Abstract

In wideband satellite transmission, the communication quality deteriorates due to nonlinear and linear distortion caused by the analogue characteristics of the transmitters and receivers. In order to overcome this problem, we propose an adaptive equalizer utilizing a memory polynomial, which compensates both the nonlinear distortion caused by amplifiers and the linear distortion in the BPFs (Band Pass Filters). The simulation and experimental evaluation results show an improvement in receiver performance for 32/64APSK (Amplitude and Phase Shift Keying) transmission in an environment with both nonlinear and linear distortion. Moreover, we discuss the reduction of the number of nonlinear filter coefficients for further performance improvement and the effect of changing the roll-off factor in a satellite channel.

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