6 Mbit/s means the phy layer transmission data rate...
and -82 dBm means the recieved power level in dBm...so
the receiver will be busy for a valid OFDM transmission
at a receive level equal to or greater than -82
dBm.
If the preamble part of the packet has
not been received due to some reason , say collision,
in that case the sensitivity level is increased
to -62 dBm...so the receiver will be busy for a
valid OFDM transmission at a receive level equal
to or greater than -62 dBm.
--
MohaMMad
MuTTakin SiDDique, MSc. Engr
Communication Networks
University of Bremen, FB1
Otto-Hahn-Allee NW1
28359 Bremen, Germany
EMail:
mms@comnets.uni-bremen.de
Tel : +49 421 218 3339
Fax : +49 421 218 3601
www.comnets.uni-bremen.de/~mms~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jkhoo2989 wrote:
I found this in IEEE 802.11A Spec -
The start
of a valid OFDM transmission at a receive level
equal to or greater than the minimum 6 Mbit/s
sensitivity (-82 dBm) shall cause CCA to indicate
busy with a probability >90% within 4 µs.
If the preamble portion was missed, the receiver
shall hold the carrier sense (CS) signal busy
for any signal 20 dB above the minimum 6 Mbit/s
sensitivity (-62 dBm).
How do i intepreated
"6 Mbit/s sensitivity (-82 dBm)". Does 6 Mbit/s
means the data-rate? and what is this -82dBm.
How do i intepreted "any signal 20 dB above
the minimum 6 Mbit/s sensitivity (-62 dBm)"?
