Abstract
Aiming at the problems of underwater acoustic communication such as narrowband, low speed and multipath effect, this paper studies the high-speed communication technology of electromagnetic wave in short distance at sea. The channel model of seawater electromagnetic wave is given, and the performance of different modulation modes in this channel is analyzed. A meth-od of seawater short-range high-speed electromagnetic wave communication based on OFDM is proposed. In order to reduce the BER of the system, a method of allocating different modulation modes to subcarriers in seawater channel is introduced, which combines frequency domain equalization. This method has low complexity, improves the utilization of frequency band, and improves the reliability. It can realize high-speed and reliable communication in short distance in seawater.
Highlights
Most underwater communications use acoustic waves as physical transmission media [1]
Aiming at the problems of underwater acoustic communication such as narrowband, low speed and multipath effect, this paper studies the high-speed communication technology of electromagnetic wave in short distance at sea
A method of seawater short-range high-speed electromagnetic wave communication based on OFDM is proposed
Summary
Most underwater communications use acoustic waves as physical transmission media [1]. Electromagnetic wave has higher bandwidth, faster speed and less impact on natural environment in short distance underwater. The underwater communication of electromagnetic wave is mainly limited by the drastic attenuation of water channel, which is a special constant parameter channel. The attenuation of electromagnetic wave is related to frequency and propagation distance It belongs to time-invariant frequency selective fading channel in a certain period of time. For this channel, OFDM technology can be used to reduce the transmission rate on each subcarrier, and each subchannel is approximately flat. A subcarrier allocation modulation scheme for seawater electromagnetic channel is studied and designed, which can realize short-distance high-speed electromagnetic wave communication in seawater
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