A Stochastic Multilink Mimo Channel Modeling Method Based on Cooperative Elliptic Scattering
A channel modeling and scattering random technology, applied in wireless communication, transmission monitoring, electrical components, etc.
Active Publication Date: 2018-07-06
浙江乾行信息技术股份有限公司 +2
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However, applying massive MIMO-NOMA technology directly to high-speed rail scenarios will face severe challenges: such as figure 1 As shown, the signal coverage is carried out in a typical high-speed rail high-speed pipeline method, that is, the wireless coverage method of the central control station CCS+remote antenna unit RAU, in which the two RAUs belong to the same CCS, transmit the same signal at the same frequency, and the distance is about 1.5km , the length of the overlapping coverage area is about 0.5km. When the speed is 360km / h, the high-speed rail passes through the overlapping coverage area of two RAUs every 5s. At this time, the signals of the two RAUs will be received, and the Doppler frequency shift of the signals is opposite. , and the signal power is similar to
It is found from a large number of existing Chinese and foreign literature surveys that in such fast and frequent overlapping cells, channel modeling and channel estimation when adjacent RAUs communicate cooperatively is a "blind spot" problem that has not been studied
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[0049] Hereinafter, embodiments of the present invention are described, examples of which are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0050] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two The internal communication of each element may be directly connected or indirectly connected through an intermediary. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.
[0051] The modeling proc...
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The invention provides a collaborative elliptical scattering based random multi-channel MIMO channel modeling method for a high-speed rail broadband communication system, and aims at solving the problem of large signal transmission loss due to direct communication between a high-speed moving terminal and a roadside base station BS in the vehicle-ground communication composed of a high-speed rail moving carriage terminal MCT and a railway distributed remote antenna unit RAU. The method is on the basis of geometric random distribution theory; the attenuation correlation of a time domain and a space domain of a wireless channel is searched; a geometric distribution model is built for a high-speed rail typical scene U-shaped groove according to the geometric random distribution theory; the variation rule of a scattering body is analyzed; the mathematics closed expressions of the sighting distance LOS distribution, angle expansion, doppler spreading and other parameters are derived; a channel impact response CIR closed-form solution is provided. The method is specifically used for searching the channel model of the high-speed rail mobile scene, and provides firm theoretical basis for the high-quality ultrahigh-speed rail mobile communication.
Description
technical field [0001] The invention relates to a high-speed rail mobile communication channel modeling method, in particular to a high-speed rail broadband wireless communication system based on cooperative elliptic scattering random multi-link MIMO channel modeling method. Background technique [0002] With the rapid development of high-speed railways, railway communication technology must also take "digitalization", "wireless mobility" and "broadband integrated services" as its development goals. However, the GSM-R (GSM for Railway) system currently used by China Railway Communications is mainly based on the second-generation global mobile communication system GSM, which can only provide voice services and low-speed services, and cannot meet the development needs of future railway communications. The current public mobile communication system cannot meet the needs of users on the train either in terms of coverage or coverage quality of the railway. When the speed of high...
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IPC IPC(8): H04W24/06H04B17/391
CPCH04W24/06
Inventor 马永刚
Owner 浙江乾行信息技术股份有限公司