Car networking uplink synchronization system and method based on OFDMA access technology

An access technology, a technology of the Internet of Vehicles, which is applied in the field of the Internet of Vehicles uplink synchronization system, can solve the problems of low system throughput, low reliability, and high system delay, achieve high system throughput, high reliability, and overcome system throughput. low rate effect

CN103269363AActive Publication Date: 2013-08-28四川电子科技大学教育发展基金会
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-08-28

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Abstract

The invention discloses a car networking uplink synchronization system and method based on the OFDMA access technology. The car networking uplink synchronization system comprises a transmitter and a receiver, wherein the transmitter brings convenience for a plurality of OBUs to transmit transmission chance request frames on corresponding component channels through the fact that a car networking common transmission channel is divided into M component channels, and the receiver is used for enabling OFDMA signals input by successfully-connected users in a car networking to be sequentially processed by frequency shift filter extraction and FFT conversion to separate input data of each user and achieves the situation that the OBUs simultaneously access RSUs. The transmitter is connected with the receiver in a wireless mode, and M is equal to 1 or 2 or 4. According to the car networking uplink synchronization system and method based on the OFDMA access technology, the defects that the system throughput rate is low, system delay is high, and reliability is low when a large number of OBUs exist in the prior art can be overcome, and the advantages that the system throughput rate is high, the system delay is low, and the reliability is high under the condition are achieved.
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Description

technical field

[0001] The present invention relates to the technical field of intelligent transportation systems, in particular to a vehicle networking uplink synchronization system and method based on OFDMA access technology. Background technique

[0002] The concept of Intelligent Transport System (ITS) originated in the 1960s, when the United States launched a series of research to solve the increasingly tense traffic problems. Afterwards, Europe, Japan, etc. also carried out the research of this kind of technology one after another. China's ITS development is relatively late, probably starting after the 1990s, so there is a big gap compared with the United States, Europe, Japan and other regions. The so-called intelligent transportation system is the effective comprehensive application of computer technology, communication technology and control technology to the ground traffic management system, so as to establish a large-scale, all-round real-time, accurate and effic...

Examples

Embodiment Construction

[0047] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0048] System embodiment

[0049] According to an embodiment of the present invention, a car networking uplink synchronization system based on an Orthogonal Frequency Division Multiple Access (OFDMA for short) access technology is provided. Such as Figure 1-Figure 6 As shown, the uplink synchronization system of the Internet of Vehicles based on OFDMA access technology in this embodiment includes a method for dividing the common transmission channel of the Internet of Vehicles into M sub-channels, so that the on-board unit OBU can send transmission opportunity request frames on corresponding sub-channels The transmitter used to separate the OFDMA signal input by...