Millimeter-wave Channel Measurement And Characteristic Parameter Extraction

Recently,millimeter-wave bands have drawn much attention for consideration of the demands for designing a new generation of communication standards targeting at the mobile cellular wireless communication system,indoor short-range wireless communication system and communication based train control system.However,academia is still short of a thorough and deep understanding of the unique propagation features and intrinsic channel characteristics exhibited by different millimeter-wave bands in different geographical environments till now.Nevertheless,the depiction of wireless channels and the extraction of typical channel parameters are often required prerequisites for the design and optimization of wireless communication systems.Given that background,a programmable hardware measuring platform targeted at the wireless millimeter-wave channel is successfully designed based on the customized mechanical turntable and the dedicated millimeter-wave circuit measuring instruments.Afterwards,a direct time-domain correlation technique founded upon the Golay complementary sequences is utilized to accomplish the channel sounding experiments under the outdoor street canyon scenario,the mimetic metro tunnel scenario,the indoor corridor scenario and the conference room scenario.As for the outdoor street canyon scenario,the effects of vegetation cover on the long-distance outdoor channel are deeply analyzed.With regard to the indoor corridor,the conference room and the mimetic metro tunnel,the similarities and differences between the co-polarization channel and the cross-polarization channel are closely compared.For each specific channel combination,the classic ABG path loss model as well as the CI model is separately chosen to extract the large scale fading parameters including the path loss exponent and the shading factor.Besides,the delay-domain characteristics of the multipath channels are quantitized by calculating the main-path delays,average delays and RMS delay spreads.Finally,a modified K-means clustering algorithm is adopted for fulfilling the automatic clustering operations of multipath components.By measuring and analyzing the large-scale and small-scale fading characteristics of the millimeter-wave wireless channels in the afore-mentioned scenarios,this thesis provides data support to the research of the next generation of millimeter-wave mobile communication technologies.