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The paper presents a practical Doppler estimator to be used in underwater acoustic (UWA) channels. The estimation is performed using OFDM pilot signals. The OFDM pilot signals are passed through a Doppler channel that adds the above effects to the signal. The receiver then performs Doppler estimation on the signal. The estimator finds an estimate for the Doppler scaling factor (also called the mach...
This paper discusses trial results, design features and applications for an underwater acoustic Orthogonal Frequency Division Multiplexing (OFDM) modulator and demodulator operating in the 525 kHz to 825 kHz band with a throughput of 380 kbps over ranges extending to 100 m. The standard timing unit T is 16384 μs. Because the acoustic signaling is in the commercial AM radio band reception of the OFDM...
This paper investigates the performance of coded orthogonal frequency division multiplexing (OFDM) in underwater optical wireless communications (UWOWC). Low density parity check (LDPC) and turbo code are used in conjunction with a 16 quadrature amplitude modulation (16-QAM) scheme. The channel impulse response (CIR) is simulated via the Monte Carlo modelling of light (MCML) approach using the Henyey-Greenstein...
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