Authors A. A. Vaganova, N. N. Kisel, A. I. Panychev
Month, Year 03, 2018 @en
Index UDC 621.396
Abstract Signal propagation conditions in specific scenarios are described with the channel matrix of a MIMO system, which is usually estimated experimentally using pilot signals. However, the possibility of a preliminary estimation of the channel matrix taking into account the environment and the location of the transmitting and receiving antennas would be useful to reduce the amount of service information in the transmitted signal. Thus, when radio waves propagate indoors and in dense urban environment, the phenomenon of multipath propagation arises, because there are a lot of stationary and mobile objects in the coverage area of the communication system. Therefore, when analyzing signal propagation in wireless communication systems, it is necessary to take into account both the deterministic characteristics of a particular propagation scenario (for example, topography, position of buildings, floor plans, etc.) and the possibility of accidental changes in propagation conditions (movement of people, vehicles, etc.). This is possible, for example, by introducing a statistical component into the model of a wireless communication system. In this paper the distribution of the field intensity, which corresponds to the transmission coefficient of each channel of the indoor MIMO system, is simulated taking into account the random position of an obstacle in the signal path. Statistical analysis of the results of channel matrix calculation is performed. Random movement of the obstacle in the first Fresnel zones of direct and reflected rays made it possible to simulate a different state of the transmission channels. Realizations of emitted field intensity distribution for each element of the system in the horizontal section of the room at the height of the transmitter location are obtained based on the three-dimensional ray tracing algorithm. The field amplitude at the locations of all the receivers is calculated for 100 random positions of the obstacle. Statistical processing of the channel matrix calculation results is performed. The obtained results show that the interference of signals propagating along different paths has a more significant influence on the signal level at a particular point of the room than the fact that this point of reception is located in/out of the transmitter’s line of sight. The standard deviations of the channel matrix elements have the same order as the mean values or one order less. This indicates a significant spread of their values which are commensurable with the mean values.

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Keywords Statistical evaluation; channel matrix; transmission coefficient; MIMO; multipath propagation.
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