Abstract
Modulation schemes tolerant to large delay spreads and high Doppler shifts are needed for reliable underwater acoustic communication (UAC). Due to the sensitivity of orthogonal frequency division multiplexing (OFDM) to Doppler shifts, two alternatives, namely, orthogonal time frequency space (OTFS) and orthogonal chirp division multiplexing (OCDM) are studied to evaluate their performance in UAC chanenls. The OTFS and OCDM schemes are seen to achieve significantly lower bit error rates (BERs) compared to OFDM in the ideal scenario, i.e., when the channel information at the receiver is perfect. Even with estimated channel knowledge at receiver, time-variations of the channel between the estimation phases, and reduced guard intervals, OTFS and OCDM outperformed OFDM. A linear channel interpolation of the estimated channel gains is proposed to account for the time-variations of the channel and is seen to improve the BERs of OTFS and OCDM schemes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
