Estimation and Compensation of Linear Amplitude Distortions

The estimation and the compensation of particular amplitude distortions, affecting the consumer-grade receivers in broadband satellite communications, are considered. We present a novel estimator, analytically derived by exploiting low-order polynomial approximations of the equivalent distortion filter, which is modeled as an exponential function of the frequency. In the bandwidth of practical interest, the proposed solution results to be unbiased and does not exhibit false locks. Since the ideal compensator requires a complex filtering, we also describe an alternative low-complexity compensation filter, almost ensuring the same performance as the ideal one. Some computer simulation results, showing the effectiveness of the proposed solutions, are finally reported.