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Multi-path shadow compound fading channel simulation device and work method thereof

A technology of fading channel and simulating device, applied in the field of wireless information transmission

Inactive Publication Date: 2015-07-01
上海知白智能科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the complexity of wireless channels, it is impossible to build a single model covering all conditions

Method used

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  • Multi-path shadow compound fading channel simulation device and work method thereof
  • Multi-path shadow compound fading channel simulation device and work method thereof
  • Multi-path shadow compound fading channel simulation device and work method thereof

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Embodiment Construction

[0061] The multipath shadow compound fading channel realization block diagram of the present invention is as follows figure 1 As shown, the principle is as follows:

[0062] In the transmission process of wireless signals, radio frequency signals are usually used to ensure effective transmission. The channel simulation device of the present invention needs to mix it at the channel input end to obtain intermediate frequency signals and filter out images, and then obtain two channels after AD sampling and down-conversion. quadrature baseband signal Output signal after composite fading channel After it is up-converted and the analog signal is output through DA, finally the analog signal is mixed to output the radio frequency signal. This method also supports IF input and output signals without using a mixer block.

[0063] complex baseband signal After passing through the composite fading channel, we get recorded as

[0064] y ~ ...

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Abstract

The invention relates to a multi-path shadow compound fading channel simulation device and a work method thereof. First, a universal compound fading mathematical model is provided based on the comprehensive consideration of the compound influence of path losses, shadow fading and multi-path fading. Then, the multi-path fading, the shadow fading and channel noise in the model are decomposed into a Gaussian random process expression form and generated by an SoS (Second-Order Section) fixed-point model in a unified simulation way. The simulation method conforms to FPGA-based (Field Programmable Gate Array) fixed-point operation characteristics and is easy to realize. The simultaneous simulation of an uplink and a downlink is supported by a simulation system. Two input interfaces are available for selection, and radio frequency simulation signals or intermediate frequency simulation signals are input through the input interfaces. Parameters about communication scenes and the like are input by a user through a PC (Personal Computer), the feature parameters of the compound fading channel under the scenes are calculated by a DSP (Digital Signal Processor) in real time, and the feature parameters are utilized by the FPGA to carry out hardware simulation. Output simulation signals passing a wireless channel also comprise intermediate frequency signals and radio simulation signals. The multi-path shadow compound fading channel simulation device and the work method thereof are used in land-land mobile communication scenes, and can also be used in air-land (land-air) and air-air communication fading channel scenes.

Description

Technical field: [0001] The invention relates to a wireless channel simulation device and working method for multipath shadow complex fading, especially for a wireless fading channel simulation system and method in common environments, and belongs to the field of wireless information transmission. Background technique: [0002] In the past two decades, wireless communication technology has developed rapidly, and wireless communication has become an indispensable part of people's daily life. Different from wired communication, wireless communication must consider the influence of the wireless communication environment no matter in the design and development of the system or in the planning and deployment of the communication network. [0003] During the propagation process of the wireless signal, there is path loss due to the influence of terrain, landform and transmission distance. At the same time, the reflection, scattering and diffraction of radio waves will occur, so tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/391H04W16/18H04B17/309
Inventor 朱秋明周生奎黄攀戴秀超王成华陈小敏刘星麟
Owner 上海知白智能科技有限公司
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