Underwater acoustic communication is the main technical means of wireless information transmission in the ocean.
Orthogonal Frequency Division Multiplexing (OFDM) technology has the advantages of high frequency band utilization
and strong resistance to multipath fading. It is widely used in underwater acoustic communication. However, OFDM
communication has the problem of high Peak to Average Power Ratio (PAPR), which will lead to signal distortion and
reduce communication efficiency. This paper proposes a PAPR suppression method for OFDM communication based on
random jitter of cyclic prefix length. It can effectively reduce the probability that the initial phase of each group of
subcarriers is the same or similar, and reduce the generation of peak to average power ratio from the source.
This paper reports a kind of OFDM underwater acoustic communication technology based on Sagnac fiber optic hydrophone. It adopts the fiber optic hydrophone technology based on Sagnac fiber ring composed of 3×3 fiber coupler. The sampling rate of the system is 48kHz, the fiber optic hydrophone can achieve up to 12.3kHz underwater acoustic detection bandwidth and -140dB (0dB re 1rad/ μPa) sound pressure sensitivity. According to the test results of the underwater acoustic communication experiment, the underwater acoustic communication rate is up to 24kbps, the bit error rate is at the magnitude of 10−2 , and the simulation communication rate is up to 100kbps. Sagnac fiber optic hydrophone shows excellent low-frequency suppression ability and simple structure, which are very suitable for underwater acoustic communication.
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