generated by the pn sequence generator and leaves pulses unchanged responsive to logic zeros u201c 0s u201d generated by the pn sequence generator 110 in an exemplary embodiment non inverted pulses have a value of one u201c 1 u201d and inverted pulses have a value of negative one u201c u2212 1 u201d pulse shaping circuitry 112 coupled to the inverter 104 shapes the pulses for transmission via the antenna 114 in an exemplary embodiment the pulse shaping circuitry 112 is wideband pulse shaping circuitry such as uwb pulse shaping circuitry suitable pulse shaping circuitry for use with the present invention will be understood by those of skill in the art from the description herein with reference to fig2 a the exemplary receiver 200 is now described signals transmitted by the transmitter 100 fig1 are received via an antenna 202 in the receiver 200 a matched filter 204 coupled to the antenna 202 discriminates the pulses within the received signal to produce a pulse stream in an exemplary embodiment the pulse stream is pulse modulated using a modulation scheme such as a ppm and or a pam scheme the matched filter 204 may be a wideband matched filter such as uwb matched filter configured to discriminate uwb pulses suitable.