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Modulation signal constellation design method for high-speed train communication

A technology of modulating signals and design methods, applied in multi-carrier systems and other directions, can solve problems such as the inability to further improve system performance, and achieve the effects of increasing average information, reducing bit error rate, and excellent system performance

Inactive Publication Date: 2017-03-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the Doppler effect, many Doppler estimation correction algorithms have been proposed. However, due to estimation errors, the remaining Doppler residuals are still trapped in the received signal. At this time, the correction algorithm alone cannot further improve the system performance. performance

Method used

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  • Modulation signal constellation design method for high-speed train communication
  • Modulation signal constellation design method for high-speed train communication
  • Modulation signal constellation design method for high-speed train communication

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] This embodiment is oriented to the modulation signal constellation design method for high-speed train communication. The received signal in the mobile communication system has a frequency deviation after Doppler correction, and each signal constellation point has a signal diffusion radius of the Doppler residual frequency deviation, wherein, The undisturbed area interval between the signal diffusion radii of two adjacent signal constellation points is a guard interval between the signal constellation points, and the method includes adjusting the positions of the signal constellation points so that the signal constellation points The guard intervals between them are equal.

[0036] Specifically, the specific adjustment method of the signal constellation point includes:

[0037] S1 obtains the basic model of the received signal after Doppler correction, a common ...

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Abstract

The invention discloses a modulation signal constellation designing method for high-speed train communication. Each receipt signal in a mobile communication system has frequency deviation after Doppler correction, the signal diffusion radius of each signal constellation point is determined when the Doppler residual frequency error exists, and the area interval which is not disturbed and located between the signal diffusion radii of every two adjacent signal constellation points is the protection interval of the corresponding signal constellation points. The modulation signal constellation designing method is characterized by comprising the step that the position of each signal constellation point is adjusted, so that the protection intervals between the signal constellation points are equal.

Description

technical field [0001] The invention relates to the field of wireless communication in a high-speed mobile communication environment, in particular to a modulation signal constellation design method for high-speed train communication. Background technique [0002] With the rapid development of high-speed railway and the rapid growth of ground mobile communication technology, people's demand for high-speed railway mobile communication, especially the demand for high data rate, is increasing day by day. However, the current high-speed rail mobile communication system GSM-R can only support a bit rate of 200kbps, and it is mainly signaling-oriented. In addition, relying on the cellular coverage of terrestrial 2G / 3G communication supports single-user communication mode, which is often used in high-speed rail mobile scenarios. [0003] It often leads to the interruption of voice communication and the continuous retransmission of short data communication. These problems seriously...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38
Inventor 李涛樊平毅
Owner TSINGHUA UNIV