Spectral characteristics of OWSS signal

A recently reported signaling system called orthogonal wavelet spread spectrum (OWSS) is aimed at high speed WLANs. This letter discusses the generation and spectral properties of its basis pulses and the spectral characteristics of the transmit signal. If all virtual channels are active, the theoretical baseband spectrum of the OWSS systems is shown to be perfectly flat. Further, the simulated passband spectrum is found to be relatively flat and 30-40% more compact than that of the familiar 802.11a OFDM, due largely to the avoidance of the prefix, elimination of channel coding and a sharp rolloff.