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Method for implementing simulator with fading channel

A technology of fading channel and implementation method, applied in baseband system components, shaping network in transmitter/receiver, transmission monitoring, etc.

Inactive Publication Date: 2008-10-08
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] At present, most of the research on fading channels is based on software simulation, or an emulator implemented by combining DSP and FPGA, and only Gaussian white noise channel can be added.

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  • Method for implementing simulator with fading channel
  • Method for implementing simulator with fading channel
  • Method for implementing simulator with fading channel

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Embodiment Construction

[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0048] see figure 1 , 2. First, using the statistical model established by Clarke, using the shaping filter method, using the Doppler power spectrum, directly simulate the Rayleigh channel from the frequency domain, and then obtain the time domain channel through time domain transformation. The details are as follows: the E field is represented by the in-phase component and the quadrature component as

[0049] E. Z =T c (t)cos(2πf c t)-T s (t)sin(2πf c t)

[0050] In the formula The shaping filter method passes the white Gaussian random process through the shaping filter with Doppler power spectrum, so as to realize the simulation of the Clarke model.

[0051] 1) First, use the shaping filter method to simulate the Clarke model of the Rayleigh flat fading channel:

[0052] a. Determine the representative power spectrum according to the required si...

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Abstract

The present invention provides a method for realizing a simulator with fading channel. A Clarke model of Rayleigh flat fading channel is simulated with a shaping filter method to obtain a complex random variable of a recognizable path channel with a power spectral density. A plurality of recognizable path channels are adopted. The frequency selective fading channel can be obtained by combining the linear weighting a1 and linear delay tau1 of each independent subchannel. The corresponding fading channel is simulated with Matlab and CCS Simulation according to the given Cost207 channel surrounding and channel model. The simulated fading channel is realized with DSP6000, and the output result with different precision is obtained by altering the input parameter. The output result of DSP6000 is converted to an analog periodic signal through a D / A conversion. The signal is observed with an oscillograph. Finally the simulation result with fading channel can be obtained by contrasting the waveform outputted by the oscillograph with the theoretical waveform. The method of the invention has excellent simulation reference value, additionally a software simulation is firstly executed before the realization with the DSP6000, therefore the result obtained by the invention is consistenet with the theoretical result.

Description

technical field [0001] The invention belongs to a fading channel simulation method in the technical field of wireless communication, and in particular relates to a method for realizing a fading channel emulator. Background technique [0002] In the past two decades, wireless communication technology, as a science and technology with extremely rapid development, has continuously produced new systems and new technologies in this field. The fading channel emulator can virtually realize various interferences that may exist in wireless channels, thus providing a very important means for theoretically and practically exploring the advantages and disadvantages of these systems and technologies. Wireless mobile channels are complex and changeable, and there are many mathematical models available for reference. [0003] Due to the multipath effect in the transmission process of the wireless mobile channel, reflection, scattering, diffraction and other phenomena will occur when the r...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B1/707H04L25/03H04B17/391
Inventor 任品毅汪瑞
Owner XI AN JIAOTONG UNIV