A Multi-Carrier Downlink Transmitter for Leo Satellite.

This paper discusses the performance of the Satellite Downlink Transmitter that uses a Wavelet based Filtered Multi-Tone (WFMT) modulation. The novel WFMT modulation is proposed to improve the characteristics of the OFDM multicarrier systems. In addition, it can also be used successfully in satellite communications. In this paper, we discuss the advantages of WFMT modulation such as low sensitivity to narrowband RF interference and lower Peak-to-Average Power Ratio (PAR) in comparison with OFDM. It is shown that modern GaAs Solid-State Power Amplifiers are well suitable for transmission of multicarrier signals. An effect of non-linear distortion on power added efficiency (PAE) of the RF Power Amplifier is discussed. The effect of clipping of the WFMT signal on the error performance is described. It is shown that the error correction block-codes can significantly improve PAR characteristics of the communication system. The Power Efficiency of WFMT Satellite Transmitter is significantly higher than in case of OFDM. [ABSTRACT FROM AUTHOR]