  In this letter, we analyze power and rate adaptation in a point-to-point link
with Rayleigh fading and impulsive interference. We model the impulsive
interference as a Bernoulli-Gaussian random process. Adaptation is used to
maximize the average spectral efficiency by changing power and rate of the
transmission subject to an average power and instantaneous probability of error
constraints. Without impulsive interference, it is well known that
water-filling is optimal for block fading. We provide two simple schemes that
show that the conventional water-filling algorithm is not optimal in an
impulsive interference channel.
