Research On Propagation Performance Of 28 GHz Millimeter Wave MIMO In Indoor Wireless Channels

Multiple input multiple output technology(MIMO)can make full use of space resources and multiple antenna to improve system capacity without increasing the spectrum resources or antenna transmitting power,therefore MIMO technology has become one of the key technologies in wireless communication field.And with continuous development in recent years,MIMO technology will be used in more and more wireless communication systems.28 GHz band local multipoint distribution service is a broadband wireless point to multipoint access technology,having many advantages,such as low cost,high communication bandwidth,flexible networking and so on.Therefore,many domestic and foreign organizations and companies pay high concern to the 28 GHz band and MIMO technology.Based on indoor 28 GHz MIMO channel measurements,the paper analyzes channel parameters distribution,MIMO channel capacity and spatial correlation.The main work is as follows:Firstly,the 28 GHz millimeter wave characteristics and MIMO technology are introduced.Second,the LOS and the NLOS propagation parameters in the 28GHz millimeter are analyzed,like K factor,RMS delay spread,transmission path loss and so on.Third,angle spread of angle of departure and arrival,angle channel parameter of sage extraction are studied based on 28 GHz MIMO(4×4)channel measurement data.Fourth,the capacity of indoor channel and the influence of spatial correlation on capacity are analyzed under LOS and NLOS scenarios.In this paper,the propagation characteristics of indoor 28 GHz MIMO propagation channel are analyzed comprehensively.And the results can provide referent value for millimeter modeling and wireless communication systems in the future.