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Channel estimation and diversity method based on train speed and position in train-ground communication

A channel estimation, vehicle-ground communication technology, applied in the directions of space transmit diversity, diversity/multi-antenna systems, baseband system components, etc. The effect of reduced complexity, low complexity and high efficiency

Inactive Publication Date: 2011-04-13
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The algorithm process is long, the complexity is high, and the amount of calculation is large, so it cannot solve the time selectivity problem of the channel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. channel estimation and diversity method based on train speed and position in a vehicle-ground communication, its steps are:

[0037] A. The vehicle station and the base station store the channel state experience information database, which contains the channel state experience information corresponding to the speed information and position information of the train running.

[0038] The initial information of the channel state experience information base in this example is obtained through multiple field measurements. The channel state experience information stored in the channel state experience information base includes the time domain response, frequency domain response, spatial correlation, and angular correlation of the channel. , and noise information.

[0039] B. The vehicle-mounted station obtains the current speed information and position information of the train, and transmits the speed information and position information to the base station at the same tim...

Embodiment 2

[0046] 1. channel estimation and diversity method based on train speed and position in a vehicle-ground communication, its steps are:

[0047] A. The vehicle station and the base station store the channel state experience information database, which contains the channel state experience information corresponding to the speed information and position information of the train running.

[0048] The initial information of the channel state experience information base in this example is obtained through multiple field measurements. The channel state experience information stored in the channel state experience information base includes the time domain response, frequency domain response, spatial correlation, and angular correlation of the channel. , and noise information.

[0049] B. The vehicle-mounted station obtains the current speed information and position information of the train, and transmits the speed information and position information to the base station at the same tim...

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Abstract

The invention discloses a channel estimation and diversity method based on train speed and position in train-ground communication, comprising the main steps: according to the obtained speed and position information of a train at current, inquiring channel state experience information corresponding to the position and the speed of the current train in a prestored channel state experience database;taking the information as a primary channel estimation result; verifying by a reference signal; if the verification result is not in a set error range, taking the verification result as a final channel estimation result; and if the verification result has big error, taking the channel estimation result of the previous frame as the final channel estimation result. The method has advantages of low complexity, high efficiency and accurate and reliable channel estimation result.

Description

technical field [0001] The invention belongs to the technical field of vehicle-ground communication between a train and a ground base station in a high-speed mobile environment. Background technique [0002] With the construction and development of high-speed railways, railway communication technologies are constantly being updated, and train-ground communication systems in high-speed mobile environments have attracted more and more attention. The communication needs of passengers on high-speed trains and the demand for efficient transmission of train control (train operation control) information have surged, posing severe challenges to existing communication systems. [0003] The high-speed mobile environment will bring a series of problems such as Doppler frequency shift, rapid channel change, and frequent handover to the communication network. In the high-speed railway scenario, the large Doppler frequency shift and the rapid change of the channel pose severe challenges ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B7/08
Inventor 方旭明陆玲辉杨崇哲
Owner SOUTHWEST JIAOTONG UNIV
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