MMSE Receiver for Multicarrier CDMA Overlay in Ultra-Wide-Band Communications.

Multicarrier direct-sequence code-division multiple-access (MC-CDMA) overlay has been proposed to be used for ultra-wide-band (UWB) communications. Interference reduction and interference suppression are the key issues for sharing the spectrum in harmony between the established narrow-band systems and e overlaid UWB system. In this paper, investigation is carried out on the use of compromising measures incorporated to the MC-CDMA overlay to meet these goals, as well as on their impacts to e involving parties. At the transmitter, interference reduction to e established narrow-band systems is done by using notch filters. multipath Nakagami fading channel is assumed. At the receiver, e interference suppression from those narrow-band systems is filled by minimum mean square error (MMSE) detection technique. Numerical results show that precombining MMSE with selective-maximal combining provides the UWB system with much better performance than the receiver made up of notch filter in cascade with code correlator. [ABSTRACT FROM AUTHOR]