[Avrora] Radio model in Avrora

[Simon Han]

Hi,

	I plan to use Avrora for large scale sensor network simulation and  
am wonder the radio model used in Avrora.  Is there any documentation  
related to this topic?  I am particular interested in

1. wireless channel model: is wireless noise modeled?

2. packet collision model: what happen what two nodes try to send at  
the same time?  Will two bytes get or-ed together?

3. adjustable parameters: what kind of parameters related to radio  
that I can adjust in Avrora?

Thank you for any help,
Simon