MIMO onboard communication system and performance evaluation method thereof

Abstract

The invention relates to a MIMO onboard communication system performance evaluation method. A multi-hop scattering model is equivalent to a single-point scattering model through geometric transformation based on a traditional ellipse model through the system, and the performance of a MIMO multi-antenna system is evaluated through the spatial fading correlation, the channel capacity and the Doppler parameter; a receiving end of the MIMO onboard communication system is that at least one group of array elements is a circular array of an omnidirectional antenna; and the system performance is evaluated according to three information parameters of the spatial fading correlation function as shown in description, the MIMO multipath channel capacity as shown in description and the Doppler spectrum distribution function as shown in description. The MIMO onboard communication system disclosed by the invention has the advantages that three performance evaluation parameters of the spatial fading correlation coefficient, the MIMO multipath channel capacity and the Doppler parameter are introduced to analyze the advantage of a transmitting end directional antenna array relative to the omnidirectional antenna array; the system performance of the directional antenna array is superior to the system performance of omnidirectional antenna array by discovering from the relation between the system performance and the Poda signal distribution and the directional antenna beam direction.

Description

Technical field [0001] The invention relates to the field of terminal MIMO multi-antenna communication detection, in particular to a MIMO vehicle-mounted communication system and a performance evaluation method thereof. Background technique [0002] In recent years, the rapid development of MIMO wireless communication technology has become a major research object of 5G mobile communication technology. In order to establish a more efficient vehicular communication system, the design of the MIMO fading channel model matching the real communication scene and the accurate recognition of its spatial characteristics are particularly important . For the mobile communication environment, researchers have proposed a series of scatter channel performance evaluation methods based on geometric statistics focusing on the 2D plane, such as the classic scatterer spatial distribution circle model and ellipse model. Qu derives the Doppler spectrum probability distribution of a three-dimensional ...

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Problems solved by technology

In the study of channel modeling, the main defect of the classical elliptic model is that only single-hop scattering is considered for the propagation path of the wave arrival signal, but the multi-hop scattering propagation path is not considered; according to the measurements of Tokyo and Yokohama downtown by Ghoraishi et al According to the data, the RF tracking receiver detected a large number of scatterer signals, and it can be judged that for a relatively narrow dense urban street environment, it is not practical to only consider single-point scattering, because the effective street width is not enough to match the maximum scattering area of ​​the model

For such street micro-cell scenarios, the implementation requirements of the single-point scattering assumption are quite strict, and when the multi-scattering propagation path of the wave-arrival signal is considered, the previous scattering channel performance evaluation method will no longer be applicable

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