What is an experiment ?

Here are all the steps an experiment follows:

for each transaction:
   for each selected_frequency:
       for each selected_nodes:
            One node transmit and the others listen

In other words, we iterate through a given list of nodes and at each iteration, one node transmit while the other listen. The transmitting node sends a given number of packets, spaced by a given time interval. Each receiving node sends an out-of-band notification each time it receives a packet. This scheme is then repeated for each given frequency. When all frequencies are covered, the transaction is over and the transaction counter (transctr) is incremented. The experiment is done when the transaction counter reaches a given limit.