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Self-adaptive array antenna system capable of compensating Doppler effect

A Doppler effect, array antenna technology, applied in the field of adaptive array antenna system, to achieve the effect of low hardware complexity

Inactive Publication Date: 2013-01-09
CHINA RAILWAY SIGNAL & COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current patented frequency offset compensation algorithms are all completed at the base station, and the existing communication system needs to be upgraded or redesigned

Method used

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  • Self-adaptive array antenna system capable of compensating Doppler effect
  • Self-adaptive array antenna system capable of compensating Doppler effect
  • Self-adaptive array antenna system capable of compensating Doppler effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1 Doppler frequency shift compensation and beam steering based on time-modulated array antenna

[0069] In this embodiment, the speed v of the mobile station is 100 m / s (360 Km / h), and the angle between the direction of the speed and the direct connection line between the mobile station and the base station is 45°. The array adopts a uniformly distributed linear array, the number of array elements is N=16, and the spacing between array elements is half a wavelength. The transmitted intermediate frequency signal is a single-frequency signal with a frequency of 100 MHz, and the frequency of the local oscillator used by the up-converter is 1.9 GHz. Using a digital frequency synthesizer to set the control frequency f of a high-speed radio frequency switch p = 99,999,505 Hz.

[0070] Figure 4a It is a timing diagram of each switch opening in one control cycle of the high-speed RF switch, Figure 4b is the beam pattern of the whole antenna under this turn-on t...

Embodiment 2

[0072] Embodiment 2 Quadrature Amplitude Modulation Communication System Based on Time Modulation Array Antenna

[0073] In this embodiment, the speed v of the mobile station is 100 m / s (360 Km / h), and the angle between the direction of the speed and the direct connection line between the mobile station and the base station is 20°. The array adopts a uniformly distributed linear array, the number of array elements is N=16, and the spacing between array elements is half a wavelength. The signal to be transmitted is sampled in the baseband 16QAM modulation mode, its bandwidth is 20MHz, the intermediate frequency carrier frequency is 100MHz, and the local oscillator frequency used for up-conversion is 1.9GHz. According to the Doppler frequency shift compensation algorithm, the control frequency of the RF switch is calculated as f p =99,999,760Hz, and use it as the frequency control word to control the digital frequency synthesizer to generate the sine wave signal of this frequen...

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Abstract

The invention relates to a self-adaptive array antenna system capable of compensating a Doppler effect. The self-adaptive array antenna system comprises a plurality of antenna arrays, a high-speed radio frequency switch and a control circuit, wherein the antenna arrays are used for receiving wireless signals sent by mobile stations and inputting the wireless signals to a radio-frequency band-pass filter or is used for receiving signals sent by the radio-frequency band-pass filter and radiating the signals to a base station; the high-speed radio frequency switch is used for determining the offset of a carrier frequency of a signal before being received or transmitted after the signal is received or transmitted; and the control circuit is used for periodically controlling the control frequency of the high-speed radio frequency switch, realizing beam pointing of the antenna arrays and adjusting the control cycle of the radio frequency switch to compensate the Doppler frequency shift. The self-adaptive array antenna system realizes the compensation on the Doppler frequency shift and control over wave beams of the antenna arrays and suppresses multipath signals and is particularly suitable for communication of high-speed mobile stations, such as high-speed rails and airplanes.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, in particular to an adaptive array antenna system capable of compensating Doppler effect. Background technique [0002] With the large-scale construction of high-speed railways, the demand for communication methods and systems that can meet the requirements of high-speed communication is becoming more and more urgent. During the communication process, the signal received by the high-speed mobile terminal will produce Doppler frequency shift, and its impact on communication is mainly reflected in: 1. The shift of the carrier frequency; 2. Doppler spread due to multipath . In the next generation of mobile communication systems (LTE, Wimax, etc.), in order to improve the utilization of communication channels, Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used, and OFDM technology is more sensitive to frequency offset changes. Therefore, compensating the Doppler...

Claims

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Application Information

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IPC IPC(8): H04B7/08
Inventor 贺冲陈维明李维蒙张锦辉张晓钧熊发田连文昭金荣洪耿军平梁仙灵
Owner CHINA RAILWAY SIGNAL & COMM
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