Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Analysis and modeling of spatial characteristics in urban microscenario of heterogeneous network | Zhang et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 187 EURASIP Journal on . http content 20ii i i87 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Analysis and modeling of spatial characteristics in urban microscenario of heterogeneous network 1 1 1 1 2 2 1 Jianhua Zhang Nan Sheng Fenghua Zhang Lei Tian Guangyi Liu Weihui Dong Ping Zhang and Chia-Chin Chong3 Abstract Heterogeneous network HetNet is a typical deployment scenario for the IMT-Advanced system whereby the macro enhanced node B eNB provides the wide coverage while the lower power nodes such as micro pico femto and relay nodes extend the coverage capacity for coverage hole or hotspot. This literature addresses the spatial propagation modeling for urban micro UMi scenario of HetNet. Due to users distributed in canyon streets the multipath with high power is not always coming from the line-of-sight LoS direction in UMi scenario. Moreover considering the impact of the directional antenna pattern the current IMT-Advanced UMi channel model may lead to inaccurate interference modeling. To verify this multiple-input multiple-output MIMO field channel measurement is conducted in downtown Beijing for typical UMi. Based on the measurement data analysis the multipath s angular offset from the LoS direction is clearly observed. In order to capture such spatial characteristic into the existing IMT-Advanced UMi channel model the angular offset models are proposed for both LoS and non-LoS NLoS cases. Finally the interference and capacity simulation prove that it is necessary to capture the angle offset model into the MIMO channel model in UMi scenario. Keywords IMT-Advanced multiple-input multiple-output MIMO channel model interference HetNet 1. Introduction With the expansion of the mobile data market the mobile operators have more and more pressure to expand the cellular capacity by cell splitting or carrier aggregation 1 . In .
