A comparison of frequency-domain equalization techniques in aeronautical telemetry

Abstract

The frequency-domain equalization techniques described by Tan & Stüber, Pancaldi & Vitetta, Van Thillo et al, and Williams & Saquib are applied to SOQPSK-TG and its PAM approximation using two principal pulses. A simple representative channel from aeronautical telemetry was used in computer simulations. For weak multipath (measured by a shallow spectral null) the equalizers displayed nearly equal bit error rate performance. As the multipath intensity increased (deeper spectral null) the Pancaldi & Vitetta and Van Thillo equalizers achieved consistently superior performance, but operate at a loss of 8 dB at a bit error rate of 10−5.