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Multipath and Doppler effect channel simulator and simulation method in tunnel environment

A technology of Doppler effect and tunnel environment, applied in the field of tunnel environment multipath and Doppler effect channel emulator, can solve the time dispersion, channel emulator cannot truly simulate radio transmission environment, and wireless communication system cannot communicate normally and other problems to avoid delay and improve real-time performance.

Inactive Publication Date: 2013-02-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. Time dispersion (echo) caused by multipath propagation delay
The disadvantage of this method is that the baseband digital processing process is limited by the processing speed of the computer, and the channel frequency band that can be processed can only reach 70MHz, and the entire calculation process will generate a microsecond delay, which makes the wireless communication system unable to communicate normally. The instrument cannot truly simulate the real radio transmission environment

Method used

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  • Multipath and Doppler effect channel simulator and simulation method in tunnel environment
  • Multipath and Doppler effect channel simulator and simulation method in tunnel environment
  • Multipath and Doppler effect channel simulator and simulation method in tunnel environment

Examples

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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, this tunnel environment multipath and Doppler effect simulator includes: digital-to-analog conversion circuit (2), low-pass filter circuit (3), adding circuit (4), voltage-controlled oscillator (5, 6), mixer (7, 9), low-pass filter (8), high-pass filter (10).

[0046] The above-mentioned digital-to-analog conversion circuit (2), model Art Control PCI8103, is used to convert the multipath, channel and Doppler parameters output by the multipath and Doppler models, and convert them from digital signals to analog signals. Its structure is A printed circuit board has a PCI slot and a 25-pin parallel interface. The PCI slot is used to connect the circuit board and the computer motherboard to receive instructions from the computer. It can be connected to the terminal board with a 25-pin parallel cable. The terminal board exports the output signal to 25 separate wire interfaces, which can be connected to other circuits with wires. In this system, th...

Embodiment 2

[0056] The tunnel environment multipath and Doppler effect simulation method uses the above-mentioned simulator for simulation, and the specific steps are as follows:

[0057] (1), output multipath, channel, and Doppler parameters according to the data model of multipath and Doppler effect: read the Doppler parameters, channel parameters and multipath parameters of the multipath channel from the computer (1), Output to the digital-to-analog conversion circuit through the PCI interface, the Doppler parameter is Gaussian white noise, the channel parameter and multipath parameter are DC level, and there is a slight voltage difference between the two;

[0058] (2), convert the digital level of multipath, channel, and Doppler data into analog level: receive multipath, channel, and Doppler parameters from the PCI interface of the computer (1), and pass the digital-to-analog conversion circuit (2) ) calculation, convert from digital signal to analog signal, and output from three outp...

Embodiment 3

[0067] Such as figure 2 As shown, the tunnel environment multipath and Doppler effect simulation method uses the above-mentioned emulator to simulate, uses the method of radio frequency circuit to process the wireless signal, and simulates the method of the multipath environment in the tunnel. The radio frequency processing process is as follows:

[0068] The multipath effect simulation is realized by multiplying the band-limited white noise with the original signal. The Doppler effect simulation is realized by down-converting the original signal and then up-converting it. If the original signal is a narrow-band signal with a center frequency of fc, another center Band-limited white noise at frequency LO, such as figure 2 As shown in (a); after the two are multiplied, the spectrum of the signal is broadened, and the frequency is down-converted to fc-LO, such as figure 2 As shown in (b); another sinusoidal signal with a frequency of LO+Δf is multiplied by the down-conv...

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Abstract

The invention discloses a multipath and Doppler effect channel simulator and a simulation method in a tunnel environment. The multipath and Doppler effect channel simulator comprises a digital-to-analog conversion circuit, a low-pass filter circuit, a summing circuit, a voltage-controlled oscillator, a frequency mixer, a low-pass filter and a high-pass filter. The simulation method comprises the following steps of: firstly, outputting multipath, channel and Doppler parameters according to a multipath and Doppler effect data model; converting digital level of the multipath, channel and Doppler data into analog level; and converting voltage into oscillating signals through the low-pass filtration, additive operation and the voltage-controlled oscillator, and carrying out frequency mixing, frequency mixing, low-pass filtration, frequency mixing and high-pass filtration on the oscillating signals to filter low-frequency signals generating by frequency mixing to finally obtain signals passing through a multipath channel. According to the tunnel environment multipath and Doppler effect channel simulator and the simulation method, time delay caused by processing in a digital circuit is avoided and the processing speed is increased.

Description

technical field [0001] The invention relates to a tunnel environment multipath and Doppler effect channel emulator and a method, which constructs a multipath effect and Doppler effect environment for simulating wireless signal transmission in a tunnel, and can be used for standardized testing of wireless system performance. Background technique [0002] In recent years, the number of wireless communication devices has increased. Wireless communication has been widely used in various industries and gradually applied to urban rail transit. However, multipath effects and Doppler effects will adversely affect the quality of wireless communication. And in the narrow tunnel space, the impact is even more severe. The multipath effect is mainly manifested as the small-scale fading effect. Its main performance is: [0003] 1. Rapid changes in signal strength over short distances and short durations of propagation. [0004] 2. On different multipath signals, there is random frequen...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B17/391
Inventor 金丹峰郑国莘叶娇孙星陆秦峰丁青锋
Owner SHANGHAI UNIV
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