[MLB-WIRELESS] to DSSS experts...

[John Dalton]

It depends on the receiver implementation.  IEEE 802.11x
doesn't specify the receiver structure (correlator,
RAKE, LMS, your own invention).  It only specifies the
signal going into the receiver.

As far as I know, most 802.11b systems use a correlator
and some of the newer ones use a RAKE.  Typically
no special processing is done to handle multipath delays
less than a chip, as the receiver is not able to resolve
delays less than a chip (due to the limited number
of filter taps and also the Nyquist limit of the ADC
sampling).

I guess it could be said that short multipath delays
result in multipath fading, so you are really asking
"How does the despreader handle multipath fading?".
Again, no special processing is done, but the system
relies on the spread bandwidth being wider than the
fade, or in the case of flat fading just stops working
until the fade goes away.

John

To unsubscribe: send mail to majordomo at wireless.org.au
with "unsubscribe melbwireless" in the body of the message