Design of BFDM/OQAM systems based on biorthogonal modulated filter banks

Cyrille SICLET and Pierre SIOHAN France Télécom R&D (DMR); 4, rue du Clos Courtel; BP59; 35512 Cesson Sévigné; France Tel: +(33)299 12 38 35; Fax: +(33)299 12 40 98; E-mail: [email protected] Abstract— A new system of multicarrier modulation is described which takes advantage of the biorthogonality property to generalize the OFDM/OQAM technique into a Biorthogonal Frequency Division Multiplex scheme named BFDM/OQAM. A discrete-time analysis of this scheme leads to a discrete model of modulated transmultiplexer. Using a polyphase decomposition of this transmultiplexer, and assuming a distortion-free channel, we determine the mathematical conditions on the prototype filter allowing an exact cancellation of intersymbol and interchannel interference. Then, computationally efficient realizations of the modulators and demodulators are given. Lastly, some design examples are provided illustrating respective advantages of BFDM/OQAM and OFDM/OQAM.