Dear All,

If a stronger frame (P1) arrive during the reception of a weaker frame
(P2) by a certain threshold (dB), a MAC (802.11) in NS2 will decide it
as a collision.

However in  hardware implementation for e.g in Prism chipset, P1 can
still be captured if it arrives within P2's preamble time (Preamble
Capture) and in Atheros chipset, P1 can be captured even if it arrives
after P2's preamble time (Frame Body Capture) [1].

Settings in [2],
MAC = IEEE 802.11p
Preamble Capture Threshold = 5dB
Frame Body Capture Threshold  = 10dB

Settings in [3],
MAC = IEEE 802.11p
Preamble Capture Threshold = 4dB
Frame Body Capture Threshold = 10dB

Settings in [4],
MAC = IEEE 802.11a (5.9GHz)
Preamble Capture Threshold = 4dB
Frame Body Capture Threshold = 10dB

These capture thresholds very much dependent on the datarate, chipset
manufacturer's parameter setting etc. It is not defined by the
standard.

Anyone aware the optimal/chipset manufacturer setting for IEEE 802.11b
(e.g 11Mbps) for Preamble and Frame Body Capture Threshold ?

Would appreciate if you could point me to some papers or web URL's for
my further reading. My search have not been fruitful thus far.

rgds
Saravanan K

Reference:
[1] Jiho Ryu, Jeongkeun Lee, Sung-Ju Lee, and Taekyoung Kwon,
"Revamping the IEEE 802.11a PHY simulation models",  in Proceedings of
the 11th international symposium on Modeling, analysis and simulation
of wireless and mobile systems (MSWiM '08), pp 28-36, New York, USA
[2] Hannes Hartenstein, Kenneth Laberteaux, "VANET: Vehicular
Applications and Inter-Networking Technologies", Wiley,
[3] Moritz Killat* and Hannes Hartenstein, "An Empirical Model for
Probability of Packet Reception in Vehicular Ad Hoc Networks", EURASIP
Journal on Wireless Communications and Networking, 2009
[4] Byungjin Cho, "A Simulation study on Interference in CSMA/CA
Ad-Hoc Networks using Point Process", Masters Thesis, Aaltoo
University, 2010

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