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 (SIRth) = -
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 90o in SIR with angle π ranging
from 30π
,60π
,to 90π with a significant reduction of SIR when the number is increased to 25, SIR were -15.19, -13.91and -
13.30 for 30π
,60π
,to 90π
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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