Patent ID: 8553749
Filing Date: 2013-10-08
Classification: H04L

Abstract:
1. A method of communicating on a subsea transmission line a set of carrier signals of different frequencies ranging from a lowest frequency to a highest frequency, the method comprising: at a first location, encoding the amplitude of each of said carrier signals above the lowest frequency with a data value, the amplitude of each encoded carrier signal above the lowest frequency being set for transmission in accordance with a ratio relative to the amplitude of a lower frequency carrier signal; at a second location, receiving said encoded carrier signals from said subsea transmission line encoded in accordance with said encoding step; and decoding each said received encoded carrier signal by scaling the amplitude of that received carrier signal to compensate for the ratio used to set the transmission amplitude of that carrier signal and to recover said data value thereby compensating for the frequency-dependent effect of the subsea transmission line on the amplitudes of the carrier signals.