Damped frequency division multiplexing: A super-resolution multicarrier scheme

Abstract

Although OFDM has efficient spectrum usage, it still has about 25% of symbol time lost in the insertion of cyclic prefixes (CP) overhead between consecutive symbols for regarding Inter Symbol Interference (ISI). The proposed DFDM introduces spectral efficient multicarrier modulation scheme through getting rid of CP which represents loss in power and bandwidth, while accounting for ISI resulting from multi-path time dispersion. By employment of exponentially damped waveform, it is possible to have symbols with highly attenuated end (damped tail). Under time dispersion channel, the damped tail will cause minimal interference effect on the next symbol. DFDM can be incorporated as OFDM alternative for increasing data rate for local area communication (i.e., under high SNR).