Over the last few years, various enabling technologies and techniques for future Ka-band satellite communication systems were developed. In this paper, we present objectives and results of several projects on direct conversion transceivers and power amplifier linearization, targeting the cost reduction of terminals and satellite subsystems with the use of advanced, enabling techniques. Performances of these techniques are presented based on either hardware prototype tests or computer simulation. It is shown that low complexity digital signal processing can be used to compensate traditional limitations of direct transceivers as well as to linearize power amplifiers. Although the paper concentrates on terminal technologies, the application and benefit of these techniques to satellite subsystems are readily seen.
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