A linear compensation system of a digital TV relay or other apparatus preferably
includes a transmitting unit configured to modulate a data to an intermediate frequency
(IF) signal, up convert the IF signal to an RF signal, and amplify the RF signal
to a predetermined level using a high power amplifier (HPA). The system also includes
a linear compensation unit to preferably directly vary a step size of an adaptive
equalizer according to whether a signal-to-noise ratio (SNR) or an error vector
magnitude (EVM) for an output signal of the HPA satisfies an advanced television
systems committee (ATSC) or other standard. The linear compensation unit is thus
configured to output an improved linear compensation coefficient to a modulator
of the transmitting unit.
