Wireless Networking: ?Power efficiency? 
I?m looking for some solution to power efficiency in wireless
networking by simulation or mathematical ??

There is two ways to look at power efficiency. One is RF power output
of a piece of equipment. All manufacturers have a rating but you would
need their engineering technical specs for that information. The
second power rating is for AC wall power (120 volt outlet) which is an
input to a piece of equipment. this rating is given in most owners
manuals forf that equipment. The rule of thumb for power efficiency
for a transformer is ?power in = power out? and then calculate the
lose. Too make it simple if you equipment uses 1 watt of AC power and
you equipment is putting out .6 watts RF power then the efficiency
would be calculated as follows: .6 / 1 = .60 or 60%. The equipment
would be considered to have an efficiency of 60%. So you need to know
two things. One the power rating, in Watts, of your equipment and two,
you need to know the RF power output of the equipment, usually between
.2 to 1 watt of RF output power. Then put it into your formula, (Watts
out divided by Watts in) then convert your decimal point to a
parentage. If you need more practical information on wireless
networking you can go to www.rcetc.com for assistance.

I'm not look for the company I'm looking for the solution

I think you have to viset this web sit:
www.cs.nmt.edu/~cs553
to finl the soulution.

Thank you.