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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Optimum Antenna Downtilt Angles for Macrocellular WCDMA Network | EURASIP Journal on Wireless Communications and Networking 2005 5 816-827 2005 Jarno Niemela et al. Optimum Antenna Downtilt Angles for Macrocellular WCDMA Network Jarno Niemela Institute of Communications Engineering Tampere University of Technology P.O. BOX 553 33101 Tampere Finland Email jarno.niemela@tut.fi Tero Isotalo Institute of Communications Engineering Tampere University of Technology P.O. BOX 553 33101 Tampere Finland Email tero.isotalo@tut.fi Jukka Lempiainen Institute of Communications Engineering Tampere University of Technology P.O. BOX 553 33101 Tampere Finland Email jukka.lempiainen@tut.fi Received 3 January 2005 Revised 12 May 2005 Recommended for Publication by Pascal Chevalier The impact of antenna downtilt on the performance of cellular WCDMA network has been studied by using a radio network planning tool. An optimum downtilt angle has been evaluated for numerous practical macrocellular site and antenna configurations for electrical and mechanical antenna downtilt concepts. The aim of this massive simulation campaign was expected to provide an answer to two questions firstly how to select the downtilt angle of a macrocellular base station antenna Secondly what is the impact of antenna downtilt on system capacity and network coverage Optimum downtilt angles were observed to vary between 3.5 -10.5 depending on the network configuration. Moreover the corresponding downlink capacity gains varied between 0-58 . Antenna vertical beamwidth affects clearly the required optimum downtilt angle the most. On the other hand with wider antenna vertical beamwidth the impact of downtilt on system performance is not such imposing. In addition antenna height together with the size of the dominance area affect the required downtilt angle. Finally the simulation results revealed how the importance of the antenna downtilt becomes more significant in dense networks where the capacity requirements are typically also higher. Keywords and phrases electrical downtilt .
