OFDM VS wavelet-OFDM and Circular Wavelet-OFDM in high speed communication over power lines

This paper presents results from simulations of classic non-prefixed Wavelet-OFDM and its circular version called Circular Wavelet-OFDM using a cyclic prefix. Both modulators have been compared with standard OFDM multicarrier techniques in the high speed power line communication environment. Circular Wavelet-OFDM, as a hybrid modulation scheme lying between Wavelet-OFDM and OFDM, has all advantageous of non-prefixed Wavelet-OFDM, additionally solving problem of equalization in the same way as in prefix-based OFDM. The main purpose of this article is focused on investigation of robustness of the mentioned above modulation schemes to colored noise, narrowband interference and, additionally, to impulsive disturbances. Statistically reliable calculation of BER performance is done by means of statistical modeling of three types of power line channels having different quality and by using statistical models of disturbances.