Milestone breakthrough in China's underwater communication technology: Successfully received signals 30 kilometers away, Huawei technology made a contribution

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News on August 24, according to the South China Morning Post report on the 23rd, Chinese scientists recently achieved a milestone breakthrough in an underwater communication test using the HPW data encoding method developed by Huawei, successfully receiving 30 kilometers of The signal sent outside exceeds NATO's current public disclosure of the longest underwater communication distance of 28 kilometers.

Scientists involved in the project said that the latest underwater data transmission technology has achieved remarkable results after being tested. It was learned that the water depth in the test area reached 3,000 meters. The scientists deployed a small hydrophone 1,000 meters below the sea surface and successfully received signals from ships 30 kilometers away, with a data transmission speed of 4,000 bits per second.

This result breaks the performance record of underwater acoustic communication equipment in public reports. Extremely low frequency (ELF) radio waves are able to penetrate bodies of water but are extremely inefficient, transmitting only a few characters per minute. Sound waves are highly efficient, but are susceptible to refraction from the sea surface and seafloor, ocean currents and other environmental interference, making it difficult to transmit large amounts of data over long distances.

The Chinese team used the Polarization Weight (HPW) encoding method. Underwater acoustic communication equipment using this encoding method does not require data segmentation and can modulate information onto a single carrier for transmission and reception, greatly reducing the equipment requirements. power consumption and complexity.

In the test, a team of scientists led by Professor Tong Feng from the School of Ocean and Earth Sciences of Xiamen University successfully achieved ultra-long-distance zero-error transmission of 30 kilometers in the frequency range from 4000Hz to 8000Hz. The

HPW method stems from a major breakthrough in the field of number theory and was jointly developed by Huawei Chinese, French and Canadian scientists. It transmits information with unprecedented efficiency and eliminates noise. HPW is a type of polar code. Polar code was invented by Turkish scientist Erdal Arikan in 2008. It is the first algorithm that can increase the efficiency of information transmission to the theoretical limit. Currently, polar codes are widely used in 5G communications and consumer electronics.

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