AFAIK the answer is no, because each 802.11 frame starts with preable which is transmitted over slowest speed so everyone could understand.
However I've heard that doesn't apply for historic 802.11 (not to be mistaken with 802.11 b/g) which would than appear as noise floor, but it is up to Aruba TAC to confirm.
What is background of your question?
I have a customer issue in with warehouse deployment with this symptoms:
-AP's periodically report noise floors 65-70dB , a while later -90dB
-it goes in cycles circa 20sec high noise floor, 40 sec normal noise floor and that repeats forever
-onsite inspection didn't find any obvious interference source
-support case with spectrum analysis didn't identify any interfence source