4.6 Article

Fully Quadrature Subcarrier-Index Shift Keying for Efficient Underwater Acoustic Communications

Journal

IEEE ACCESS
Volume 9, Issue -, Pages 46975-46984

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3067878

Keywords

OFDM with index modulation (OFDM-IM); underwater acoustic communications; quadrature shift keying; subcarrier-shift keying

Funding

  1. Deanship of Scientific Research, King Khalid University, Abha, Saudi Arabia [GRP/66/42]

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The novel fully quadrature subcarrier-index shift keying orthogonal frequency division multiplexing (FQSISK-OFDM) modulation scheme proposed in this paper successfully distinguishes between active odd and even subcarriers, reducing power leakage and achieving higher spectral and energy efficiencies for underwater acoustic communications. Simulation results demonstrate the superiority of FQSISK over plain OFDM and OFDM index modulation techniques.
A novel fully quadrature subcarrier-index shift keying orthogonal frequency division multiplexing (FQSISK-OFDM) modulation scheme for underwater acoustic communications (UWAC) is proposed in this paper. In the FQSISK, the data is conveyed by active and non-active OEDM-subcarriers indices. Moreover, the active odd and even subcarriers are marked with separable predefined dummy variables (DV). Herein, the DV +/-delta (i.e., it can take any predefined value), and its quadrature +/- j delta are exploited to distinguish between active even and odd subcarriers. Hence, the possibility of power leakage from active to non-active subcarriers is reduced, which minimizes the effect of severe UWAC inter-carrier-interface (ICI). Moreover, the spectral efficiency of the FQSISK hardly depends on the subcarriers grouping size, which reduces the proposed FQSISK decoder complexity significantly. The simulation results demonstrate the proposed FQSISK superiority, as it achieves higher spectral and energy efficiencies than the plain OFDM and the recently introduced OFDM index modulation (OFDM-IM) techniques.

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