V2I/V2V Internet-of-things system based on cognitive OFDM and method thereof

Abstract

The invention discloses a V2I / V2V Internet-of-things system based on cognitive OFDM, comprising on-board units and roadside units. The on-board units and the roadside units are configured to carry out wireless communication based on an ISM frequency band to transmit video, voice and text data and provide traffic safety information and traffic condition information for drivers. The invention further provides a mobile ad hoc network information transmission method comprising the following steps: an information collection module starts collecting video, voice, text and other information, and a control host module compresses, codes, packages and modulates the information and sends the modulated information to a sending queue; a sender notifies a receiver in a control channel that the data is about to be sent; the receiver performs spectrum sensing, and feeds a carrier frequency and a subcarrier group of good channel quality currently back to the sender through the control channel; the receiver receives a packet of information, and demodulates and checks the information to obtain check information; and the receiver records the number of times of consecutive packet loss, and decides whether to perform spectrum sensing according to the number of times of packet loss.

Description

technical field [0001] The present invention relates to the field of Internet of Vehicles, in particular to a V2V / V2I Internet of Vehicles system based on cognitive OFDM. Background technique [0002] The Internet of Things uses advanced communication and networking technologies to connect objects into a network and integrate them into the existing Internet, so that people can interact with wide-area and multi-dimensional information in the real world through the Internet of Things and realize human-machine interaction. The seamless integration of physical environment. [0003] Against the background of the rapid development of the Internet of Things, urban traffic congestion and sustainable development requirements, the Internet of Vehicles has evolved from the Vehicular Ad Hoc Network (VANET) to the era of IoV (Internet of Vehicles). Technologies such as WAVE (Wireless Access in Vehicular Environment) protocol based on IEEE802.11p and Drive-thru based on IEEE802.11b have ...

AI Technical Summary

Problems solved by technology

However, the switching speed of wifi is slow, which is not suitable for fast switching of vehicle network

The Chinese patent application number is: CN201410759270, the name is: a data transmission device based on OFDM, which discloses a data transmission device based on OFDM, which uses high-speed DSP and corresponding software programming to monitor the operation of dual hosts and dual channels. Detection and judgment, but OFDM technology is not used in the field of Internet of Vehicles, nor does it recognize the signal

The disadvantages of the existing technology mainly include: 1) The on-vehicle wifi network system based on the Internet of Vehicles framework uses wifi as the communication mode, and the switching delay is very long; The cellular network is difficult to load; 3) The 802.11p protocol does not perform dynamic spectrum sensing and switching, and cannot adapt well to the dynamically changing communication environment

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