Peak-to-Average Power Ratio in WFMT Systems

This paper discuses the peak to average power ratio (PAR) for the signal of a 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 extension 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 the straightforward implementation to be 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 a QAM modulator. The results illustrate significant little peak-to-average power ratio of the WFMT transmit signal versus PAR in OFDM system