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A method for vehicle-to-ground communication in a high speed environment

A vehicle-to-ground communication and environmental technology, applied in the field of communication, to achieve good communication performance, ensure effectiveness and accuracy, and solve the effect of Doppler effect

Inactive Publication Date: 2018-12-18
GLORY WIRELESS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems caused by the Doppler effect in the high-speed mobile environment in the prior art, the present invention proposes a vehicle-ground communication method for high-speed environments

Method used

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  • A method for vehicle-to-ground communication in a high speed environment
  • A method for vehicle-to-ground communication in a high speed environment
  • A method for vehicle-to-ground communication in a high speed environment

Examples

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Embodiment Construction

[0021] In this example, for millimeter wave high-speed mobile scenarios, the following figure 1 The frame structure of the SC-FDE system is shown, where the frame structure consists of "frame→subframe→time slot". That is, the physical frame structure is composed of several subframes, and the frame is composed of multiple time slots.

[0022] A physical frame includes a synchronization sequence STF and several subframes. Such as figure 2 As shown, the first subframe has one more parameter information block than other service subframes, and the parameter information block is used to transmit fixed parameter information during the communication process. The rest of the subframe structure is composed of channel estimation sequence CEF and 10 business data blocks. The length of each data block is 512 symbols, wherein the data symbol length is 448 symbols, and a guard interval of 64 symbols is added between the symbol blocks. The guard interval GI here is the Gray sequence Ga64...

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Abstract

The invention relates to the field of communication technology, in particular to a vehicle-to-ground communication method for a high-speed environment. The invention adopts the symbol protection interval GI sequence to carry out phase calibration, cross-correlates the equalized GI sequence of the receiving end with the local GI sequence, calculates the magnitude of the phase deflection at the position of the maximum amplitude point, and then the data part of the data block carries out phase calibration on the phase deflection calculated according to the GI sequence. Compared to traditional SC-FDE communication system, that method of the invention can obviously shorten the length of the channel estimation sequence. The method can guarantee the validity and accuracy of channel estimation andimprove the spectral efficiency in fast time-varying channels. At the same time, the method can guarantee good communication performance in high symbol rate and high mobile speed.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a vehicle-ground communication method used in a high-speed environment. Background technique [0002] With the rapid development of wireless communication technology, signal transmission in high-speed mobile communication has become the focus of people's increasing attention. Especially in response to the requirements of passenger broadband wireless communication and vehicle-mounted wireless sensor network big data transmission in the high-speed rail environment, my country has carried out research on key technologies of related wireless communication and achieved major breakthroughs. The 4th generation (4G) mobile communication standard TD-LTE dominated by my country has begun large-scale commercial use, and the 5th generation mobile communication standard has also carried out a lot of research through the IMT-2020 (5G) promotion group. However, how to provide stable, rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04W4/40
CPCH04L25/0202H04L27/2656H04W4/40
Inventor 吕启福罗志刚
Owner GLORY WIRELESS CO LTD
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