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Performance Evaluation of \(\pi /4\)-DQPSK OFDM over Underwater Acoustic Channels

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Abstract

This paper investigates the performance of orthogonal frequency division multiplexing (OFDM) with \(\pi /4\)-differential quadrature phase shift keying (\(\pi /4\)-DQPSK) modulation, over underwater acoustic (UWA) channels. The orthogonal multicarrier scheme with non-coherent detection technique results in spectrally efficient, reliable and simple receiver design. \(\pi /4\)-QPSK has less envelop fluctuation and performs better in multipath UWA channels. It is shown that with a pair of hydrophones for reception and maximum-ratio combining (MRC) technique, one can achieve considerably low bit-error-rate (BER) at practical signal-to-noise ratio (SNR) value. Further, the BER expression for such a scheme is obtained by using the probability density function and is shown to consist of a series with fast converge rate. The series solution approximation provides a reasonable match between the simulation and the analytical results with and without the MRC diversity technique.

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Authors and Affiliations

  1. Electrical Engineering Department, Indian Institute of Technology Patna, Patna, Bihar, 801103, India

    Prashant Kumar & Preetam Kumar

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  1. Prashant Kumar
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  2. Preetam Kumar
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Correspondence to Prashant Kumar.

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Kumar, P., Kumar, P. Performance Evaluation of \(\pi /4\)-DQPSK OFDM over Underwater Acoustic Channels. Wireless Pers Commun 91, 1137–1152 (2016). https://doi.org/10.1007/s11277-016-3517-0

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  • DOI: https://doi.org/10.1007/s11277-016-3517-0

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