Adaptive Method of Antenna Radiation Pattern Based on Doppler Channel Characteristics

Abstract

The invention relates to an antenna radiation directional pattern self-adaptive method based on Doppler channel characteristics. The antenna radiation directional pattern self-adaptive method comprises the following steps: S1, initially setting a radiation directional pattern of an antenna having two symmetrical main lobes, and detecting whether the antenna receives a signal sent by a user on a high-speed rail in real time; S2, obtaining an estimation value of the operation speed of the high-speed rail, an estimation value of a minimal distance between a rail and a base station and an estimation value of a time when the high-speed rail passes through the base station with the minimal distance based on the Doppler channel characteristics and a geometrical mathematical model; S3, reconstructing and predicting the movement track of the high-speed rail so as to obtain the position of the high-speed rail at any given time; S4, self-adaptively arranging the radiation directional pattern of the antenna, such that the radiation directional pattern has a main lobe for tracking and covering the high-speed rail in real time; and S5, turning to the step S1 when the high-speed rail at this time leaves, and waiting a next high-speed rail to pass through. Compared with the prior art, the antenna radiation direction tracks and covers the high-speed rail in real time; therefore, the QoS is increased; the power consumption is reduced; and the practicability is high.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an antenna radiation pattern self-adaptation method based on Doppler channel characteristics. Background technique [0002] It is very important to maintain a good quality of service (Quality of Service, QoS for short) for users of the high-speed rail wireless communication system. This is not only to meet the needs of users on high-speed rail, but also to ensure a high level of safety. Nowadays, many high-speed rail wireless communication applications rely on Global Position System (Global Position System, GPS for short) positioning, but there are few methods that do not rely on GPS positioning. Although GPS can generally provide location information of high-speed rail and base stations (BS for short), other positioning methods that do not rely on GPS are still required as a backup. [0003] Recently, in a communication system, a solution to achieve high coverage and good...

AI Technical Summary

Problems solved by technology

However, in many scenarios, GPS signals cannot be accurately received or decoded, and the typical environment is the high-speed rail scenario

Due to the high-speed mobility of the high-speed rail, the complexity of the environment along the line and the influence of weather conditions, GPS cannot effectively play its role in many cases

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