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Cognitive vehicle-mounted method and system with frequency offset estimation and compensation functions

A vehicle communication system and frequency offset estimation technology, which is applied in the modulation carrier system, transmission system, wireless communication, etc., can solve the problems of frequency offset influence on communication quality and achieve the effect of improving accuracy

Active Publication Date: 2017-10-20
GUILIN UNIV OF ELECTRONIC TECH
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AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the communication quality of the cognitive vehicle communication method is greatly affected by the frequency offset, and provides a cognitive vehicle communication method and system with functions of frequency offset estimation and compensation

Method used

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  • Cognitive vehicle-mounted method and system with frequency offset estimation and compensation functions
  • Cognitive vehicle-mounted method and system with frequency offset estimation and compensation functions
  • Cognitive vehicle-mounted method and system with frequency offset estimation and compensation functions

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Embodiment Construction

[0029] A cognitive vehicle communication method with frequency offset estimation and compensation functions, such as figure 1 shown, including the following steps:

[0030] Step 1. The on-vehicle cognitive user who initiates the communication sends a communication request to the roadside unit;

[0031] Step 2. The roadside unit perceives the spectrum usage of the DSRC frequency band; if the DSRC frequency band is free, the roadside unit informs the vehicular cognitive user who initiates the communication of the result, and the vehicular cognitive user who initiates the communication directly uses the DSRC frequency band for communication; otherwise, Then the roadside unit broadcasts to all nearby vehicle-mounted cognitive users;

[0032] Step 3. All vehicle-mounted cognitive users who receive the broadcast of the roadside unit turn on the cognitive function, perform spectrum sensing in the DVB-T frequency band, and send the sensing results to the roadside unit;

[0033] Step...

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Abstract

The invention discloses a cognitive vehicle-mounted method and system with frequency offset estimation and compensation functions. The system comprises more than one vehicle-mounted cognitive user and a roadside unit arranged on the roadside; each vehicle-mounted cognitive user comprises a cognitive center processor, a cognitive communication machine, a base station communication machine, a base station center processor, a control center, a radio frequency front end, a baseband processing module, a frequency offset correction module and a vehicle-mounted unit. According to the cognitive vehicle-mounted method and system, the cognitive communication and the frequency offset estimation technology are combined and are applied to the vehicle-mounted communication, frequency offset estimation and compensation can be performed on a received signal when the vehicle-mounted cognitive user performs cognitive communication, and thus the communication efficiency is effectively improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a cognitive vehicle communication method and system with frequency offset estimation and compensation functions. Background technique [0002] At present, with the continuous advancement of science and technology, the function of the car is not limited to the means of transportation, but has concentrated entertainment, office, safety, comfort and other functions, which has increased the requirements for information transmission in the car. With the continuous increase of in-vehicle users, the existing communication frequency band can no longer meet the demand. In this case, the cognitive in-vehicle communication method emerges as the times require. The cognitive in-vehicle communication method mainly utilizes the DVB-T licensed frequency band with a large number of spectrum holes, and allocates the frequency band to the in-vehicle users who need to communicate by i...

Claims

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Application Information

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IPC IPC(8): H04B1/3822H04L27/00H04W72/04
CPCH04B1/3822H04L27/0014H04L2027/0026H04W72/0453
Inventor 肖海林张玉冰金晓晴沈正源马得森
Owner GUILIN UNIV OF ELECTRONIC TECH
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