The present invention provides a method and system for increasing reliability
of data packet transmission against impulsive noise in powerline communication
systems. The method modulates copies of a data packet on two different frequencies,
and transmits the modulated data packets along the powerline. One copy is transmitted
shifted in time by at least one bit from the other copy. Thus, when an impulsive
noise occurs along the powerline, the bits destroyed in the modulated first copy
are different than the bits destroyed in the second copy. In this manner, the remaining
bits in the first and second copies can be compared and used to reconstruct the
data packet. The reliability of data packet transmission against impulsive noise
is increased.