Barker Sequence for QPSK I'm trying to implement a QPSK burst modulation and demodulation through a channel and I'm now considering the synchronization part.

I've read that Barker sequence were excellent option for this as their autocorellation looks like a dirac.

So far I know that they're composed of 1 and -1 and that the longest found is 13 characters long.

My question is the following:

Is there some adaptation of a Barker sequence for QPSK to make use of
the complex representation or do you simply send a classic sequence
using only 1 and -1 while you could use also i and -i?
Polyphase Barker sequences have been studied (Google throws up multiple hits), but from a practical viewpoint, it is usually simpler to use binary Barker sequences on the I and Q channels.