[ns] Fading and interference effect in NS2 802.11b

[Matthias Wellens]

 Hi Jee,

>Could anybody give me some clue that whether NS2 integrates/considers
>channel fading and interference effect in the 802.11b model?
>
ns2 does not consider fading. There is an extension available from CMU
that can be ported to the actual version of ns2:
http://www.ece.cmu.edu/wireless/

Additionally, only one interfering packet is considered. If the original
received power is high enough, the frame will not be discarded, if it's
too low, the frame will be discarded. The ratio of received to
interfering power is compared to CPThresh and thus it's decided, whether
the frame is discarded or not.

Check the mailinglist-archives for some more details.

>Another question on 802.11 is: when there are bit errors in a received
>frame, what will the receiving node do? Just discards the frame and does not
>send the ACK? This is not a NS2 question, but I hope somebody can provide me
>some information. Thanks a lot in advance!
>
A node following 802.11 or 802.11b will do this, yes. In 802.11a or
802.11g FEC is adopted so that the errors might be corrected.

Regards,
Matthias

-- 
Matthias Wellens
Research Student
Department of Wireless Networks
Aachen University
Germany

Email:   mwe at mobnets.rwth-aachen.de
Address: Kackertstrasse 9
          D-52072 Aachen
          Germany