A Novel Implementation ofCarrier Interferometry OFDM inanUnderwater Acoustic Channel

Thispaperpresents a noveldesignofcarrier interferometry (CI)spreading codes byusing inverse fast Fourier transform (IFFT) instead oflinear transformation. Pulse shaping methodinfrequency domainisusedtogenerate different carrier interferometry orthogonal frequency division multiplexing (CI/OFDM) signals. Peak-to-average powerratio (PAPR)and BER performance havebeencompared between OFDM andour proposal. Simulation results showthatourproposal possess good PAPRandBER performance. Additionally, itcould simplify the CI/OFDMsystem implementation significantly. IndexTerms-Carrier Interferometry (CI), CI/OFDM,IFFT, Pulse Shaping