Abstract: A method for designing a time-domain non-stationary V2V MIMO communication channel emulator includes determining basic parameters for the V2V MIMO communication channel; generating a V2V 2D time-domain non-stationary communication channel environment, by using a MATLAB, that is, the numbers of the scatterers and the positions of the scatterers and the like; importing parameters generated in the previous step into a hardware simulation platform to calculate communication channel parameters for clusters, such as an angle distribution and a power distribution, writing a Verilog code for running, and eventually calculating to obtain a channel impulse response of the time-domain non-stationary V2V MIMO communication channel; and comparing with a statistical characteristic of a theoretical communication channel model, and designing an appropriate hardware diagram of a communication channel emulator.

Abstract: A method for estimating channel parameters of a reconfigurable intelligent surface based on a spherical wave assumption includes the following steps. In Step 1, a signal transmission model of a RIS-assisted near-field communication is constructed based on the spherical wave assumption; in Step 2, channel measurement data in different RIS transmission modes are obtained; in Step 3, a delay, an angle of arrival, an angle of departure, a Doppler shift and a polarization matrix of multipath in channels are estimated based on a space-alternating generalized expectation maximization algorithm, and angle parameters, distance parameters and coupling polarization matrices of the multipath at a RIS end are estimated based on a maximum likelihood principle; and in Step 4, the estimated parameters are updated and iterated subsequently. The method can estimate all important channel parameters in the RIS-assisted near-field communication scenario more accurately.

Abstract: An aurora borealis simulation device and an aurora generating method are provided, which relates to the technical field of light simulators and includes: a simulation device main body and an aurora simulation component. A projection window is provided on the simulation device main body. The aurora simulation component comprises: a light-emitting unit; a fixing frame fixedly mounted on an inner wall of the simulation device main body; a radiator arranged on the fixing frame and assembled corresponding to the light-emitting unit; a first light-transmitting component of which one part is provided on the fixing frame and the other part extends toward a side of the projection window and is located between the projection window and the light-emitting unit, and a second light-transmitting component fixedly mounted on the simulation device main body and located within the projection window.

Abstract: An aurora borealis simulation device and an aurora generating method are provided, which relates to the technical field of light simulators and includes: a simulation device main body and an aurora simulation component. A projection window is provided on the simulation device main body. The aurora simulation component comprises: a light-emitting unit; a fixing frame fixedly mounted on an inner wall of the simulation device main body; a radiator arranged on the fixing frame and assembled corresponding to the light-emitting unit; a first light-transmitting component of which one part is provided on the fixing frame and the other part extends toward a side of the projection window and is located between the projection window and the light-emitting unit, and a second light-transmitting component fixedly mounted on the simulation device main body and located within the projection window.