other GI before the second OFDM symbol? What is the advantage of that?? The following includes the IEEE 802.11a 1999 version: http://standards.ieee.org/getieee802/802.11.html Thanks.
802.11a PLCP training sequence question
Started by ●March 16, 2006
Reply by ●March 17, 20062006-03-17
"ofdm2006" <qjqflash@hotmail.com> wrote in message news:ENOdncwFuMRYl4fZnZ2dneKdnZydnZ2d@giganews.com...> I have a question that why in 802.11a IEEE standard, the PLCP longtraining> sequence takes the GI2(Guard interval 2) as the prefix of two OFDMsymbols,> not one GI before one OFDM and the other GI before the second OFDM symbol? > What is the advantage of that?? > > The following includes the IEEE 802.11a 1999 version: > http://standards.ieee.org/getieee802/802.11.html > > Thanks. > >My guess is it's to provide maximum separation from the short training sequence. Since T1 and T2 are the same thing you don't need a guard interval for them, but you would have problems if t1-t10 bled over into the long preamble. -Clark
Reply by ●March 28, 20062006-03-28