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: System-Level Performance of Antenna Arrays in CDMA-Based Cellular Mobile Radio Systems Andreas Czylwik | EURASIP Journal on Applied Signal Processing 2004 9 1308-1320 2004 Hindawi Publishing Corporation System-Level Performance of Antenna Arrays in CDMA-Based Cellular Mobile Radio Systems Andreas Czylwik Department of Communication Systems University Duisburg-Essen 47057 Duisburg Germany Em ail czylwik@ Armin Dekorsy Lucent Technologies GmbH Bell Labs Innovations 90411 Nuremberg Germany Email dekorsy@ Received 23 June 2003 Revised 1 March 2004 Smart antennas exploit the inherent spatial diversity of the mobile radio channel provide an antenna gain and also enable spatial interference suppression leading to reduced intracell as well as intercell interference. Especially for the downlink of future CDMAbased mobile communications systems transmit beamforming is seen as a well-promising smart antenna technique. The main objective of this paper is to study the performance of diverse antenna array topologies when applied for transmit beamforming in the downlink of CDMA-based networks. In this paper we focus on uniform linear array ULA and uniform circular array UCA topologies. For the ULA we consider three-sector base stations with one linear array per sector. While recent research on downlink beamforming is often restricted to one single cell this study takes into account the important impact of intercell interference on the performance by evaluating complete networks. Especially from the operator perspective system capacity and system coverage are very essential parameters of a cellular system so that there is a clear necessity of intensive system level investigations. Apart from delivering assessments on the performance of the diverse antenna array topologies in the paper also different antenna array parameters such as element spacing and beamwidth of the sector antennas are optimized. Although we focus on the network level fast channel fluctuations are taken into account by including them analytically into the signal-to-interference .
