Impairment compensation sequence for communication

A receiver for receiving data over a communications channel susceptible to one or more potential impairments each periodic in an integer number of symbols transmitted across a communications channel, the receiver comprising:

• a demodulator for demodulating a modulated impairment compensation sequence, the impairment compensation sequence including:
• N phases, wherein N is selected such that each potential impairment is periodic therein;
• and
• a sequence of amplitudes transmitted from terminal equipment, the sequence organized to place a positive and a negative instance of each symbol from a predetermined set of symbols in each phase to allow detection of the potential impairments in each of the N phases, wherein the N phases are grouped into a set of characteristic groups according to the effects of periodic impairments present in the N phases;
• and
• a decoder for decoding the sequence of amplitudes.

A computer program product comprising a computer readable medium having computer program logic recorded thereon, the computer program logic comprising:

• instructions executable on at least one processor to at least partially implement a communications device;
• and
• said instructions including a communication subset thereof executable to adapt the communications device to establish communication across a channel susceptible to one or more potential impairments each periodic in an integer number of symbols transmitted across the channel, the communications device for receiving an impairment compensation sequence, the impairment compensation sequence including:
• N phases, wherein N is selected such that each potential impairment is periodic therein;
• and
• a sequence of amplitudes transmitted from terminal equipment, the sequence organized to place a positive and a negative instance of each symbol from a predetermined set of symbols in each phase to allow detection of the potential impairments in each of the N phases, wherein the N phases are grouped into a set of characteristic groups according to the effects of periodic impairments present in the N phases.