full-duplex 802.11?

[Luke Schapel]

Have to put my $0.2c in here as I have been thinking of the same thing. 
  I have modded two Netgear MA401's for external antennae, if they are 
at opposites ends of the PCI slots (cradles that is) crosstalk should 
not be a problem. Won't work with one antenna though, so I want to use 
two modded Ex-Galaxy antennae, one mounted horizontally and the other 
vertically. This should also minimise crosstalk. So now I am at the 
stage of figuring out how I can get my FreeBSD Wireless/Router/Firewall 
to use one card as transmit only and the other as receive only.

Before I get people saying _22 Meg_ cards, my reason is to circumvent 
the CSMA/CA issue. Collision Avoidance, which is the real killer in a 
high traffic environment _may_ not be such an issue in a full-duplex 
rig. Anyway, its all good fun :)

Cheers

Luke

Bruce Janson wrote:
> Now that sub-frequency selectable wireless devices are common, has anyone
> tried to set up full-duplex point-to-point links?  I would imagine that
> this could be done using two wireless cards at each end (i.e. four cards
> in total).  At each end, both cards would be attached to the same antenna
> (via some sort of "splitter/combiner" Y-shaped junction).  Each card would
> be tuned to a separate sub-frequency (and of course, that sub-frequency would
> match that of the corresponding card at the remote end).  Then traffic in
> one direction would be sent through one network interface (sub-frequency)
> and that in the other direction confined to the other channel.
> 
> Some minor software cleverness would be required to keep the traffic
> flows separate but I am interested to hear if anyone has tried this with
> current 802.11 wireless cards and if so, what effects it had.  (We can all
> _guess_ what the results might be, but I am looking for the results of
> actual experiments.)
> 
> Cheers,
> bruce.
> 
>