[Tinyos-help] bidirectional gain

[Philip Levis]

On May 29, 2009, at 5:53 AM, Rémi Villé wrote:

> Hi,
>
> In the topology file of TOSSIM we can see that we can choose a gain  
> for a link from a node A to a node B and a different one for the  
> link from B to A, so it may imply that, in real world, we have  
> different gain from a mote A to a mote B and from B to A.
>
> I would like to know if it's indeed the case in reality, if having  
> two very different gain between two motes is a rarity, if we can say  
> the gain difference between two mote directed link is often in a  
> range of one value.
> If someone knows this value it would be perfect.

Please read the work at USC on this.

It is common in reality, due to hardware variations. While it is very  
uncommon (but not impossible) for the actual RF attenuation to be  
different in the two directions, the two transceivers can have  
different frequency sensitivity.

Phil