Filter design for the conjugate OFDM-OQAM system

We present a filter design procedure for a novel multicarrier modulation scheme, the conjugate OFDM-OQAM, which only requires amplitude tailoring of the prototype filter frequency response, regardless of its phase. It achieves good interchannel interference (ICI) and intersymbol interference (ISI) rejection, while still maintaining maximum spectral efficiency and a good time-frequency localization of the transmission pulses. Loosening the phase constraint allows the use of an effective technique for matched filter design, developed by Samueli (1988). Through this technique we are able to design a system with higher performance than standard OFDM-OQAM systems with the same prototype filter length.