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A Modeling Method for Non-stationary Fading Channel

A fading channel and generation method technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of sudden change of channel state parameters, discontinuity of signal phase, inconsistent characteristics of continuous channel state, etc., to ensure phase and randomness. and the effect of independence

Active Publication Date: 2018-02-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

At present, most fading channel generation methods only focus on modeling and simulation of stationary channels. If such methods are directly applied to non-stationary channels, it will lead to problems such as channel state parameter mutation and signal phase discontinuity, which is different from the actual channel state. Continuity feature does not match

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  • A Modeling Method for Non-stationary Fading Channel
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  • A Modeling Method for Non-stationary Fading Channel

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Embodiment Construction

[0047] The specific implementation process of the present invention will be further described below in conjunction with the accompanying drawings and examples. The following examples are used to explain the present invention, but do not limit the scope of application of the present invention.

[0048] The wireless received signal is usually the superposition of multiple clusters of resolvable path signals, and each cluster signal is composed of indistinguishable scattering branches. The theoretical model of channel impulse response at time t can be expressed as

[0049]

[0050] Among them, i represents the sequence number of the distinguishable cluster; n represents the sequence number of the indistinguishable branch in the cluster; a i,n (t) and τ i,n (t) respectively represent the path propagation loss (including slowly changing shadow fading) and time delay of each scattering branch; f d,i Indicates the maximum Doppler frequency of each cluster; θ i,n and φ i,n Deno...

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Abstract

The invention provides a modeling generation method for a non-stable fading channel. The method is suitable for non-stable fading channel modeling and simulation generation in a mobile propagation scene, can be used for accurately reproducing a statistical characteristic of the non-stable fading channel, and can be applied to the field of testing and verification of mobile communication system performance in a time varying scene. According to the method, a channel state is supposed to change continuously and slowly, approximately considered to keep constant within a certain time interval, and modeled as a sum of channel complex gains of a line-of-sight part and a non-line-of-sight part. Channel non-line-of-sight fading of each cluster is obtained by overlapping of a plurality of paths of complex exponential functions, and discrete Doppler frequency parameters of different paths of complex exponentials change linearly in a serrate form. Moreover, a frequency parameter real-time updating calculation method is provided, so that value continuity and the continuity of an output channel fading phase are ensured.

Description

Technical field: [0001] The invention relates to a modeling generation method of a wireless fading channel, belongs to the field of wireless communication, and is particularly aimed at a modeling generation method of a time-varying non-stationary fading channel in a dynamic scene. Background technique: [0002] As an electromagnetic wave transmission medium, the wireless channel directly affects the transmission quality and performance of the wireless communication system; the modeling and generation of the wireless channel refers to the establishment of a channel model that is consistent with the actual propagation environment, and it is accurate and effective through computer software simulation or hardware simulation. restore its channel characteristics. It is of great significance to analyze the performance of the wireless communication system, shorten the system development cycle and so on. [0003] Wireless channel fading includes large-scale fading and small-scale fa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/391
CPCH04B17/391
Inventor 刘星麟朱秋明李浩赵智全陈小敏江凯丽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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