  We consider an experimental setup of three USRPs that implement a wiretap
channel, two USRPs are the legitimate players Alice and Bob, while the third
USRP is the eavesdropper, whose position we vary to evaluate information
leakage. The experimented channels are close to slow fading channels, and coset
coding of lattice constellations is used for transmission, allowing to
introduce controlled randomness at the transmitter. Simulation and measurement
results show to which extent coset coding can provide confidentiality, as a
function of Eve's position, and the amount of randomness used.
