Underwater optical wireless real-time high-definition video transmission device based on FPGA

Abstract

The invention discloses an underwater light wireless real-time high-definition video transmission device based on an FPGA (Field Programmable Gate Array), which comprises a transmitting device and a receiving device, and is characterized in that the transmitting device sequentially comprises a camera, the FPGA of a transmitting end, a digital-to-analog converter, a bias device and an LED (Light Emitting Diode); and the receiving device sequentially comprises a focusing lens, a photoelectric detector, a power amplifier, an attenuator, an analog-to-digital converter, an FPGA (Field Programmable Gate Array) of a receiving end and a display. The device adopts optical wireless communication and high-order digital signal modulation technologies to improve the distance and quality of existing underwater video transmission, so that the system transmission efficiency is higher, the maintenance cost is lower, and high-speed transmission of underwater videos can be realized without using a network camera or Ethernet transmission.

Description

technical field [0001] The invention belongs to the technical field of underwater wireless communication, in particular to an FPGA-based underwater optical wireless real-time high-definition video transmission device in underwater wireless communication. Background technique [0002] With the deepening of human activities such as marine resource exploration, oceanographic research, and marine environment monitoring, the data transmitted between underwater devices has increased significantly. The rapid and real-time transmission of these data has put forward higher requirements for the communication capabilities of current underwater devices. Although the traditional underwater acoustic communication has a long transmission distance, the transmission delay is large, the rate is low, and the multipath interference is serious, which makes it difficult to meet the bandwidth requirements of real-time high-definition video image transmission. The strong conductivity of seawater li...

AI Technical Summary

Problems solved by technology

The Chinese invention patent application CN109347556A published on February 15, 2019 after retrieval discloses an underwater communication system based on visible light. The system uses STC single-chip microcomputers to complete signal processing, which cannot meet the requirements of high-speed and high-bandwidth video transmission systems. , In addition, the existing underwater video transmission systems mostly use single-carrier low-order modulation formats, such as OOK modulation, the system transmission rate and spectrum efficiency are low, and the transmission video resolution is 320*240 pixels. For details, see references: A. Al- Halafi, H. Makine Oubei, Boon S. Ooi, and B. Shihada, "Real-Time Video Transmission OverDifferent Underwater Wireless Optical Channels Using a Directly Modulated 520nm Laser Diode," J. OPT. COMMUN. NETW 9(10), 826 -832 (2017)

In addition, many existing underwater video transmissions need to be carried out by using network cameras or Ethernet transmission. For details, see references: J. LI, B. YANG, D. YE, L. WANG, K. FU, J. PIAO, and Y. WANG, "A Real-Time, Full-Duplex System for Underwater Wireless Optical Communication: Hardware Structure and OpticalLink Model," IEEE Access vol. 4, 109372-109387 (2020), the system transmission cost is high, and the receiving requires an Ethernet card on the end and is not easy to maintain

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