Performance of pulse shape modulation of UWB signals using composite hermite pulses

The existing literature shows that the transmitting and receiving antennas behave as a differentiators in the case of pulse based UWB radiations. This paper studies the effects of such antennas on the spectrally efficient composite Hermite pulses (CHPs) in pulse shape modulation (PSM) based UWB communications. The study shows that the CHPs are not much altered in terms of the power spectra and autocorrelation characteristics though the received pulses lose orthogonality. A simplified suboptimal structure for non-matched correlation detection is proposed. The received pulse is correlated with the locally generated Hermite functions and the resulting vector is projected to the columns of the coefficients matrix of the CHPs. This results in the correlations of the received pulse with all the CHPs. The CHP having the maximum absolute correlation with the received pulse is declared as the transmitted pulse.