With the increasing demand for mobile data services, Broadband WirelessAccess (BWA) is emerging as one of the fastest growing areas within mobilecommunications. Innovative wireless communication systems, such as WiMAX, areexpected to offer highly reliable broadband radio access in order to meet theincreasing demands of emerging high speed data and multimedia services. InGhana, deployment of WiMAX technology has recently begun. Planning these highcapacity networks in the presence of multiple interferences in order to achievethe aim of enabling users enjoy cheap and reliable internet services is acritical design issue. This paper has used a deterministic approach forsimulating the Bit-Error-Rate (BER) of initial MIMO antenna configurationswhich were considered in deploying a high capacity 4G-WiMAX network in Ghana.The radiation pattern of the antenna used in the deploying the network has beensimulated with Genex-Unet and NEC and results presented. An adaptive 4x4 MIMOantenna configuration with optimally suppressed sidelobes has been suggestedfor future network deployment since the adaptive 2x2 MIMO antennaconfiguration, which was used in the initial network deployment provides poorestimates for average BER performance as compared to 4x4 antenna configurationwhich seem less affected in the presence of multiple interferers.
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