Quality of service (QoS) is a key performance indicator (KPI) that is used in determining the efficiency of telecommunication services rendered to end users. Accessibility, connection quality and retainability are major factors used in evaluating quality of service of a network provider. For consumers, it is expected that maximum satisfaction is to be derived from any services paid for. This maximum satisfaction has now become a difficult task to achieve in the Global System for Mobile communication (GSM) industry. Congestion in network channels contributes greatly to QoS of any network which the provider needs good resource management. One of the major problems affecting the capacity of Wideband Code Division Multiple Access (WCDMA) is interference. WCDMA cellular mobile systems has widespread acceptance particularly in regional centers where there are large geographical areas to cover. However, temporal changes of user density due to formation of congregated population centers (called hot spots) can seriously undermine the system design goals in terms of quality of service and system capacity. This paper presents focuses on reducing cochannel interference problems with the application of adaptive sectorization which increases the capacity of WCDMA by reducing interference through increase in number of cell sectors. This is achieved through modification of the number of antennas to be used in an array at a base station and determination of amount of energy leaked between users as well as the radiation pattern for the three mobile devices with a measure of the interference between them. Result shows a desirable reduction in the amplitude of the bars off the diagonal when more antennas are used and how the beams in the radiation patterns are also narrower. From set value of the experiment cell radius, R = 1km, Reverse Link (SIR th ) = 13.6dB, Number of Sector N = 12, the antenna array study from the base station (BS) increase, changes the beam pattern at different orientations Angle, with an increment of energy used as the angle tends to 90 o in SIR with angle ? ranging from 30 ? ,60 ? ,to 90 ? with a significant reduction of SIR when the number is increased to 25, SIR were -15.19, -13.91and 13.30 for 30 ? ,60 ? ,to 90 ? respectively. At the expense of the path shadow loss, the difference between the set values appreciate by 0.02dB at N= 10 instead of the set value N = 12. It is found that in all situations the adaptive sectorization brings an overall improvement to system capacity and this is particularly significant when the user concentration in hot spots is substantially larger than that of the rest of the cell.
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