Peak-to-Average Power Ratio in WFMT systems

This paper discuses the Peak to Average Power Ratio (PAR) for signal of novel Wavelet based Filtered Multi-Tone (WFMT) modulation. The Wavelet based Filtered Multi-Tone (WFMT) modulation was developed as an alternative line code for xDSL system and represents future extending of OFDM/DMT technologies. Because of the multicarrier nature of WFMT modulation, it is suitable for carrying high-speed data over a wide frequency band. The major drawback of the multicarrier system is the large PAR of the transmit signal, which causes a straightforward implementation costly and inefficient. In this paper, we examine the PAR of WFMT line code. A simple expression for PAR is developed, both for circular and for square constellation diagram of QAM modulator. The results illustrate significant little Peak-to-Average Power Ratio of the WFMT transmit signal versus PAR in OFDM system.