Abstract
OFDM/OQAM is a promising radio access technique for high data-rate fourth generation cellular systems, operating on time and frequency dispersive wireless channel. Contrary to the well established OFDM/QAM, it allows very well localized prototype waveforms to be used for critical unit-density time-frequency lattices, offering maximal spectrum efficiency. Starting from the set of orthonormality conditions verified by the frequency-time lattice shifted versions of the prototype waveform, we derive the general orthonormality criterion for OFDM/OQAM. We show that even and odd parity prototype waveforms are basically the unique waveforms for which the general orthonormality criterion simplifies to that of OFDM/QAM with frac12 time-frequency lattice density. Based on the simplified criterion, we propose and characterize a new orthonormalization procedure for the efficient design of very well localized prototype functions, starting from non-orthogonal mother waveforms. Finally, we show that odd parity orthonormalized mother functions lead inevitably to badly localized prototype waveforms and that only even parity prototype waveforms should be used in practice.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.