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• W2023594601 abstract "In this paper, Alamouti space-frequency block coding, applied over the carriers of an orthogonal frequency-division multiplexing (OFDM) system, is considered for obtaining transmit diversity in an underwater acoustic channel. This technique relies on the assumptions that there is sufficient spatial diversity between the channels of the two transmitters, and that each channel changes slowly over the carriers, thus satisfying the basic Alamouti coherence requirement and allowing simple data detection. We propose an adaptive channel estimation method based on Doppler prediction and time smoothing, whose decision-directed operation allows for reduction in the pilot overhead. System performance is demonstrated using real data transmitted in the 10-15-kHz acoustic band from a vehicle moving at 0.5-2 m/s and received over a shallow-water channel, using quadrature phase-shift keying (QPSK) and a varying number of carriers ranging from 64 to 1024. Results demonstrate an average mean squared error gain of about 2 dB as compared to the single-transmitter case and an order of magnitude decrease in the bit error rate when the number of carriers is chosen optimally." @default.
• W2023594601 created "2016-06-24" @default.
• W2023594601 creator A5054370349 @default.
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• W2023594601 date "2015-04-01" @default.
• W2023594601 modified "2023-10-09" @default.
• W2023594601 title "Space–Frequency Block Coding for Underwater Acoustic Communications" @default.
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• W2023594601 doi "https://doi.org/10.1109/joe.2014.2316558" @default.
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