Analysis of mimo antenna configuration effects on Wimax Network deployment in Ghana
Loading...
Date
2015-07-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Worldwide Interoperability for Microwave Access (WiMAX) technology has
gained growing interest due to its applications and advantages. It is fast emerging
as a last-mile problem solution for broadband access technology. This thesis
presents operational scenarios for the deployment of a Fourth Generation (4G)
WiMAX system in a typical Sub-Saharan African environment. The work
in this research has been specified based on real world conditions considering
the regulatory rules stipulated by the National Communication Authority for
radio frequency spectrum utilization in the 2.6GHz licensed band in Ghana.
Appropriate propagation models and network planning tools have been used to
design the optimized final radio network plan for the various Multi-Input Multi-
Output (MIMO) configurations.
A parameter called Interference to Noise Ratio (INR) was introduced to optimize
the BER performance of the deployed 2x2 MIMO configuration in the presence of
multiple interferers. The INR parameter was used to fit the BER results and then
subsequently optimize the 2x2 MIMO configuration performance in the striped
case to create a wide virtual bandwidth. The fitting INR parameter helped to
improve the BER performance once the threshold INR was exceeded. This result
extends the principle of successive decoding to MIMO systems affected by partial
band interference under the assumption of a common receive correlation matrix.
Unsuppressed sidelobe emissions also distort the performance of MIMO antenna
systems used in deploying multicarrier networks. In order to accurately
evaluate the performance of the MIMO antenna configurations used in the
network deployment scenario, a mathematical model for estimating the effective
beamwidth and sidelobe suppression factors for MIMO antenna systems used
in multicarrier deployment scenarios was developed. The derived step function
can be used to minimize the effect of antenna sidelobe emission in a realistic
iii
deployment scenario and also as an operational guideline tool to model added
isolation factors. This function may provide a means to determine practical
antenna sidelobe suppression factors in subsequent WiMAX deployments.
Coverage, capacity, and interference predictions have been performed using
MATLAB, 4-NEC 2 and Genex-U-Net for the predefined areas of Accra and Tema,
Ghana. Simulation results for different downlink/uplink ratios with different
frequency reuse schemes and antenna configurations have been presented. A
total of 11 base stations have been suggested to provide coverage of -92dBm
using 32 sectors adaptive 4x4 MIMO antenna configuration to provide a 3dB
gain over the deployed adaptive 2x2 MIMO system thereby reducing deployment
cost. Finally, based on the high system performance of the evaluated network,
secure communication models and network architectures have been proposed in
three case study areas.
Keywords: Performance Evaluation; Capacity Simulation; Interference Modeling;
WiMAX Radio Planning; Successive Cancellation Technique.
Description
A thesis submitted to the Department of Electrical
Engineering, Kwame Nkrumah University Of Science And
Technology in partial fufillment of the requirement
for the degree of Doctor Of Philosophy in
Telecommunications Engineering.